Engineering Fracture Mechanics最新文献

{"title":"Rupture directivity and poroelastic coupling in earthquakes induced by fluid injection","authors":"Sandro Andrés ,&nbsp;David Santillán ,&nbsp;Juan Carlos Mosquera ,&nbsp;Luis Cueto-Felgueroso","doi":"10.1016/j.engfracmech.2025.111123","DOIUrl":"10.1016/j.engfracmech.2025.111123","url":null,"abstract":"<div><div>Earthquakes induced by the human-made injection or extraction of fluids have recently become a major concern in energy technologies. When frictional and hydromechanical conditions lead to fault reactivation, unstable slip can occur and rupture propagates across the fault with a pattern analogous to two crack tips, spreading away from the hypocenter. During the earthquake the rupture tips can propagate symmetrically or along a preferred direction. These propagation patterns are related with the effects of the earthquake, and are essential due to the predominance of almost-unilateral ruptures in large earthquakes catalogs.</div><div>We study how poroelastic coupling controls the directivity of the rupture in earthquakes induced by pore pressure changes. The directivity patterns observed in earthquakes ruptures may be explained by a contrast in material properties across the fault as previous studies have shown. Here we show that rupture asymmetries may be also promoted by the pressure and stress changes induced by fluid injection prior to rupture, together with the undrained pressure response during coseismic slip. We employ fully coupled hydromechanical simulations of poroelastic media with rate-and-state faults, and analytical solutions to perform a dimensionless analysis. We observe that, depending on the flow conditions and the initial fault stress state, directivity patterns range from almost-symmetric to almost-unilateral.</div><div>We explain the rupture directivity pattern in terms of the conditions of fault confinement and pore pressure diffusion, and identify two mechanisms that control the symmetry of the earthquake rupture. Firstly, the pore pressure distribution prior to earthquake, which depends on the distance between the injection well and the fault, controls the heterogeneity of fault strength along the fault. Secondly, the undrained effect due to coseismic fault slip, which is directly related to the initial confinement, causes an increase or decrease of pore pressure on either side of the fault.</div><div>Our results contribute to understand the impact of poroelasticity on rupture directivity in injection-induced earthquakes and offer a feasible explanation of almost-unilateral rupture patterns.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"322 ","pages":"Article 111123"},"PeriodicalIF":4.7,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864467","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}

{"title":"Magnetic flux leakage testing based on the dual testing probes resisting the negative effects of lift-off perturbations","authors":"Shuai Hao ,&nbsp;Peng-Peng Shi ,&nbsp;San-Qing Su","doi":"10.1016/j.engfracmech.2025.111141","DOIUrl":"10.1016/j.engfracmech.2025.111141","url":null,"abstract":"<div><div>The traditional defect evaluation method for magnetic leakage flux (MFL) testing is based on the calibration relationship of signal characteristics on a given lift-off value. The unavoidable lift-off perturbations during the testing process cause changes in the collected MFL signals, leading to challenges in the quantitative evaluation of defect sizes by the traditional method. To address this, we propose an MFL testing system with dual testing probes to test signals containing lift-off information, and develop related algorithms with the Regulargridinterpolator function and particle swarm optimization method to achieve joint high-precision evaluation for radius and depth of defect in the presence of lift-off perturbations. Unlike the single testing probe used in the traditional evaluation method, stacked dual testing probes with a given lift-off difference and a self-developed experimental system for the MFL testing are prepared and optimized, realizing the jointly automatic and continuous acquisition of two sets of signals with a given lift-off difference. Then, the testing experiment of Q235 steel plate containing surface round hole defects (defect radius and depth are 2 mm ∼ 5 mm and 1 mm ∼ 5 mm) is executed, and the experimental results combined with the magnetic dipole model show that both sets of signals are positively correlated with the defect size and closely related to the lift-off value. In addition, the proposed defect evaluation algorithm is used to jointly quantitatively evaluate the radius and depth of surface round hole defects based on the collected MFL testing signals, where the prediction error of defect size based on dual testing probes is controlled within 0.4 mm, indicating that the evaluation capability is significantly higher than that from the traditional evaluation method based on the single testing probe in the presence of lift-off perturbations. The proposed method is demonstrated to resist the negative effects of lift-off perturbations, providing a pathway for the quantitative evaluation of defects under complex testing conditions.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111141"},"PeriodicalIF":4.7,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860594","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}

{"title":"Evaluation of ductile fracture toughness for Mode I cracks subject to three-dimensional constraint conditions","authors":"Simiao Yu ,&nbsp;Lixun Cai ,&nbsp;Hui Chen","doi":"10.1016/j.engfracmech.2025.111157","DOIUrl":"10.1016/j.engfracmech.2025.111157","url":null,"abstract":"<div><div>Evaluating the properties related to the fracture mechanics and behavior of cracked structures is pivotal in structural integrity analysis. Accurate theoretical predictions and experimental methods for determining fracture toughness are significant in advancing the fracture strength theory of ductile materials and addressing fracture-related issues in such structures. This study developed models that reflect the dimensionless relationships among load, <em>J</em>-integral, maximum principal stress, and stress triaxiality for Mode I cracked specimens under three-dimensional constraints. These models are developed for ductile materials conforming to the Ramberg–Osgood law based on energy density equivalence and finite element analysis. Combined with the critical fracture criterion under high constraints, an effective method for quantitatively evaluating the fracture toughness of Mode I cracks under three-dimensional constraints was established. Notably, the trends observed in the derived critical <em>J</em>-integral vs. thickness relations align with conventional fracture test results. This research can aid in the accurate predictions of the fracture behavior for ductile structural materials under differing levels of crack tip constraint.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"322 ","pages":"Article 111157"},"PeriodicalIF":4.7,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874596","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}

{"title":"Corrigendum to “Electrode crack evolution and failure mechanism during calendering: Insights from discrete element method-based mesoscopic simulation” [Eng. Fract. Mech. 321 (2025) 111120]","authors":"Yuhang Lyu ,&nbsp;Shaohai Dong ,&nbsp;Tao Zhang ,&nbsp;Zhan-Sheng Guo","doi":"10.1016/j.engfracmech.2025.111150","DOIUrl":"10.1016/j.engfracmech.2025.111150","url":null,"abstract":"","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111150"},"PeriodicalIF":4.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916951","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}

{"title":"The effect of void shape on the ductile behavior of tension-compression asymmetric materials","authors":"Sarvenaz Hashem-Sharifi ,&nbsp;Navab Hosseini ,&nbsp;Guadalupe Vadillo","doi":"10.1016/j.engfracmech.2025.111106","DOIUrl":"10.1016/j.engfracmech.2025.111106","url":null,"abstract":"<div><div>This paper presents an in-depth investigation into how matrix tension-compression asymmetry and initial void shape impact the ductile behavior of porous materials, offering new insights that have not been explored in previous studies. To achieve this, finite element computations in ABAQUS/Standard are used to model three-dimensional unit cells with various void shapes -spherical, oblate, and prolate- embedded in a matrix material characterized by the CPB06 constitutive model, implemented via a UMAT user subroutine. The simulations span a range of stress states with variations in stress triaxiality from 0 to 2 and Lode parameter from −1 to 1, focusing on the evolution of void volume fraction and void geometry. The findings indicate that, while the initial yield locus is found to be similar for spherical and non-spherical (oblate and prolate) voids, significant variations in void growth and shape evolution occur depending on the void shape. Non-spherical voids, especially in materials with pronounced tension-compression asymmetry, exhibit significantly different growth patterns and morphological changes when compared with the spherical case.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"322 ","pages":"Article 111106"},"PeriodicalIF":4.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874594","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}

{"title":"A novel structural stress method and stress intensity factor solutions for fatigue analysis of high-strength bolted connections in bolted spherical joints","authors":"Saicong Guo,&nbsp;Xuanzhe Ji,&nbsp;Guoqing Wang,&nbsp;Xiaoling Liu,&nbsp;Hanchao Liu,&nbsp;Honggang Lei","doi":"10.1016/j.engfracmech.2025.111138","DOIUrl":"10.1016/j.engfracmech.2025.111138","url":null,"abstract":"<div><div>Both bolted connections and welded joints in construction engineering are susceptible to fatigue fracture. While the structural stress method has been relatively well-established for evaluating the fatigue behavior of welded joints, it remains unexplored for high-strength bolted connections. This paper presents a novel definition of structural stress and corresponding numerical methods for the fatigue analysis of high-strength bolted connections, based on the equilibrium equations of force and moment. The structural stress, composed of membrane and bending stresses, has shown significant insensitivity to element type and mesh size in both axisymmetric and three-dimensional solid models of bolted spherical joints. On this basis, stress intensity factor (SIF) solutions for bolt cracks based on structural stress have been proposed. This approach decomposes the SIF into membrane and bending stress components, allowing for the quantification of their individual contributions to fatigue life while also considering the effects of bolt specifications. Subsequently, the effects of bolt screwing depth and diameter on stress concentration and fatigue life were discussed. Research indicates that structural stress, which considers stress concentration and loading pattern, consolidates fatigue data across various screwing depths into a narrow range. The structural stress-based SIF considers the effects of stress concentration, bolt specification, and loading pattern, consolidating fatigue data from bolts with varying screwing depths and diameters into a narrow range, with a correlation coefficient of 0.862 and a standard deviation of 0.161. This study provides novel methods and insights for the fatigue assessment of high-strength bolts.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111138"},"PeriodicalIF":4.7,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860316","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}

{"title":"Analytical solution for the stress fields of a hypocycloidal hole with two radial cracks in an infinite plate","authors":"Shengfan Bi,&nbsp;Xiaoting Cui,&nbsp;Yong Huang,&nbsp;Hao Wang","doi":"10.1016/j.engfracmech.2025.111134","DOIUrl":"10.1016/j.engfracmech.2025.111134","url":null,"abstract":"<div><div>Hole structures are widely utilized in engineering applications. Edge cracks may form around holes during manufacturing or operation, potentially leading to structural failure. This study investigates the problem of unequal radial cracks emanating from a hypocycloid-shaped hole in a two-dimensional isotropic infinite plate. Using the Muskhelishvili approach and conformal mapping, a general solution is derived for cracked deltoid and astroid holes. The analytical theory is validated through finite element simulations, with numerical examples for both single-sided and double-sided radial cracks. The effects of crack length and hypocycloid geometry on the stress intensity factor (SIF) are investigated. Under uniaxial tension, an increase in crack length raises the SIF for both the corresponding and opposite crack tips. Due to geometric differences at the crack initiation location, cracks emanating from the cusps of a deltoid hole exhibit reduced sensitivity of SIF to crack length compared to cracks emanating from smoother hole edges.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111134"},"PeriodicalIF":4.7,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855441","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}

{"title":"Research on the mechanical behavior of GLARE laminates under combined tensile-torsion","authors":"Ying Ai ,&nbsp;Jiucheng Zhao ,&nbsp;Liya Tian ,&nbsp;Shanyue Guan ,&nbsp;Zerui Zhao ,&nbsp;Xiangyu Zong ,&nbsp;Shizhong Zhang ,&nbsp;Hongwei Zhao","doi":"10.1016/j.engfracmech.2025.111142","DOIUrl":"10.1016/j.engfracmech.2025.111142","url":null,"abstract":"<div><div>Fiber metal laminates (FMLs) are extensively utilized as materials for fuselage skin panels in aircraft. Throughout the service life of an aircraft, these fuselage panels endure a range of complex loads, including tensile, bending, and torsional forces. The deformation and damage resulting from these complex loads lead to intricate failure mechanisms. To understand the damage and failure patterns of FMLs under such conditions, this study aims to investigate the mechanical behavior of glass fiber reinforced aluminum laminates (GLARE) under combined tensile-torsion (CTT) loads. The findings reveal that applying pre-torsion to the material significantly reduces its tensile properties. Specifically, when the material is subjected to a pre-torsion-tension (PTO) condition with a 45° pre-torsion angle, the material’s maximum tensile load decreases by 27.7 %, tensile strength drops by 27.6 %, and tensile strain declines by 44.9 % compared to pure tension. Conversely, when the material is subjected to a pre-tension–torsion (PTE) condition with a 500 N pre-tension load, the material’s maximum torque increases by 93.4 % compared to pure torsion. Additionally, when the material is subjected to a PTE condition with a 1500 N pre-tension load, the torsional stiffness rises by 29.3 %, while the torsional angle corresponding to the maximum torque decreases by 74.5 %. To further analyze these effects, digital image correlation (DIC) was used to monitor the distribution and evolutionary trend of strain on the specimen surface under different loading conditions. Scanning electron microscopy (SEM) was used to characterize the damage patterns in the fracture region of the specimens under different conditions. This research provides insights into the reliability assessment and structural optimization design of GLARE laminates, contributing to the advancement of materials used in aerospace applications.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111142"},"PeriodicalIF":4.7,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865015","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}

{"title":"Evaluation of low-temperature fracture and damage of asphalt concrete using SCB test combined with DIC","authors":"Shangshu Zhu ,&nbsp;Zhengfeng Zhou ,&nbsp;Ze Zhang ,&nbsp;Zhenqi Liu ,&nbsp;Xiao Hou","doi":"10.1016/j.engfracmech.2025.111135","DOIUrl":"10.1016/j.engfracmech.2025.111135","url":null,"abstract":"<div><div>This study presents a method for assessing low-temperature damage and cracking in asphalt concrete by monitoring the surface displacement of semicircular bending (SCB) specimens during loading using digital image correlation (DIC) technology. The inflection point on the load line displacement (LLD)-crack tip opening displacement (CTOD) curve is used to identify the damage initiation, while the macroscopic crack morphology is employed to determine the critical fracture point. Based on the crack opening displacement measured along the crack propagation zone, damage evolution is quantified combining the linear softening cohesive zone model (CZM). Local and global damage factors are introduced to characterize the damage process. The results indicate that damage of asphalt concrete initiates before the peak load, occurring at approximately 90 % of the peak load at −10 °C. The horizontal displacement along vertical characteristic lines above the notch effectively evaluates the crack propagation behavior, providing a reliable approach for damage quantification in asphalt concrete.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111135"},"PeriodicalIF":4.7,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842919","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}

{"title":"The state-of-art in studies on brittle crack arrest in steel","authors":"Fuminori Yanagimoto ,&nbsp;Tianyu He ,&nbsp;Kazuki Shibanuma","doi":"10.1016/j.engfracmech.2025.111132","DOIUrl":"10.1016/j.engfracmech.2025.111132","url":null,"abstract":"<div><div>Brittle crack propagation and arrest behavior in steel plates has been studied to prevent catastrophic failures in large steel structures. Despite a long history of research, this behavior remains complex and is challenging to fully understand due to its instantaneous nature and sensitivity to multiple influencing factors. Over the past two decades, advancements in numerical and experimental studies have greatly enhanced our understanding of crack propagation, with serval studies on crack arrest control contributing to improved structural integrity. For insight of future direction of brittle crack arrest studies, this review comprehensively introduces full-length articles on brittle crack propagation and arrest, focusing on test methods, including correlations between small and large specimen testing, as well as numerical, experimental, and theoretical approaches. In particular, the review emphasizes the local approach focused on a crack tip stress field, considering a promising method for explaining brittle crack propagation and arrest behavior. Additionally, this manuscript reviewed material and structural designs for brittle crack arrest, providing insights into methods for controlling brittle crack propagation in actual steel structures.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"323 ","pages":"Article 111132"},"PeriodicalIF":4.7,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937603","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}