Engineering Failure Analysis最新文献_第3页

Failure analysis of utility poles: a review of material deficiencies, environmental effects, structural performance, assessment techniques, and design considerations 电线杆失效分析：回顾材料缺陷、环境影响、结构性能、评估技术和设计考虑

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-09 DOI: 10.1016/j.engfailanal.2025.110525

Ahmed I. Elmetwally , El-Sayed Abd-Elaal , Xing Ma , Raufdeen Rameezdeen , Raju Upadhyaya

Utility poles are the backbone of the electricity grid and a key enabler of a carbon–neutral economy, as they connect renewable sources like solar energy to homes and businesses. The number of such utility poles in each country is huge, and so is a significant infrastructure value. In Australia, for example, the current network consists of approximately 7 million utility poles made from wood, concrete, steel, steel–concrete composite, or fibre-reinforced polymer (FRP). While the current grid plans normally do not aim to increase this number of poles, as underground grids are more effective, replacing the current poles with underground assets is cost-prohibitive. So, there is a need to hold these poles in use and continuously replace the aged ones with new, durable poles. This study presents a comprehensive review of failure analysis for different types of poles. The failures can be grouped into three main categories: material-related problems, environmental degradation, and structural response, including cyclic load effects. Understanding these failure categories is important for explaining how poles behave over time and for planning proper maintenance or replacement strategies. It is concluded that future research should prioritise accelerated ageing studies (e.g., the relation between observed degradation and remaining structural capacity). Furthermore, the optimum pole type varies depending on factors such as capital investment, workforce experience, material availability, structural loads, environmental exposure, maintenance demands and associated costs. Lastly, assessment techniques, selection criteria, design considerations and future research directions are outlined.

电线杆是电网的支柱，是碳中和经济的关键推动者，因为它们将太阳能等可再生能源连接到家庭和企业。在每个国家，这样的电线杆的数量都是巨大的，因此具有重要的基础设施价值。例如，在澳大利亚，目前的网络由大约700万个电线杆组成，电线杆由木材、混凝土、钢、钢-混凝土复合材料或纤维增强聚合物（FRP）制成。虽然目前的电网计划通常不打算增加电线杆的数量，因为地下电网更有效，但用地下资产取代现有的电线杆成本过高。因此，有必要保持这些杆子的使用，并不断地用新的、耐用的杆子替换旧的。本文对不同类型电杆的失效分析进行了综述。失效可分为三大类：材料相关问题、环境退化和结构响应，包括循环荷载效应。了解这些故障类别对于解释电线杆随时间的变化以及制定适当的维护或更换策略非常重要。结论是，未来的研究应优先考虑加速老化研究（例如，观察到的退化与剩余结构能力之间的关系）。此外，最佳的电线杆类型取决于资本投资、劳动力经验、材料可用性、结构负载、环境暴露、维护需求和相关成本等因素。最后，对评价技术、选择标准、设计考虑和未来研究方向进行了概述。

{"title":"Failure analysis of utility poles: a review of material deficiencies, environmental effects, structural performance, assessment techniques, and design considerations","authors":"Ahmed I. Elmetwally , El-Sayed Abd-Elaal , Xing Ma , Raufdeen Rameezdeen , Raju Upadhyaya","doi":"10.1016/j.engfailanal.2025.110525","DOIUrl":"10.1016/j.engfailanal.2025.110525","url":null,"abstract":"<div><div>Utility poles are the backbone of the electricity grid and a key enabler of a carbon–neutral economy, as they connect renewable sources like solar energy to homes and businesses. The number of such utility poles in each country is huge, and so is a significant infrastructure value. In Australia, for example, the current network consists of approximately 7 million utility poles made from wood, concrete, steel, steel–concrete composite, or fibre-reinforced polymer (FRP). While the current grid plans normally do not aim to increase this number of poles, as underground grids are more effective, replacing the current poles with underground assets is cost-prohibitive. So, there is a need to hold these poles in use and continuously replace the aged ones with new, durable poles. This study presents a comprehensive review of failure analysis for different types of poles. The failures can be grouped into three main categories: material-related problems, environmental degradation, and structural response, including cyclic load effects. Understanding these failure categories is important for explaining how poles behave over time and for planning proper maintenance or replacement strategies. It is concluded that future research should prioritise accelerated ageing studies (e.g., the relation between observed degradation and remaining structural capacity). Furthermore, the optimum pole type varies depending on factors such as capital investment, workforce experience, material availability, structural loads, environmental exposure, maintenance demands and associated costs. Lastly, assessment techniques, selection criteria, design considerations and future research directions are outlined.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"186 ","pages":"Article 110525"},"PeriodicalIF":5.7,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145972782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probabilistic failure modeling of seismic-induced misalignment in overhead catenary systems on high-speed railway bridges 高速铁路桥梁接触网系统地震致失中概率破坏模型

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-09 DOI: 10.1016/j.engfailanal.2026.110560

Yong-heng Mao , Chang He , Wei Guo , Li-zhong Jiang

Post-earthquake residual misalignment in overhead catenary systems (OCS) installed on high-speed railway bridges can critically impair the power transmission capability of the pantograph-catenary interface, resulting in functional failure of the train’s current collection system. This study investigates the seismic-induced failure mechanism of OCS components from a system-level perspective, focusing on quantifying and predicting residual displacements beyond design tolerances. A physically constrained, data-driven probabilistic modeling framework is proposed to evaluate OCS misalignment under multiple sources of uncertainty, including seismic intensity, bridge damage severity, and structural configuration. To achieve this, a bridge–catenary decoupling modeling strategy is developed to efficiently simulate the transfer of post-earthquake displacement from the bridge to the catenary system across various pier heights and span layouts. The transfer effect is quantitatively described using the first-order Wasserstein distance. A large-scale residual displacement database is constructed, and extreme value distribution fitting reveals that the Gumbel distribution consistently outperforms alternatives across seismic intensity levels. Its parameters are modeled as cubic functions of peak ground acceleration, enabling a Monte Carlo-based kernel density estimation (KDE) to rapidly obtain failure probability distributions. Results show that, in the worst-case configurations, the predicted P95 residual misalignment exceeds the 10 mm functional criterion by more than an order of magnitude. This research provides new insight into the probabilistic failure behavior of catenary systems under seismic excitation and offers a physically interpretable, computationally efficient tool for rapid post-earthquake damage assessment and failure risk ranking in electrified railway infrastructure.

高速铁路桥梁架空接触网系统（OCS）的震后残留失对会严重影响受电弓-接触网界面的输电能力，导致列车电流采集系统的功能失效。本研究从系统层面的角度研究了OCS构件的地震破坏机制，重点是量化和预测超出设计公差的剩余位移。提出了一种物理约束、数据驱动的概率建模框架，用于评估地震烈度、桥梁损伤严重程度和结构配置等多种不确定性来源下的OCS错位。为了实现这一目标，开发了一种桥梁-悬链线解耦建模策略，以有效地模拟震后位移在不同桥墩高度和跨径布置下从桥梁到悬链线系统的传递。用一阶沃瑟斯坦距离定量描述了传递效应。建立了大规模的剩余位移数据库，极值分布拟合表明，在地震烈度水平上，Gumbel分布始终优于替代分布。它的参数被建模为峰值地面加速度的三次函数，使得基于蒙特卡罗的核密度估计（KDE）能够快速获得失效概率分布。结果表明，在最坏情况下，预测的P95残余偏差超过10 mm功能准则一个数量级以上。该研究为地震激励下接触网系统的概率破坏行为提供了新的见解，并为电气化铁路基础设施的地震后快速损伤评估和失效风险排序提供了一个物理上可解释的、计算效率高的工具。

{"title":"Probabilistic failure modeling of seismic-induced misalignment in overhead catenary systems on high-speed railway bridges","authors":"Yong-heng Mao , Chang He , Wei Guo , Li-zhong Jiang","doi":"10.1016/j.engfailanal.2026.110560","DOIUrl":"10.1016/j.engfailanal.2026.110560","url":null,"abstract":"<div><div>Post-earthquake residual misalignment in overhead catenary systems (OCS) installed on high-speed railway bridges can critically impair the power transmission capability of the pantograph-catenary interface, resulting in functional failure of the train’s current collection system. This study investigates the seismic-induced failure mechanism of OCS components from a system-level perspective, focusing on quantifying and predicting residual displacements beyond design tolerances. A physically constrained, data-driven probabilistic modeling framework is proposed to evaluate OCS misalignment under multiple sources of uncertainty, including seismic intensity, bridge damage severity, and structural configuration. To achieve this, a bridge–catenary decoupling modeling strategy is developed to efficiently simulate the transfer of post-earthquake displacement from the bridge to the catenary system across various pier heights and span layouts. The transfer effect is quantitatively described using the first-order Wasserstein distance. A large-scale residual displacement database is constructed, and extreme value distribution fitting reveals that the Gumbel distribution consistently outperforms alternatives across seismic intensity levels. Its parameters are modeled as cubic functions of peak ground acceleration, enabling a Monte Carlo-based kernel density estimation (KDE) to rapidly obtain failure probability distributions. Results show that, in the worst-case configurations, the predicted P95 residual misalignment exceeds the 10 mm functional criterion by more than an order of magnitude. This research provides new insight into the probabilistic failure behavior of catenary systems under seismic excitation and offers a physically interpretable, computationally efficient tool for rapid post-earthquake damage assessment and failure risk ranking in electrified railway infrastructure.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"186 ","pages":"Article 110560"},"PeriodicalIF":5.7,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The optimum upgrade in the flexural capacity of heat-damaged one-way RC slabs strengthened with anchored CFRP sheets 锚固碳纤维布加固热损伤单向RC板抗弯承载力的优化提升

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-08 DOI: 10.1016/j.engfailanal.2026.110558

Rajai Z. Al-Rousan, Bara’a R. Alnemrawi

This study highlights the effect of strengthening heat-damaged reinforced concrete (RC) slabs with carbon fiber reinforced polymers (CFRP) sheets, which were anchored at their ends to enhance their performance and prevent brittle debonding failure. The efficiency of the anchoring system was examined using a total of twenty-four specimens tested under the effect of different slab depths (60, 80, and 100) mm, temperatures (23, 200, 400, and 600)

^{°}

C, and the CFRF anchoring system (anchored and unanchored). Results show that the structural behavior is significantly improved upon the anchoring, including all its characteristics, and the enhancement extent is directly related to the higher benefit from the CFRP high tensile strength, where the final failure was delayed without premature early debonding or delamination. However, the failure mode, cracking patterns, and the resulting improvement by the CFRP strengthening efficiency mainly depend on the damage level. Increasing the exposure temperature for heat-damaged specimens resulted in increasing the crack-bridging ability provided by the CFRP strengthening material. Finally, results revealed that the efficiency of the anchored CFRP composites increased by 13% to 33% which ends up with improving the strength, ductility, and durability of the heat-damaged RC slabs.

本研究强调了用碳纤维增强聚合物（CFRP）板加固热损伤钢筋混凝土（RC）板的效果，碳纤维增强聚合物（CFRP）板在其末端锚固以提高其性能并防止脆性脱粘破坏。在不同板深（60、80和100）mm、温度（23、200、400和600）°C以及CFRF锚固系统（锚定和非锚定）的影响下，共测试了24个试件，以检验锚固系统的效率。结果表明：锚固后结构性能得到显著改善，包括其所有特性，其改善程度与CFRP高抗拉强度的较高效益直接相关，CFRP高抗拉强度延迟了最终破坏，没有过早的早期脱粘或分层。然而，破坏模式、开裂模式以及碳纤维布加固效率的提高主要取决于损伤程度。提高热损伤试件的暴露温度，CFRP增强材料提供的裂缝弥合能力增强。结果表明，锚固CFRP复合材料的效率提高了13%至33%，最终提高了热损伤RC板的强度、延性和耐久性。

{"title":"The optimum upgrade in the flexural capacity of heat-damaged one-way RC slabs strengthened with anchored CFRP sheets","authors":"Rajai Z. Al-Rousan, Bara’a R. Alnemrawi","doi":"10.1016/j.engfailanal.2026.110558","DOIUrl":"10.1016/j.engfailanal.2026.110558","url":null,"abstract":"<div><div>This study highlights the effect of strengthening heat-damaged reinforced concrete (RC) slabs with carbon fiber reinforced polymers (CFRP) sheets, which were anchored at their ends to enhance their performance and prevent brittle debonding failure. The efficiency of the anchoring system was examined using a total of twenty-four specimens tested under the effect of different slab depths (60, 80, and 100) mm, temperatures (23, 200, 400, and 600)<span><math><mrow><msup><mrow><mspace></mspace></mrow><mo>°</mo></msup></mrow></math></span> C, and the CFRF anchoring system (anchored and unanchored). Results show that the structural behavior is significantly improved upon the anchoring, including all its characteristics, and the enhancement extent is directly related to the higher benefit from the CFRP high tensile strength, where the final failure was delayed without premature early debonding or delamination. However, the failure mode, cracking patterns, and the resulting improvement by the CFRP strengthening efficiency mainly depend on the damage level. Increasing the exposure temperature for heat-damaged specimens resulted in increasing the crack-bridging ability provided by the CFRP strengthening material. Finally, results revealed that the efficiency of the anchored CFRP composites increased by 13% to 33% which ends up with improving the strength, ductility, and durability of the heat-damaged RC slabs.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"186 ","pages":"Article 110558"},"PeriodicalIF":5.7,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145921731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Accelerated failure characterization and reliability analysis of cylindrical electrical connectors under wind vibration environments 风振环境下圆柱形电连接器加速失效特性及可靠性分析

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-08 DOI: 10.1016/j.engfailanal.2026.110562

Jinye Wang , Yu Feng , Kai Wu , Shaolei Wu , Wei Wang

Electrical connectors are electrical devices used for branching and connecting conductors in power distribution lines. Under wind loads, they undergo sustained vortex-induced periodic vibrations along with the conductors, causing fatigue and wear at the electrical contact interface and thereby reducing the reliability of electrical connections. This study selected cylindrical electrical connectors as the research subject. A constant-stress accelerated degradation test protocol was designed, employing vibration velocity as the accelerated stress and contact resistance as the performance degradation indicator. By analyzing the contact resistance variation curve and contact interface damage assessment, the failure mechanism of electrical connectors under vibrational environments was revealed, fully accounting for time-varying differences between the specimen and the degradation process. A nonlinear accelerated degradation model incorporating random effects was established, with model parameters solved using an iterative maximum likelihood estimation method. Based on this model, failure probability density curves and reliability curves for electrical connectors were plotted. By evaluating curve variations and extrema, the reliability of electrical connectors was assessed and their service life predicted, providing a robust theoretical foundation for maintenance strategies in power distribution networks.

电连接器是配电线路中用于分支和连接导体的电气装置。在风荷载下，它们与导体一起经历持续的涡激周期性振动，导致电接触界面疲劳和磨损，从而降低了电气连接的可靠性。本研究选择圆柱形电连接器作为研究对象。以振动速度为加速应力，接触阻力为性能退化指标，设计了恒应力加速退化试验方案。通过接触电阻变化曲线分析和接触界面损伤评估，揭示了电连接器在振动环境下的失效机理，充分考虑了试样与降解过程的时变差异。建立了考虑随机效应的非线性加速退化模型，采用迭代极大似然估计法求解模型参数。在此基础上，绘制了电连接器的失效概率密度曲线和可靠性曲线。通过对曲线变化和极值的评估，对电连接器的可靠性进行了评估，并对其寿命进行了预测，为配电网的维护策略提供了有力的理论依据。

{"title":"Accelerated failure characterization and reliability analysis of cylindrical electrical connectors under wind vibration environments","authors":"Jinye Wang , Yu Feng , Kai Wu , Shaolei Wu , Wei Wang","doi":"10.1016/j.engfailanal.2026.110562","DOIUrl":"10.1016/j.engfailanal.2026.110562","url":null,"abstract":"<div><div>Electrical connectors are electrical devices used for branching and connecting conductors in power distribution lines. Under wind loads, they undergo sustained vortex-induced periodic vibrations along with the conductors, causing fatigue and wear at the electrical contact interface and thereby reducing the reliability of electrical connections. This study selected cylindrical electrical connectors as the research subject. A constant-stress accelerated degradation test protocol was designed, employing vibration velocity as the accelerated stress and contact resistance as the performance degradation indicator. By analyzing the contact resistance variation curve and contact interface damage assessment, the failure mechanism of electrical connectors under vibrational environments was revealed, fully accounting for time-varying differences between the specimen and the degradation process. A nonlinear accelerated degradation model incorporating random effects was established, with model parameters solved using an iterative maximum likelihood estimation method. Based on this model, failure probability density curves and reliability curves for electrical connectors were plotted. By evaluating curve variations and extrema, the reliability of electrical connectors was assessed and their service life predicted, providing a robust theoretical foundation for maintenance strategies in power distribution networks.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"186 ","pages":"Article 110562"},"PeriodicalIF":5.7,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel event‑driven impact signal model for deep groove ball bearings with inner‑race defects 具有内圈缺陷的深沟球轴承事件驱动冲击信号模型

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-08 DOI: 10.1016/j.engfailanal.2026.110559

Jiqiao Li , Zhifeng Shi , Yongqiao Wei , Hua Huang , Changfeng Yan , Xinbin Li , Yajun Xu , Jing Liu

Vibration impact signals are pivotal for quantifying defect sizes in deep groove ball (DGB) bearings. However, conventional dynamic models often produce oversimplified responses that lack the characteristic impulses observed in test signals, primarily because they neglect the nuanced sequence of events during rolling element-defect interactions. To bridge this fidelity gap, this paper proposes a novel event-driven signal model that, based on the inner-race displacement under different bearing load conditions, for the first time deconstructs the rolling element’s passage through an inner-race defect into three distinct physical phases: stress relief, first impact, and second impact. By calculating the time-varying load distribution and contact state transitions associated with each phase, the model synthesizes highly realistic impact impulses without relying on any resonance parameters, setting it apart from existing approaches. The key advantages of this model are its parametric simplicity, computational efficiency, and exceptional phase accuracy, enabling it to faithfully restore the transient impulse train. Experimental validation demonstrates remarkable consistency with test data. Furthermore, the model provides a clear analytical framework to investigate the influence of defect size and rotational speed on each impact event, offering profound insights for precise defect size evaluation and advancing the state-of-the-art in bearing fault simulation.

振动冲击信号是深沟球（DGB）轴承缺陷尺寸量化的关键。然而，传统的动态模型往往产生过于简化的响应，缺乏在测试信号中观察到的特征脉冲，主要是因为它们忽略了滚动元件-缺陷相互作用过程中细微的事件序列。为了弥补这一保真度差距，本文提出了一种新的事件驱动信号模型，该模型基于不同轴承载荷条件下的内圈位移，首次将滚动体通过内圈缺陷的过程分解为三个不同的物理阶段：应力释放、第一次冲击和第二次冲击。通过计算与各相位相关的时变载荷分布和接触状态转换，该模型在不依赖任何共振参数的情况下合成了高度真实的冲击脉冲，与现有方法不同。该模型的主要优点是参数简单，计算效率高，相位精度高，能够忠实地恢复瞬态脉冲序列。实验验证与试验数据具有显著的一致性。此外，该模型提供了一个清晰的分析框架来研究缺陷尺寸和转速对每个冲击事件的影响，为精确评估缺陷尺寸提供了深刻的见解，并推动了轴承故障模拟的最新发展。

{"title":"A novel event‑driven impact signal model for deep groove ball bearings with inner‑race defects","authors":"Jiqiao Li , Zhifeng Shi , Yongqiao Wei , Hua Huang , Changfeng Yan , Xinbin Li , Yajun Xu , Jing Liu","doi":"10.1016/j.engfailanal.2026.110559","DOIUrl":"10.1016/j.engfailanal.2026.110559","url":null,"abstract":"<div><div>Vibration impact signals are pivotal for quantifying defect sizes in deep groove ball (DGB) bearings. However, conventional dynamic models often produce oversimplified responses that lack the characteristic impulses observed in test signals, primarily because they neglect the nuanced sequence of events during rolling element-defect interactions. To bridge this fidelity gap, this paper proposes a novel event-driven signal model that, based on the inner-race displacement under different bearing load conditions, for the first time deconstructs the rolling element’s passage through an inner-race defect into three distinct physical phases: stress relief, first impact, and second impact. By calculating the time-varying load distribution and contact state transitions associated with each phase, the model synthesizes highly realistic impact impulses without relying on any resonance parameters, setting it apart from existing approaches. The key advantages of this model are its parametric simplicity, computational efficiency, and exceptional phase accuracy, enabling it to faithfully restore the transient impulse train. Experimental validation demonstrates remarkable consistency with test data. Furthermore, the model provides a clear analytical framework to investigate the influence of defect size and rotational speed on each impact event, offering profound insights for precise defect size evaluation and advancing the state-of-the-art in bearing fault simulation.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"186 ","pages":"Article 110559"},"PeriodicalIF":5.7,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145921729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of perforated friction block design on the tribological behavior of high-speed train brake interfaces under different ambient temperatures 不同环境温度下，穿孔摩擦块设计对高速列车制动界面摩擦学性能的影响

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-08 DOI: 10.1016/j.engfailanal.2026.110555

Qixiang Zhang , Zhou Yu , Meng Wu , Xiaocui Wang , Jiliang Mo

To elucidate the influence of the perforation structure on the tribological characteristics of high-speed train brake interfaces, solid (ST) and perforated (PT) triangular friction blocks were investigated under room (20 °C) and low (−20 °C) temperatures. By combining braking bench tests with a temperature-displacement-wear coupled finite element (FE) model, the synergistic effects of ambient temperature and friction block geometry were systematically analyzed. Results show that low temperatures significantly increase the hardness and brittleness of the friction material, leading to severe abrasive wear and intensified high-frequency noise. However, the perforated design is found to effectively regulate interfacial behavior by improving contact stress distribution and facilitating debris removal. This structure mitigates the uneven wear and vibration instabilities typically exacerbated by cold environments. This study reveals the synergistic mechanism by which ambient temperature and perforation geometry regulate braking tribological behavior, providing theoretical support for structural optimization and reliable operation of high-speed train brake systems in complex environments.

为了阐明穿孔结构对高速列车制动界面摩擦学特性的影响，在室温（20°C）和低温（- 20°C）下研究了固体（ST）和穿孔（PT）三角形摩擦块。通过将制动台架试验与温度-位移-磨损耦合有限元模型相结合，系统分析了环境温度与摩擦块几何形状的协同效应。结果表明：低温显著提高了摩擦材料的硬度和脆性，导致磨粒磨损严重，高频噪声加剧；然而，研究发现，通过改善接触应力分布和促进碎屑清除，穿孔设计有效地调节了界面行为。这种结构减轻了通常在寒冷环境下加剧的不均匀磨损和振动不稳定。研究揭示了环境温度和孔眼几何形状对制动摩擦学行为的协同调节机制，为复杂环境下高速列车制动系统的结构优化和可靠运行提供了理论支持。

{"title":"Effect of perforated friction block design on the tribological behavior of high-speed train brake interfaces under different ambient temperatures","authors":"Qixiang Zhang , Zhou Yu , Meng Wu , Xiaocui Wang , Jiliang Mo","doi":"10.1016/j.engfailanal.2026.110555","DOIUrl":"10.1016/j.engfailanal.2026.110555","url":null,"abstract":"<div><div>To elucidate the influence of the perforation structure on the tribological characteristics of high-speed train brake interfaces, solid (ST) and perforated (PT) triangular friction blocks were investigated under room (20 °C) and low (−20 °C) temperatures. By combining braking bench tests with a temperature-displacement-wear coupled finite element (FE) model, the synergistic effects of ambient temperature and friction block geometry were systematically analyzed. Results show that low temperatures significantly increase the hardness and brittleness of the friction material, leading to severe abrasive wear and intensified high-frequency noise. However, the perforated design is found to effectively regulate interfacial behavior by improving contact stress distribution and facilitating debris removal. This structure mitigates the uneven wear and vibration instabilities typically exacerbated by cold environments. This study reveals the synergistic mechanism by which ambient temperature and perforation geometry regulate braking tribological behavior, providing theoretical support for structural optimization and reliable operation of high-speed train brake systems in complex environments.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"186 ","pages":"Article 110555"},"PeriodicalIF":5.7,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructural degradation and creep damage of T91 steel: a case study of fish-mouth rupture in heat recovery steam generator superheater tubes T91钢的显微组织退化与蠕变损伤——以热回收蒸汽发生器过热器管鱼口断裂为例

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-07 DOI: 10.1016/j.engfailanal.2026.110554

Atef Zekri , Jonas Da Silva De Sa , Akshath Raghu Shetty , Kamal Mroue , Abdelmajid Salhi , Brahim Aissa , Said Mansour

This study offers a multi-scale investigation into the creep rupture of a Grade T91 Cr-Mo steel superheater tube from a Heat Recovery Steam Generator (HRSG) that experienced a catastrophic fish-mouth fracture after prolonged service. Unlike conventional case studies that rely on a single analytical technique, this research combines optical microscopy, scanning electron microscopy (SEM/EDS), atomic force microscopy (AFM), X-ray diffraction (XRD), and hardness profiling on the same failed component. This method allows a direct link between nanoscale features and large-scale fracture behaviour. Findings reveal progressive carbide spheroidization, boundary segregation of (Cr, Mo)-rich precipitates, and intergranular void formation, along with oxide scale thickening that led to increased localised overheating. These observations are consistent with established tertiary-creep degradation mechanisms reported for T91 steels. AFM analysis was used to characterise surface topography and grain-boundary relief associated with creep damage, complementing conventional microscopy techniques. The combined hardness reduction and phase analysis confirms tertiary creep rupture as the primary failure mode, aggravated by internal oxidation and localised wall thinning. Key features of this failure include a pronounced fish-mouth rupture geometry, of sulphur and chlorine detected on the steam-side surface, and the comparative chemistry of inner and outer oxide scales. This comprehensive approach not only clarifies the combined effects of creep and oxidation in T91 failures but also underscores the diagnostic value of integrating nanoscale AFM with traditional metallurgical techniques for service-life prediction and failure prevention in high-temperature power plant components.

本研究对热回收蒸汽发生器（HRSG）的T91级Cr-Mo钢过热器管进行了多尺度蠕变断裂研究，该过热器管在长期使用后发生了灾难性的鱼嘴断裂。与依赖单一分析技术的传统案例研究不同，该研究结合了光学显微镜、扫描电子显微镜（SEM/EDS）、原子力显微镜（AFM）、x射线衍射（XRD）和硬度分析对同一失效部件进行分析。这种方法可以将纳米尺度特征与大规模断裂行为直接联系起来。结果表明，碳化物球化、富（Cr, Mo）析出相边界偏析、晶间空洞形成，以及氧化层增厚导致局部过热加剧。这些观察结果与T91钢的三级蠕变降解机制一致。AFM分析用于表征与蠕变损伤相关的表面形貌和晶界起伏，补充了传统的显微镜技术。硬度降低和相分析证实三级蠕变破裂是主要的破坏模式，内部氧化和局部壁薄加剧了破坏模式。该故障的主要特征包括明显的鱼嘴破裂几何形状，在蒸汽侧表面检测到硫和氯，以及内部和外部氧化物鳞片的比较化学性质。这一综合方法不仅阐明了蠕变和氧化对T91失效的综合影响，而且强调了将纳米尺度原子力显微镜与传统冶金技术相结合，在高温电厂部件的使用寿命预测和失效预防方面的诊断价值。

{"title":"Microstructural degradation and creep damage of T91 steel: a case study of fish-mouth rupture in heat recovery steam generator superheater tubes","authors":"Atef Zekri , Jonas Da Silva De Sa , Akshath Raghu Shetty , Kamal Mroue , Abdelmajid Salhi , Brahim Aissa , Said Mansour","doi":"10.1016/j.engfailanal.2026.110554","DOIUrl":"10.1016/j.engfailanal.2026.110554","url":null,"abstract":"<div><div>This study offers a multi-scale investigation into the creep rupture of a Grade T91 Cr-Mo steel superheater tube from a Heat Recovery Steam Generator (HRSG) that experienced a catastrophic fish-mouth fracture after prolonged service. Unlike conventional case studies that rely on a single analytical technique, this research combines optical microscopy, scanning electron microscopy (SEM/EDS), atomic force microscopy (AFM), X-ray diffraction (XRD), and hardness profiling on the same failed component. This method allows a direct link between nanoscale features and large-scale fracture behaviour. Findings reveal progressive carbide spheroidization, boundary segregation of (Cr, Mo)-rich precipitates, and intergranular void formation, along with oxide scale thickening that led to increased localised overheating. These observations are consistent with established tertiary-creep degradation mechanisms reported for T91 steels. AFM analysis was used to characterise surface topography and grain-boundary relief associated with creep damage, complementing conventional microscopy techniques. The combined hardness reduction and phase analysis confirms tertiary creep rupture as the primary failure mode, aggravated by internal oxidation and localised wall thinning. Key features of this failure include a pronounced fish-mouth rupture geometry, of sulphur and chlorine detected on the steam-side surface, and the comparative chemistry of inner and outer oxide scales. This comprehensive approach not only clarifies the combined effects of creep and oxidation in T91 failures but also underscores the diagnostic value of integrating nanoscale AFM with traditional metallurgical techniques for service-life prediction and failure prevention in high-temperature power plant components.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"186 ","pages":"Article 110554"},"PeriodicalIF":5.7,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145921364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on multi-scale mechanism and unclogging technology of granular particles adhesion hang-up in high ore pass 高溜井颗粒黏附悬吊多尺度机理及疏通技术研究

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-07 DOI: 10.1016/j.engfailanal.2026.110556

Yu Xiong , Lichun Jiang , Fei Li , Zhanglong Liu , Zhi Yang

To address the problem of granular particles adhesion hang-up in high ore passes, this study combines field investigation, particle size statistics, and the characterization of inter-particle adhesive mechanics. Through a multi-scale analysis that couples micro-agglomeration mechanism and macro-blocking conditions, it reveals the fundamental mechanical essence of ore pass hang-up. Furthermore, the efficient unclogging technology is put forward, and the engineering application is completed. The results show that the mechanical behavior of contact and adhesion of granular particles is significantly controlled by particle gradation, and the normal contact force F_n, tangential contact force F_s and capillary bridge force F_c all increase with the increase of particle size, among which the sharp increase of F_n, F_s and F_c under similar particle size combinations is the core inducement of hang-up. The contact angle ϕ and particle grading serve as coordinated control parameters for adhesive balance. Vertical (ϕ = 90°) and horizontal (ϕ = 0°) contact lead to the failure of normal and tangential adhesive due to the disparity of particle weight and particle size, respectively. Fine particles are prone to persistent hang-up due to agglomeration, rendering adjustments to ore pass diameter D, inclination α and granular height H in a specific range largely ineffective. Coarse particles can maintain the non-blocking state by eliminating the stress arch and increasing the advantages of load and gravity flow, that is, increasing α, D and H can reduce the risk of ore pass hang-up. Through blasting technology, the agglomeration and stress arch effect are disintegrated, so as to realize efficient unclogging of the ore pass. This study provides theoretical support and an engineering paradigm for the treatment of adhesion hang-up in high ore pass.

为了解决高矿道中颗粒颗粒的黏附挂起问题，本研究结合了现场调查、粒度统计和颗粒间黏附力学表征。通过微观结块机理与宏观结块条件耦合的多尺度分析，揭示了矿道悬吊的基本力学本质。提出了高效的疏通技术，并完成了工程应用。结果表明：颗粒颗粒的接触和粘附力学行为受颗粒级配的显著控制，法向接触力Fn、切向接触力Fs和毛细桥力Fc均随粒径的增大而增大，其中相似粒径组合下Fn、Fs和Fc的急剧增大是导致挂机的核心原因。接触角φ和颗粒级配作为胶粘剂平衡的协调控制参数。垂直（ϕ = 90°）接触和水平（ϕ = 0°）接触导致正常胶粘剂和切向胶粘剂分别因颗粒重量和粒径的差异而失效。细粒颗粒容易因团聚而出现持续挂起现象，在一定范围内调整矿道直径D、倾斜度α和颗粒高度H基本无效。粗颗粒通过消除应力拱、增大载荷和自重流优势，即增大α、D和H可以降低矿道悬吊风险，从而保持矿道的非阻塞状态。通过爆破技术，消除了矿槽的结块和应力拱效应，实现了矿槽的高效疏通。该研究为高溜井黏附悬吊的治理提供了理论支持和工程范例。

{"title":"Study on multi-scale mechanism and unclogging technology of granular particles adhesion hang-up in high ore pass","authors":"Yu Xiong , Lichun Jiang , Fei Li , Zhanglong Liu , Zhi Yang","doi":"10.1016/j.engfailanal.2026.110556","DOIUrl":"10.1016/j.engfailanal.2026.110556","url":null,"abstract":"<div><div>To address the problem of granular particles adhesion hang-up in high ore passes, this study combines field investigation, particle size statistics, and the characterization of inter-particle adhesive mechanics. Through a multi-scale analysis that couples micro-agglomeration mechanism and macro-blocking conditions, it reveals the fundamental mechanical essence of ore pass hang-up. Furthermore, the efficient unclogging technology is put forward, and the engineering application is completed. The results show that the mechanical behavior of contact and adhesion of granular particles is significantly controlled by particle gradation, and the normal contact force <em>F<sub>n</sub></em>, tangential contact force <em>F<sub>s</sub></em> and capillary bridge force <em>F<sub>c</sub></em> all increase with the increase of particle size, among which the sharp increase of <em>F<sub>n</sub></em>, <em>F<sub>s</sub></em> and <em>F<sub>c</sub></em> under similar particle size combinations is the core inducement of hang-up. The contact angle <em>ϕ</em> and particle grading serve as coordinated control parameters for adhesive balance. Vertical (<em>ϕ</em> = 90°) and horizontal (<em>ϕ</em> = 0°) contact lead to the failure of normal and tangential adhesive due to the disparity of particle weight and particle size, respectively. Fine particles are prone to persistent hang-up due to agglomeration, rendering adjustments to ore pass diameter <em>D</em>, inclination <em>α</em> and granular height <em>H</em> in a specific range largely ineffective. Coarse particles can maintain the non-blocking state by eliminating the stress arch and increasing the advantages of load and gravity flow, that is, increasing <em>α</em>, <em>D</em> and <em>H</em> can reduce the risk of ore pass hang-up. Through blasting technology, the agglomeration and stress arch effect are disintegrated, so as to realize efficient unclogging of the ore pass. This study provides theoretical support and an engineering paradigm for the treatment of adhesion hang-up in high ore pass.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"186 ","pages":"Article 110556"},"PeriodicalIF":5.7,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145972781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on deformation and failure laws and differentiated control of surrounding rock in the return air entry of extremely close distance lower seam 极近距离下煤层回风巷道围岩变形破坏规律及差异化控制研究

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-07 DOI: 10.1016/j.engfailanal.2026.110557

Xiaofei Guo, Wenbo Zhang, Xiongxiong Jin, Kunlin Yang, Yinwei Wang, Yushan Liu

Stability control of the surrounding rock in development roadways of extremely close-distance lower coal seams is a crucial prerequisite for safe mining in underground coal mines. This study aims to reveal the deformation and failure mechanisms of the surrounding rock in such roadways, taking the extremely close-distance No. 9 and No. 11 coal seams in Dianye No. 1 Mine as the research object. It elucidates the response mechanisms and failure patterns of roadways under such complex mining-induced stresses. The results indicate that the return airway of the No. 11 coal seam is primarily influenced by the mining of the No. 9 coal seam working face and its own excavation. In contrast, the mining of the working face within the same coal seam, due to the presence of protective coal pillars along the roadway, exerts a certain pressure-relief and protective effect on the corresponding roadway section. The study further reveals the evolutionary pattern of the plastic zone morphology in the surrounding rock and clarifies the correlation between stress variations and the plastic zone. The lateral pressure coefficient dominates the failure mode of the surrounding rock, while the magnitude of the principal stress and the strength of the rock mass jointly regulate the extent of failure. The deflection angle of the principal stress directs the propagation path of the plastic zone. A differentiated support design based on the stress zones of the surrounding rock is proposed. Under remnant coal pillars, a trapezoidal roadway section with rock bolting, mesh, and cable support is adopted to utilize the self-supporting capacity of the surrounding rock and the structural characteristics of the strata. In high-stress environments under goaf areas, a arched roadway section with combined support of “rock bolting, mesh, cable, beam, and U-shaped steel supports” is implemented.

极近距离下煤层开发巷道围岩稳定性控制是地下煤矿安全开采的重要前提。本研究以电业1矿距离极近的9号、11号煤层为研究对象，旨在揭示此类巷道围岩变形破坏机理。阐明了巷道在复杂采动应力作用下的响应机制和破坏模式。结果表明：11号煤层回采巷道主要受9号煤层工作面回采及自身开挖的影响。而同一煤层内工作面开采，由于沿巷道存在保护煤柱，对相应的巷道段起到一定的卸压保护作用。研究进一步揭示了围岩塑性区形态演化规律，阐明了应力变化与塑性区的相关性。侧压力系数主导围岩破坏模式，主应力大小和岩体强度共同调节破坏程度。主应力的挠度角指导塑性区的传播路径。提出了一种基于围岩应力区的差异化支护设计方法。在残余煤柱下，采用锚杆支护、网眼支护、锚索支护的梯形巷道断面，充分利用围岩的自支护能力和地层的结构特点。在采空区高应力环境下，采用“锚杆、网、索、梁、u型钢支撑”组合支护的拱式巷道断面。

{"title":"Study on deformation and failure laws and differentiated control of surrounding rock in the return air entry of extremely close distance lower seam","authors":"Xiaofei Guo, Wenbo Zhang, Xiongxiong Jin, Kunlin Yang, Yinwei Wang, Yushan Liu","doi":"10.1016/j.engfailanal.2026.110557","DOIUrl":"10.1016/j.engfailanal.2026.110557","url":null,"abstract":"<div><div>Stability control of the surrounding rock in development roadways of extremely close-distance lower coal seams is a crucial prerequisite for safe mining in underground coal mines. This study aims to reveal the deformation and failure mechanisms of the surrounding rock in such roadways, taking the extremely close-distance No. 9 and No. 11 coal seams in Dianye No. 1 Mine as the research object. It elucidates the response mechanisms and failure patterns of roadways under such complex mining-induced stresses. The results indicate that the return airway of the No. 11 coal seam is primarily influenced by the mining of the No. 9 coal seam working face and its own excavation. In contrast, the mining of the working face within the same coal seam, due to the presence of protective coal pillars along the roadway, exerts a certain pressure-relief and protective effect on the corresponding roadway section. The study further reveals the evolutionary pattern of the plastic zone morphology in the surrounding rock and clarifies the correlation between stress variations and the plastic zone. The lateral pressure coefficient dominates the failure mode of the surrounding rock, while the magnitude of the principal stress and the strength of the rock mass jointly regulate the extent of failure. The deflection angle of the principal stress directs the propagation path of the plastic zone. A differentiated support design based on the stress zones of the surrounding rock is proposed. Under remnant coal pillars, a trapezoidal roadway section with rock bolting, mesh, and cable support is adopted to utilize the self-supporting capacity of the surrounding rock and the structural characteristics of the strata. In high-stress environments under goaf areas, a arched roadway section with combined support of “rock bolting, mesh, cable, beam, and U-shaped steel supports” is implemented.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"187 ","pages":"Article 110557"},"PeriodicalIF":5.7,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatigue endurance of rib-to-deck welded joint in orthotropic steel deck panel 正交各向异性钢甲板肋-甲板焊接接头的疲劳耐久性

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2026-01-06 DOI: 10.1016/j.engfailanal.2026.110553

Kirill Golubiatnikov , Eva Schmidova , Pavel Ryjacek , Stanislav Hracov , Shota Urushadze , Filip Klejch

This study presents fatigue, fractography, and numerical analyses of a prefabricated orthotropic steel deck panel that had been in service on a real bridge before undergoing a fatigue laboratory test. The study focused on rib-to-deck welded joints executed as intermittent one-sided fillet welds.

Fractographic and fatigue analyses identified four typical crack types: “toe-rib”, “root-weld”, “root-deck” and “toe-deck”. The latter two types occurred only under loading parallel to the rib web, while the “root-weld” crack type was likely associated with a significant transverse shear stress component. The results indicate that the fatigue endurance of these joints is highly sensitive to shear stress. A proposed threshold for the necessity of considering shear stress influence is shear-to-normal stress ratio of 0.2 and 0.1 for the Nominal Stress and Hot Spot Stress methods, respectively. Two cracks were initially oblique toward the toe, potentially linked to grain coarsening in the heat-affected zone.

Mean reference fatigue strengths were 93 MPa for the Nominal Stress and 108 MPa for the Hot Spot Stress methods, with guaranteed characteristic values of 69 MPa and 86 MPa. Considering shear stress influence as a reduction factor for the reference characteristic value for normal stress proved ineffective.

本研究介绍了预制正交各向异性钢桥面板的疲劳、断口学和数值分析，该桥面板在进行疲劳实验室测试之前已在真实桥梁上使用。该研究的重点是肋板与甲板之间的焊接接头，这些焊接接头是间歇性的单边角焊缝。断口学和疲劳分析确定了四种典型的裂纹类型：“趾肋”、“根焊缝”、“根甲板”和“趾甲板”。后两种类型只发生在平行于肋腹板的荷载下，而“根焊”裂纹类型可能与显著的横向剪应力分量有关。结果表明，节理的疲劳耐久性对剪切应力高度敏感。对于名义应力和热点应力方法，考虑剪应力影响必要性的建议阈值分别为剪应力-正应力比0.2和0.1。两个裂缝最初是斜向脚趾的，可能与热影响区的晶粒变粗有关。名义应力法和热点应力法的平均参考疲劳强度分别为93 MPa和108 MPa，保证特征值分别为69 MPa和86 MPa。将剪应力影响作为法向应力参考特征值的折减因子被证明是无效的。

{"title":"Fatigue endurance of rib-to-deck welded joint in orthotropic steel deck panel","authors":"Kirill Golubiatnikov , Eva Schmidova , Pavel Ryjacek , Stanislav Hracov , Shota Urushadze , Filip Klejch","doi":"10.1016/j.engfailanal.2026.110553","DOIUrl":"10.1016/j.engfailanal.2026.110553","url":null,"abstract":"<div><div>This study presents fatigue, fractography, and numerical analyses of a prefabricated orthotropic steel deck panel that had been in service on a real bridge before undergoing a fatigue laboratory test. The study focused on rib-to-deck welded joints executed as intermittent one-sided fillet welds.</div><div>Fractographic and fatigue analyses identified four typical crack types: “toe-rib”, “root-weld”, “root-deck” and “toe-deck”. The latter two types occurred only under loading parallel to the rib web, while the “root-weld” crack type was likely associated with a significant transverse shear stress component. The results indicate that the fatigue endurance of these joints is highly sensitive to shear stress. A proposed threshold for the necessity of considering shear stress influence is shear-to-normal stress ratio of 0.2 and 0.1 for the Nominal Stress and Hot Spot Stress methods, respectively. Two cracks were initially oblique toward the toe, potentially linked to grain coarsening in the heat-affected zone.</div><div>Mean reference fatigue strengths were 93 MPa for the Nominal Stress and 108 MPa for the Hot Spot Stress methods, with guaranteed characteristic values of 69 MPa and 86 MPa. Considering shear stress influence as a reduction factor for the reference characteristic value for normal stress proved ineffective.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"186 ","pages":"Article 110553"},"PeriodicalIF":5.7,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145921367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0