Procedia Structural Integrity最新文献_第4页

Longitudinal fracture study of inhomogeneous beams built in ends subjected to increased temperature 端部非均匀梁受温度升高影响的纵向断裂研究

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2026.01.051

Victor Rizov

This paper treats the problem of longitudinal fracture in continuously inhomogeneous beam structures at increased temperature. The beams are built in the ends, i.e. they are statically indeterminate structures. Besides, the beams have non-linear elastic behaviour. Due to material inhomogeneity the material properties, including the coefficient of thermal expansion, are distributed continuously along the beam length. The integral J is applied in the analysis. Equations for resolving of statically indeterminacy at increased temperature are composed and solved. The field of stresses and strains are obtained and used for solving the integral J. The strain energy release rate is determined to check-up the integral J. In this relation, the complementary strain energy cumulated in the beams at an increased temperature is obtained and used for deriving the solution of the strain energy release rate. The combined effect of distribution of material properties along the beam length and the increased temperature on the longitudinal fracture is explored. The results obtained are reported in the form of various graphs illustrating how the value of the integral J changes when the parameters of the model of the beam with a longitudial crack are varied. Special attention is paid to exploring the effect of the ratios of the values of material properties in the end sections of the inhomogeneous beam structure on the longitudinal fracture. The exploration indicates that the value of the integral J grows when the ratio of the values of the two parameters of the non-linear constitutive law in the right and left ends of the beam structure grows. The growth of the ratio of the values of the coefficient of thermal expansion in the right and left ends of the beam leads also to increase of the J integral value. These findings clearly indicate that neglecting the influence of the increased temperature on the longitudinal fracture may have rather negative effects on the safety and reliability of the inhomogeneous beam structures under consideration in this paper.

本文研究了连续非均匀梁结构在高温下的纵向断裂问题。梁建在两端，即它们是超静定结构。此外，梁具有非线性弹性特性。由于材料的不均匀性，材料的性能，包括热膨胀系数，沿光束长度连续分布。在分析中应用了积分J。建立并求解了温度升高时静不确定性的求解方程。求出应力场和应变场，用于求解积分j。确定应变能释放率，对积分j进行检验。在此关系式中，可得到温度升高时梁内累积的互补应变能，并用于推导应变能释放率的解。探讨了材料性能沿梁长分布和温度升高对纵向断裂的综合影响。所得结果以各种图形的形式报告，说明了当含纵裂缝梁的模型参数变化时积分J值的变化情况。重点探讨了非均匀梁结构端部材料性能值的比值对纵向断裂的影响。研究表明，当梁结构左右两端非线性本构律的两个参数值之比增大时，积分J的值也随之增大。随着梁左右两端热膨胀系数比值的增大，J积分值也随之增大。这些结果清楚地表明，忽略温度升高对纵向断裂的影响可能会对本文所考虑的非均质梁结构的安全性和可靠性产生相当负面的影响。

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引用次数: 0

Impact loading analysis of tubular adhesive joints with geometrical modifications 管状接头几何变形的冲击载荷分析

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2026.01.015

P.D.A. da Silva , R.D.S.G. Campilho , M.J.R. Queirós , D.C. Gonçalves , K. Madani

Adhesive joints are valued for their ability to reduce weight, lower manufacturing costs, and expedite the assembly process. In applications where impact loading is critical, evaluating the dynamic response of adhesive structures becomes essential to ensure safety. This study presents a numerical investigation of tubular adhesive joints subjected to impact loads, examining the effects of different adhesive types. The impact damage was simulated using an adapted cohesive zone model (CZM) implemented in Abaqus®. A parametric study was conducted including inner (q) and outer (a) chamfers on the adherends, and adhesive fillets (b). The results include distributions of normal (s_y) and shear (t_xy) stresses, load-displacement (P-d) behaviour, absorbed energy (E_a), and peak load (P_m). The joints’ mechanical performance of adhesive joints was highly sensitive to the design parameters, leading to recommendations to optimize tubular adhesive joints under impact.

粘合接头的价值在于其减轻重量、降低制造成本和加快装配过程的能力。在冲击载荷至关重要的应用中，评估粘接结构的动态响应对于确保安全至关重要。本文对受冲击载荷作用的管状粘结接头进行了数值研究，考察了不同粘结类型对接头的影响。使用Abaqus®实现的自适应内聚区模型（CZM）模拟冲击损伤。进行了参数化研究，包括粘附物上的内(q)和外(A)倒角，以及粘合圆角(b)。结果包括法向（sy）和剪切（xy）应力的分布，载荷-位移（P-d）行为，吸收能量（Ea）和峰值载荷（Pm）。粘结接头的力学性能对设计参数高度敏感，建议对冲击作用下的管状粘结接头进行优化。

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引用次数: 0

Characterization of Dowelled Cross-Laminated Timber Panels Made of Uruguayan Fast-Grown Species 由乌拉圭速生树种制成的带榫交叉层压木板的特性

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2026.01.058

Gastón Bruzzone , Daniel Godoy , Stephany Arrejuría , Diego Passarella , Sebastián Quagliotti , Silvia Böthig , Laura Moya

In recent decades, the development of adhesive-free engineered timber products has become one of the primary research areas in timber construction systems. This paper studies the structural behaviour of Dowelled Cross-Laminated Timber (DCLT) panels made of Uruguayan fast-growing Pinus taeda, connected by hardwood dowels. Two series, each comprising three structural-size panels were constructed using C14 and C22 classes timber, joined by 20 mm Eucalyptus grandis dowels. Shear tests on dowelled-cross connections and four-point bending tests on DCLT panels were performed, and the slip modulus and bending properties, respectively, were obtained. Results indicated that DCLT-C22 panels showed significantly higher bending strength (16.1 MPa) and stiffness (3,091 MPa) values than DCLT-C14 panels (10.7 MPa; 2,228 MPa), suggesting that the quality of lamellae had influence on the panel’s structural properties. The typical failure mode occurred under tension exclusively in the bottom lamellae, with fractures attributed to the presence of knots along the drilled holes and near the load application area. Wooden dowels exhibited minor visible fractures and crushing along their length. These findings suggest that adhesive-free cross-laminated timber panels made from Uruguayan pine are a promising alternative for residential floors and roof uses, advancing more sustainable construction systems.

近几十年来，无胶粘剂工程木制品的开发已成为木结构体系的主要研究领域之一。本文研究了乌拉圭快速生长的松材（Pinus taeda）用硬木销钉连接的交叉层合木（DCLT）板的结构性能。两个系列，每个由三个结构尺寸的面板组成，使用C14和C22级木材，由20毫米桉树销钉连接。对DCLT嵌固交叉连接进行了剪切试验，对DCLT面板进行了四点弯曲试验，得到了DCLT面板的滑移模量和弯曲性能。结果表明，DCLT-C22面板的抗弯强度（16.1 MPa）和刚度（3091 MPa）值明显高于DCLT-C14面板（10.7 MPa和2228 MPa），表明片层质量对面板的结构性能有影响。典型的破坏模式只发生在底部片层，裂缝是由于钻孔沿线和加载区域附近的结的存在。木榫沿其长度有轻微可见的断裂和压碎。这些发现表明，由乌拉圭松木制成的无粘合剂交叉层压木板是住宅地板和屋顶用途的一种有前途的替代品，可以推进更可持续的建筑系统。

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引用次数: 0

Evaluation of fatigue strength of polymer-matrix composites based on thermographic data analysis 基于热成像数据分析的聚合物基复合材料疲劳强度评价

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2026.01.002

Tomasz Rogala , Andrzej Katunin , Jafar Amraei

Accurate assessment of fatigue strength across different lifetimes traditionally requires conventional high-cycle fatigue (HCF) testing, a reliable but time consuming method. As an alternative, thermographic techniques (TT) offer a rapid estimation of fatigue strength, particularly for polymer matrix composites (PMCs) in the HCF regime. This study evaluates the effectiveness of two common thermographic approaches, the temperature-stress ∆T_s - σ and heat dissipation rate-stress q-σ approaches for estimating fatigue strength (σ_TT) in neat glass fiber-reinforced polymer (GFRP), GFRP with graphene nanoparticle reinforcement (GFRP-GNPs), and GFRP with hybrid nanoparticle reinforcement (GFRP-HNPs). Classical fatigue tests were conducted at 40 Hz under fully reversed loading (R = -1) and compared against thermographic predictions across multiple estimation methods: Bilinear (BL), Angular Change (AC), Minimum Curvature Radius (MCR), and Maximum Perpendicular Distance (MPD).

Thermographic estimations showed strong correlation with fatigue strength σ S-N determined using S-N curve at 10⁷ cycles, with the q-σ approach yielding an average relative error of only 0.6%. Among estimation techniques, the MPD method demonstrated the highest accuracy, with relative errors of -5.2% for

传统上，准确评估不同寿命周期内的疲劳强度需要传统的高周疲劳（HCF）测试，这是一种可靠但耗时的方法。作为一种替代方案，热成像技术（TT）可以快速估计疲劳强度，特别是对于HCF状态下的聚合物基复合材料（pmc）。本研究评估了两种常用的热成像方法，温度-应力∆Ts -σ和散热率-应力q-σ方法，用于估算纯玻璃纤维增强聚合物（GFRP）、石墨烯纳米颗粒增强的GFRP （GFRP- gnps）和混合纳米颗粒增强的GFRP （GFRP- hnps）的疲劳强度（σ tt）。在完全反向载荷（R = -1）下，在40 Hz下进行经典疲劳试验，并与多种估计方法（双线性（BL）、角变化（AC）、最小曲率半径（MCR）和最大垂直距离（MPD））的热成像预测结果进行比较。在107次循环时，热像法与S-N曲线测定的疲劳强度σ S-N有很强的相关性，而q-σ法的平均相对误差仅为0.6%。在估计技术中，MPD方法显示出最高的精度，相对误差为-5.2%

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引用次数: 0

Influence of Time and Temperature Variables on the Heat Treatment of an AL-MG SI Alloy 时间和温度对AL-MG - SI合金热处理的影响

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2026.01.038

João E. Ribeiro , Hernani Lopes , João Rocha

This study investigates the effect of time and temperature on the heat treatment of 6082 Al-Mg-Si alloy. Solubilization, quenching, and artificial aging were performed under parameter combinations defined using the Taguchi method. Mechanical testing supported the development of a multiple linear regression model, which identified aging temperature as the most significant factor influencing ultimate tensile strength and yield strength. High aging temperatures promoted coarse precipitate formation and reduced strength, while lower temperatures minimized this effect and maintained or improved mechanical performance. The results demonstrate the potential of combining statistical design with predictive modeling to optimize heat treatment parameters and enhance alloy performance for industrial applications.

研究了时间和温度对6082铝镁硅合金热处理的影响。在使用田口法定义的参数组合下进行增溶、淬火和人工时效。力学试验支持多元线性回归模型的建立，该模型确定时效温度是影响极限抗拉强度和屈服强度的最显著因素。较高的时效温度促进了粗相的形成，降低了强度，而较低的温度则使这种影响最小化，并保持或提高了机械性能。结果表明，将统计设计与预测建模相结合，可以优化热处理参数，提高合金的工业应用性能。

引用次数: 0

Development of MAXCarbon: Advancing Hybrid Fibre Solutions for High-Performance Applications MAXCarbon的发展：为高性能应用推进混合光纤解决方案

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2026.01.040

Fabian Jung , Niels Grigat , Dr. Kumar Jois , Marcus Welsh , Ben Vollbrecht

The advancement of aerospace, energy, and hypersonic technologies has amplified the need for fibre materials that maintain structural integrity under extreme thermal and oxidative conditions. Conventional high-performance fibres such as carbon and silicon carbide (SiC), while exhibiting excellent mechanical properties, suffer from oxidative degradation above 1300 °C, thereby limiting their applicability in demanding environments. To address this limitation, RWTH Aachen has developed MAXCarbon, a novel hybrid fibre designed to enhance oxidation and corrosion resistance. MAXCarbon is produced by transforming commercially available continuous carbon fibres into hybrid fibres via a tailored reactive synthesis process, which generates a protective ceramic MAX-phase (Ti₃SiC₂) interface directly on the fibre surface. This process yields fibres with a carbon core and a Ti₃SiC₂ boundary layer, effectively combining the high tensile strength of carbon with the oxidation resistance of the MAX-phase. The resulting hybrid fibre offers promising potential for integration into advanced textile architectures and composite systems. Targeted applications include gas turbine components, thermal protection systems, high-temperature aerospace sensors, and electrochemical devices, where resistance to extreme thermal and oxidative environments is critical. The development of MAXCarbon not only represents a step forward in hybrid fibre technology but also contributes to strengthening European strategic autonomy in high-performance material production.

航空航天、能源和高超音速技术的进步扩大了对纤维材料的需求，这些材料可以在极端的热和氧化条件下保持结构完整性。传统的高性能纤维，如碳和碳化硅（SiC），虽然具有优异的机械性能，但在1300°C以上会遭受氧化降解，从而限制了它们在苛刻环境中的适用性。为了解决这一限制，亚琛工业大学开发了MAXCarbon，一种新型混合纤维，旨在增强抗氧化和抗腐蚀能力。MAXCarbon是通过定制的反应合成工艺将商业上可用的连续碳纤维转化为混合纤维而生产的，该工艺直接在纤维表面产生保护性陶瓷max相（Ti₃SiC₂）界面。该工艺生产的纤维具有碳芯和Ti₃SiC₂边界层，有效地结合了碳的高抗拉强度和max相的抗氧化性。由此产生的混合纤维为集成到先进的纺织结构和复合系统中提供了巨大的潜力。目标应用包括燃气轮机部件、热保护系统、高温航空传感器和电化学设备，这些应用对极端热和氧化环境的抵抗力至关重要。MAXCarbon的开发不仅代表了混合纤维技术的进步，而且有助于加强欧洲在高性能材料生产方面的战略自主权。

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引用次数: 0

Monitoring of cleanroom environmental quality as a function of air exchange 监测洁净室环境质量作为空气交换的功能

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2026.01.024

Alexander Čaja , Martin Vantúch , Andrej Kapjor , Nikola Čajová Kantová

This paper focuses on the monitoring of cleanroom environmental quality as a function of air exchange rates. Addressing this topic is crucial for several reasons that impact various industries and have a direct effect on the environment. The most important reasons include product quality, health and safety, energy efficiency, structural integrity, and also compliance with standards and regulations. The aim of this paper is to analyze the influence of various air exchange rates on airborne particle concentration and temperature-humidity parameters, while considering the preservation of structural stability and functionality of cleanrooms. The research employs a combination of monitoring methods, including continuous measurement of particle concentration using optical particle counters and measurement of temperature and humidity using digital sensors. The results will provide quantitative data on the correlation between air exchange and environmental quality in cleanrooms, enabling the optimization of operational parameters and ensuring the required cleanliness class. It also focuses on identifying potential risks to structural integrity that may lead to damage to cleanroom components.

本文的重点是监测洁净室环境质量作为空气交换率的函数。解决这个问题至关重要，有几个原因会影响到各个行业，并对环境产生直接影响。最重要的原因包括产品质量、健康和安全、能源效率、结构完整性以及符合标准和法规。本文的目的是分析不同的空气交换率对空气中颗粒浓度和温湿度参数的影响，同时考虑保持洁净室的结构稳定性和功能。该研究采用了多种监测方法，包括使用光学颗粒计数器连续测量颗粒浓度和使用数字传感器测量温度和湿度。该结果将提供洁净室空气交换与环境质量之间相关性的定量数据，从而实现操作参数的优化并确保所需的清洁度等级。它还侧重于识别可能导致洁净室组件损坏的结构完整性的潜在风险。

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引用次数: 0

Comparison of Mechanical Stimuli for Trabecular-bone Adaptation: In Silico Prediction Framework 机械刺激对小梁骨适应的比较：计算机预测框架

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2026.01.026

Zihao Liu , Simin Li , Vadim V. Silberschmidt

Trabecular-bone adaptation (TBA) is a continuous process, adjusting bone morphology against external loading and driven by mechanical stimuli. Various stimulus types such as strain energy density (SED) and stress magnitude were extensively studied. However, the in silico quantification and comparison of local trabeculae morphology caused by different mechanical stimuli, especially the parts of decomposed SED remains underexplored. This study introduces a 3D finite-element (FE) model to simulate mechanically driven TBA, with the aim to quantify the results of TBA models with different mechanical stimuli. Utilizing FE software ABAQUS with user-defined subroutines, the models simulate the trabeculae evolution under mechanical load. The outcome for the total SED, deviatoric SED and von Mises stress are compared, quantified with morphometric parameters of TB structure. The results show that the total first stimulus with equally weighted hydrostatic and deviatoric components demonstrates a higher resorption tendency compared to the deviatoric SED. This could be explained by its higher - quadratic - dependence on effective stress, while the results for the models based on von Mises stress are related to this stress linearly. This work advances the understanding of contribution of different mechanical stimuli to the TBA process at single-trabeculae level, offering insights into the trigger mechanism of trabecular-bone adaptation.

骨小梁适应（TBA）是一个连续的过程，在机械刺激的驱动下，调节骨形态以抵抗外部载荷。各种刺激类型如应变能密度（SED）和应力大小进行了广泛的研究。然而，不同机械刺激引起的局部小梁形态的计算机量化和比较，特别是分解的SED部分仍未得到充分的研究。本研究引入三维有限元（FE）模型来模拟机械驱动的TBA，旨在量化不同机械刺激下TBA模型的结果。利用有限元软件ABAQUS和用户自定义子程序，模拟了机械载荷下小梁的演化过程。比较了总SED、偏SED和von Mises应力的结果，并用TB结构的形态计量学参数进行了量化。结果表明，流体静力分量和偏力分量权重相等的总第一刺激比偏力SED有更高的吸收倾向。这可以解释为其对有效应力具有较高的二次依赖性，而基于von Mises应力的模型结果与有效应力呈线性相关。这项工作促进了对不同机械刺激在单小梁水平上对TBA过程的贡献的理解，为小梁-骨适应的触发机制提供了见解。

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引用次数: 0

Comparison of life prediction methods for net-shape IN718 manufactured by L-PBF L-PBF生产净形IN718寿命预测方法比较

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2025.12.293

Daniel Perghem , Luca Patriarca , Lorenzo Bongiorni , Simone Romano , Stefano Beretta

The aerospace industry is increasingly considering metal additive manufacturing (AM) technology to produce optimized components that offer high design flexibility, complex geometries, and reduced weight. However, the surface quality and orientation of printed components remain critical factors influencing their fatigue life. This research aims to assess the impact of different surface qualities, including orientation and post-processing treatments, on the fatigue behaviour of a nickel-chromium alloy (Inconel 718) manufactured via laser powder bed fusion (L-PBF). The study examines key surface related variables that affect the fatigue strength of L-PBF parts, i.e., surface roughness and sub/near-surface anomalies, identifying the anomalies that predominantly contribute to failure across various surface qualities. A life prediction model is developed to accurately estimate fatigue life by integrating the influence of anomaly characteristics associated with specific surface treatments and orientations.

航空航天业越来越多地考虑金属增材制造（AM）技术，以生产具有高设计灵活性、复杂几何形状和减轻重量的优化部件。然而，打印件的表面质量和取向仍然是影响其疲劳寿命的关键因素。本研究旨在评估不同表面质量（包括取向和后处理）对激光粉末床熔合（L-PBF）制造的镍铬合金（Inconel 718）疲劳行为的影响。该研究检查了影响L-PBF零件疲劳强度的关键表面相关变量，即表面粗糙度和亚表面/近表面异常，确定了导致各种表面质量失效的主要异常。建立了一种寿命预测模型，通过综合与特定表面处理和取向相关的异常特征的影响，准确估计疲劳寿命。

引用次数: 0

Influence of manufacturing defects in bicycle frames on their fatigue strength 自行车车架制造缺陷对其疲劳强度的影响

Procedia Structural Integrity

Pub Date : 2026-01-01 DOI: 10.1016/j.prostr.2025.12.298

Filip Likavčan , Miroslava Kučerková , Katarína Jevčáková , Vladimír Chmelko

The paper presents a methodology for the computational assessment of the fatigue strength of bicycle frames, taking into account the specific characteristics of their manufacture and operation. Several technologies are used in the manufacture of bicycle frames, including welding, gravity casting, pressure casting, hydroforming, etc. Each technology creates a different microstructure and carries a risk of defects. The design also requires a computational estimate of the fatigue life, which is then experimentally verified according to standards for bicycle frame testing (ISO 4210/EN 14766, Zedler test, etc.). The engineering calculation of fatigue life assumes the same cyclic properties of the frame material and ideal geometry of the structure. The paper analyzes defects in industrially manufactured aluminum alloy frames and geometric deviations of their design from the ideal shape. An experimental simulation methodology for determining the relevant load spectrum for individual operating conditions of bicycle frames is proposed and discussed.

本文提出了一种考虑车架制造和使用的具体特点的车架疲劳强度计算方法。自行车车架的制造采用了几种技术，包括焊接、重力铸造、压力铸造、液压成形等。每种技术都会产生不同的微观结构，并有产生缺陷的风险。设计还需要对疲劳寿命进行计算估计，然后根据自行车车架试验标准（ISO 4210/EN 14766， Zedler试验等）进行实验验证。疲劳寿命的工程计算假定框架材料具有相同的循环特性和结构的理想几何形状。分析了工业生产铝合金车架的缺陷及其设计与理想形状的几何偏差。提出并讨论了一种确定自行车车架各工况相关载荷谱的实验模拟方法。

引用次数: 0