Engineering Fracture Mechanics最新文献

英文中文

Corrigendum to “Study on the effects and mechanisms of ultrasonic impact treatment on impact toughness of Q345 steel welded joints” [Volume 315 (2025) 110754]

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-16 DOI: 10.1016/j.engfracmech.2025.110924

Bangping Gu , Yuchen Yang , Yansong Wang , Jintao Lai , Guanhua Xu , Liqiang Gao , Yongli Hu , Fangzheng Luo

引用次数: 0

Stress-structure controlled time-dependent fracture mechanism of deep jointed granite: Acoustic emission moment tensor method

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-16 DOI: 10.1016/j.engfracmech.2025.110953

Mengfei Jiang, Jun Zhao, Chen Fan

It is crucial to investigate the time-dependent fracture mechanism of jointed rock for understanding the time-delayed disaster development process induced by joints in deep underground engineering construction. The creep tests of natural jointed granite under true triaxial stress were conducted. The complete process of stress-structure controlled failure was analyzed from the perspectives of spatio-temporal evolution of microcracks, nature of microcracks and spatial relationship between microcracks and joint plane. Furthermore, the fracture mechanism and the effect of joints were revealed. The results show that the fracture of jointed rock is essentially a process in which tensile and shear cracks gradually approach the joint plane and cluster around it. When the microcracks gather to a certain extent, the local area of the joint cracking, which triggers the global shear fracture of the joint. In detail, during the creep test of jointed granite, the proportion of shear cracks decreases first and then increases. The evolution of AE event number with time shows the characteristics of attenuation, then steady-state behavior. When the rock is in critical failure, the three types of microcracks begin to increase rapidly, and the response speed and increase rate of shear microcracks is the fastest.

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引用次数: 0

Thermal fracture behavior and strength evolution of oil shale under high-temperature steam treatment: A dual-stage analysis of mechanical response

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-16 DOI: 10.1016/j.engfracmech.2025.110939

Yichao Jia , Fan Wu , Dong Yang , Xudong Huang

This study investigates the mechanical and fracturing behavior of oil shale (OS) under high-temperature steam to understand the stability of surrounding rock in main fracture channels and the mechanisms of hardening and enhanced pyrolysis. Using Balikun OS, experiments were performed with a high-temperature uniaxial testing machine, examining mechanical properties under different bedding orientations in steam conditions. Combined with CT scanning and microcomponent analysis, the evolution of pore-fracture structures and their influence on mechanical properties were comprehensively studied. Results show significant strength softening of OS in range of 25℃ to 400℃, while strength recovery occurs between 400℃ and 550℃. A deterioration index reveals 400℃ as the critical temperature where softening transitions to hardening. Microscopic analysis shows that fracture volume and porosity increase with temperature, following a “rapid growth–slow growth–exponential rise” trend. At the same temperature, oil shale with parallel bedding forms complex pore networks, while perpendicular bedding samples exhibit more dispersed fractures. Below 400℃, increased porosity and fracture network expansion lead to softening, with parallel bedding samples showing greater damage. Above 400℃, matrix strengthening due to pyrite decomposition and lattice changes in kaolinite and chlorite drive strength recovery. The mechanical response of oil shale transitions from “high strength-low ductility” to “low strength-high ductility” as the temperature increases, and gradually begins to recover its “high strength-low ductility” characteristics around 400℃. From 400℃ to 550℃, friction between fractures and the matrix weakens, and pore pressure from pyrolysis gases induces brittle failure. Engineering applications suggest multi-stage high-temperature steam fracturing with proppants to avoid the “low strength-high ductility” stage in main fracture channels, enhancing stability and enabling efficient pyrolysis extraction.

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引用次数: 0

Investigations of strength and fracturing characteristics of flawed sandstone by true triaxial compression: Sensitivity to the flaw orientation

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-16 DOI: 10.1016/j.engfracmech.2025.110929

Hai-Tao Wang , Jian-Zhi Zhang , Lu Zheng , Ru-Fang Zhan , Jin Yu , Ting Zhang

True triaxial experiment with a synchronous acoustic emission (AE) monitoring system is a popular measure for the assessment of strength and cracking behaviors of brittle flawed rocks under anisotropic stress circumstances. This measure is employed to invest the dependency of the strength and fracturing characteristics of flawed sandstone under true triaxial stress on the flaw orientation. Observations first quantitatively reveal the three types of failure mechanisms including structure-control, stress-structure collaborative control and stress-control, dependent on the flaw orientation with respect to the 3D (three-dimensional) stress. Second, the elastoplastic strain increment ratio (EPSIR) method is creatively introduced to identify the stress thresholds in flawed sandstone under true triaxial stress. Third, a significant increase in the true triaxial strength of flawed sandstone among the tested flaw configurations is correlated with the intensification of the shear mechanism. The 3D stress-driven progressive failure of flawed sandstone is also investigated experimentally, as well as the AE (acoustic emission) characteristics and the strength prediction. Current experiments provide insights into the brittle failure mechanisms of flawed rocks and help interpret the excavation instability in deep underground engineering.

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引用次数: 0

Effect of lateral stress and loading paths on direct shear strength and fracture of granite under true triaxial stress state by a self-developed device

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-16 DOI: 10.1016/j.engfracmech.2025.110952

Zaobao Liu , Binhui Liu , Liang Chen , Feng Tian , Jianyu Xu , Jian Liu , Qiang Yang , Baoquan Zhu

Direct shear is the stress path that rockmass undergoes often and is thus important to the stability evaluation of underground openings in deep tunnels. This study introduces a self-developed true triaxial direct shear device capable of achieving large displacement direct shear, providing a basis for the multi-stage shear experiments. Direct shear experiments were conducted on intact granite samples from the Beishan underground research laboratory under two stress paths respectively with lateral stress greater and smaller than the normal stress. Additionally, the influence of loading and unloading paths on triaxial direct shear behaviors at the residual stage was investigated through multi-stage shear experiments. It shows the peak shear strength experiences an increase of 11.3 ∼ 38.1 % when the lateral stress increases from 5 MPa to 35 MPa. Furthermore, the roughness of rock fracture surfaces was also affected importantly by the lateral stress. At multiple scales, increasing lateral stress expands the tensile fracture range, enhancing rock brittleness. When normal stress is 20 MPa, the increase of lateral stress from 5 MPa to 35 MPa reduces the brittle coefficient from approximately 5.40 to 3.80. Additionally, the effect of lateral stress on residual strength is closely tied to the contact state of the fractured rock surface, and in multi-stage tests, when lateral stress exceeds normal stress, the shear strength during lateral stress unloading consistently surpasses that during loading. The findings quantified the effect of lateral stress on the direct shear properties of rocks and can provide a reference for modifying the rock strength and deformability in the stability evaluation of deep hard rock openings.

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引用次数: 0

Progressive failure and fracture characteristics of coral reef limestone under triaxial compression

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-16 DOI: 10.1016/j.engfracmech.2025.110948

Jun Xu , Zixin Zhang , Xin Huang

Coral reef limestone (CRL) is a distinctive type of rock formation characterized by a highly developed pore structure that exhibits inherent anisotropy, resulting in mechanical behaviors that differ from traditional terrestrial limestone. This study investigates the mechanical properties and progressive failure characteristics of two types of CRL: one with fine pores (CRF) and the other with coarse pores (CRC), using triaxial compression tests combined with CT scanning techniques. The study explores the influence of pore structure characteristics and discusses differences in microstructure, mechanical properties, and failure modes between coral reef limestone and terrestrial limestone. The results reveal that the stress–strain behavior of CRL exhibits distinct multi-peaks and relatively high residual strength, following a recurring four-stage failure phenomenon attributed to the continuous load-bearing of the residual skeleton. The peak strength of CRF is positively correlated with density and confining pressure, while CRC exhibits a stronger structural dependence, with peak strength and longitudinal wave velocity significantly influenced by the inclination angle of growth lines. CRF tends to fail in regions with a dense distribution of pores, resulting in a complex crack network, while CRC’s failure is concentrated in weak zones between large defects and growth lines. By defining multi-stage damage factors, the study quantifies the damage extent at each stage, which correlates with the number of main cracks. These findings provide new insights into the failure mechanisms of coral reef limestone in complex stress environments and offer important theoretical support for related engineering design.

珊瑚礁石灰岩（Coral reef limestone，CRL）是一种独特的岩层类型，其特点是孔隙结构高度发达，表现出固有的各向异性，导致其力学行为不同于传统的陆地石灰岩。本研究采用三轴压缩试验和 CT 扫描技术，研究了两种 CRL 的力学性能和渐进破坏特征：一种是细孔（CRF），另一种是粗孔（CRC）。研究探讨了孔隙结构特征的影响，并讨论了珊瑚礁石灰岩和陆地石灰岩在微观结构、机械性能和破坏模式方面的差异。研究结果表明，珊瑚礁石灰岩的应力-应变行为表现出明显的多峰值和相对较高的残余强度，其四级破坏现象反复出现，这归因于残余骨架的连续承载。CRF 的峰值强度与密度和约束压力呈正相关，而 CRC 则表现出更强的结构依赖性，峰值强度和纵波速度受生长线倾角的显著影响。CRF 往往在孔隙分布密集的区域失效，从而形成复杂的裂纹网络，而 CRC 的失效则集中在大缺陷和生长线之间的薄弱区域。通过定义多阶段损伤因子，该研究量化了每个阶段的损伤程度，这与主要裂纹的数量相关。这些发现为珊瑚礁石灰岩在复杂应力环境下的破坏机制提供了新的见解，并为相关工程设计提供了重要的理论支持。

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引用次数: 0

Investigation of chloride ion diffusion mechanism and durability analysis of offshore concrete structures under fatigue loading

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-16 DOI: 10.1016/j.engfracmech.2025.110942

Xubing Xu , Yonglai Zheng , Chenyu Hou , Xin Lan , Tanbo Pan , Zhengxie Zhang

This study examines the diffusion behavior of chloride ions in damaged concrete under fatigue loading, focusing on the influence of fatigue cycles and stress levels on chloride ion diffusion. Cyclic loading and NaCl solution immersion tests were performed at various stress levels to measure chloride ion concentrations at different depths within the damaged concrete. Based on experimental data, a two-dimensional chloride ion diffusion model was developed and validated using numerical simulations to evaluate the influence of crack width and depth on the diffusion coefficient. The results indicate that fatigue-induced cracks significantly enhance chloride ion penetration, with the diffusion coefficient increasing by up to 2.45 times under high stress levels (f/f_u = 0.6). CT scans showed that wider and deeper cracks facilitated chloride ion transport by expanding the crack-affected zone and transitioning the diffusion mechanism from one-dimensional to two-dimensional transport. The validated two-dimensional diffusion model offers potential for accurately predicting chloride ion ingress in offshore concrete structures. These findings contribute to improving the durability assessment and maintenance strategies for marine infrastructure.

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引用次数: 0

Investigation of damage and fracture in inert shell–solid propellant double-layered plates under projectile impact

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-14 DOI: 10.1016/j.engfracmech.2025.110927

Yiming Zhang , Junjie Wen , Ningfei Wang , Hanqing Xia , Ran Wang , Yanlei Shang , Yi Wu

The response of solid rocket motors to fragment impacts is critical for ensuring their safety in applications such as aerospace propulsion. The damage and fracture characteristics of the double-layer plates, including solid propellant, were investigated through impact experiments using spherical projectiles. The experiments comprehensively captured projectile penetration and the propellant damage process. Particular attention was given to the effects of the impact velocity and inert plate materials on the damage of a double-layer plate. The results showed that the impact velocity of a projectile is positively correlated with the number and velocity of fragments created by impact. Compared with that of the steel plate, the ignition of a carbon fiber plate required a lower impact velocity (approximately 1167–1518 m/s). The variation in impact velocity alters the internal damage mechanism of the propellant from interfacial debonding to particle fragmentation, and the equivalent diameter of the pore area in the propellant samples initially decreases and subsequently increases along the impact direction. Combined with the Lambert and Jonas model, a projectile penetration model using the smoothed particle hydrodynamics (SPH) method was established to quantitatively assess the impact process of projectiles. The model was validated in cases with different projectile impact velocities and inert plate materials. The results indicated that the deviation between the residual projectile velocity in the experiment and the simulated values was within 15 %.

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引用次数: 0

A two-stage surface fatigue crack propagation model of welded joint based on generalized structural stress

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-14 DOI: 10.1016/j.engfracmech.2025.110928

Chao Wang, Tao Zhu, Shoune Xiao, Bing Yang, Guangwu Yang

This work proposes a fracture mechanics model for fatigue crack propagation on the surface of welded structures using generalized structural stress. The model considers the impact of the weld profile on structural stress parameters. The whole process of crack propagation on the surface of welded joints is divided into two phases: shallow surface (a/t ≤ 0.2) and long crack (a/t > 0.2). The geometric modification coefficient F of fracture mechanics for different geometrical features of welded structures in tensile and bending load modes were calculated by multiple regression. The total thickness amplification factor M_kn is used to quantify the influence of the notch effect on the stress intensity factor (SIF) of shallow surface cracks. A unified fracture mechanics model explains the two stages of solving the dynamic SIF and the remaining life for surface cracks in welded joints. The results show that the model enhances the calculation accuracy of the SIF for welded joints, which is valuable for assessing the structural integrity and safety of welded joints.

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引用次数: 0

Fatigue damage evolution and failure mechanism in pre-corroded AlSi10Mg fabricated by laser powder bed fusion

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-02-13 DOI: 10.1016/j.engfracmech.2025.110926

Haipeng Song , Jianhe Ren , Sheng Jiang , Rubi Liang , Juan Du , Dinghe Li , Qian Zhang

This study investigates the fatigue damage evolution and failure mechanisms of pre-corroded AlSi10Mg alloy fabricated by laser powder bed fusion (L-PBF) through comprehensive multi-source experimental analyses. Combining techniques including 3D surface measurement, digital image correlation (DIC), and scanning electron microscopy (SEM), related experimental data on corrosion morphology, strain field evolution, and fracture characteristics were captured and correlated. Statistical and machine learning analysis on experimental data revealed that key factors, including corrosion level, surface roughness, and pit volume, significantly influence the location of macro-crack initiation. Five distinct micro-crack initiation mechanisms were identified, driven by a combination of corrosion morphology, internal manufacturing defects, underlying microstructures, localized embrittlement, and applied loading conditions. These findings provide critical insights into the interplay between corrosion features and fatigue failure in L-PBF AlSi10Mg alloy, offering valuable guidance for improving its mechanical properties in service environments.

{"title":"Fatigue damage evolution and failure mechanism in pre-corroded AlSi10Mg fabricated by laser powder bed fusion","authors":"Haipeng Song , Jianhe Ren , Sheng Jiang , Rubi Liang , Juan Du , Dinghe Li , Qian Zhang","doi":"10.1016/j.engfracmech.2025.110926","DOIUrl":"10.1016/j.engfracmech.2025.110926","url":null,"abstract":"<div><div>This study investigates the fatigue damage evolution and failure mechanisms of pre-corroded AlSi10Mg alloy fabricated by laser powder bed fusion (L-PBF) through comprehensive multi-source experimental analyses. Combining techniques including 3D surface measurement, digital image correlation (DIC), and scanning electron microscopy (SEM), related experimental data on corrosion morphology, strain field evolution, and fracture characteristics were captured and correlated. Statistical and machine learning analysis on experimental data revealed that key factors, including corrosion level, surface roughness, and pit volume, significantly influence the location of macro-crack initiation. Five distinct micro-crack initiation mechanisms were identified, driven by a combination of corrosion morphology, internal manufacturing defects, underlying microstructures, localized embrittlement, and applied loading conditions. These findings provide critical insights into the interplay between corrosion features and fatigue failure in L-PBF AlSi10Mg alloy, offering valuable guidance for improving its mechanical properties in service environments.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"317 ","pages":"Article 110926"},"PeriodicalIF":4.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444902","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

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