Engineering Fracture Mechanics最新文献

{"title":"On the pronounced mode dependency of the interface fracture toughness of pressureless sintered silver interconnects: Identification of dissipative micro-mechanisms","authors":"Noud P.T. Schoenmakers ,&nbsp;Johan P.M. Hoefnagels ,&nbsp;Edsger C.P. Smits ,&nbsp;Olaf van der Sluis","doi":"10.1016/j.engfracmech.2025.110860","DOIUrl":"10.1016/j.engfracmech.2025.110860","url":null,"abstract":"<div><div>The microscopic failure mechanisms contributing to the interface fracture toughness of two different pressureless sintered silver interconnects during mixed-mode delamination tests have been studied. Two sintered silver materials are used, one containing nanoparticles (NP) and one containing microflakes (<span><math><mi>μ</mi></math></span>F). The adhesives are sintered between two 35 × 5 mm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> copper plates electroplated with a silver backside metallisation layer. The fracture behaviour has been monitored under in-situ optical microscopy using the miniature mixed-mode bending setup, combined with post-mortem Scanning Electron Microscopy (SEM) fractography analysis. The significant difference in microstructure between the two interconnect materials results in a pronounced difference in failure behaviour, and resulting mixed-mode interface fracture toughness. The two main competing failure mechanisms are interface delamination and bulk fracture. The NP-interconnect exhibits the typical increase in interface fracture toughness with increasing mode angle, whilst the <span><math><mi>μ</mi></math></span>F-interconnect shows a never reported before dependency, having a global minimum. The fracture morphologies of the delaminated samples are analysed to explain the difference in failure behaviour using Scanning Electron Microscope (SEM) images. This study offers valuable insights into the complex interplay between the microstructures of the interconnect, failure mechanisms, and the resulting interface fracture toughness.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110860"},"PeriodicalIF":4.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143266135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and damage-coupled crystal plasticity constitutive study for solder ball under shear tests","authors":"Lu Liu ,&nbsp;Huachen Yu ,&nbsp;Yang Li ,&nbsp;Zhigang He ,&nbsp;Shoukun Huang ,&nbsp;Zhikuang Cai ,&nbsp;Xu He ,&nbsp;Yao Yao","doi":"10.1016/j.engfracmech.2025.110898","DOIUrl":"10.1016/j.engfracmech.2025.110898","url":null,"abstract":"<div><div>The experimental and multi-scale numerical investigation for solder ball under shear loads is studied in the present work. Shear tests are conducted on Sn-1.0Ag-0.5Cu solder balls at temperatures of 25℃, 100℃, and 150℃, and velocities of 50 µm/s, 100 µm/s, and 200 µm/s, respectively. Analysis of the experimental data using the Gaussian regression approach is performed to investigate the impact of temperature and shear velocity on peak shear force. The dominated ductile fracture is then determined through analyzing fracture surface and shear force–displacement curve. Furthermore, a 2D crystal plasticity finite element (CPFE) model is proposed to illustrate the ductile fracture process of solder ball. The solder ball is postulated to be consisted of various oriented <em>β</em>-Sn grains, controlled by a developed damage-coupled crystal plasticity model at finite strain conditions. The validity of CPFE model is substantiated by comparing the modelling shear force–displacement curves with the corresponding experimental data. The results demonstrate that the proposed model can provide a satisfactory depiction of solder ball under shear test. The influences of damage parameters on stress–strain curve and damage evolution behavior are investigated. The evolution of damage variable and stress/strain distribution at different positions of solder ball under shear tests are discussed.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110898"},"PeriodicalIF":4.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372051","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":"Fatigue damage accumulation model of a High-Pressure oil pipe based on fatigue probability under Multi-Level cyclic loading","authors":"Kong Chen ,&nbsp;Jin Jiangshan ,&nbsp;Lin Kangbo ,&nbsp;Jiang Yiwei ,&nbsp;Chen Sitong","doi":"10.1016/j.engfracmech.2025.110899","DOIUrl":"10.1016/j.engfracmech.2025.110899","url":null,"abstract":"<div><div>Engineering components are often experienced variable amplitude cyclic loading during operation, making them susceptible to fatigue failure. Existing fatigue damage models are limited to laboratory research, with limited representation of key components of marine diesel engines. This study examines a Q345B high-pressure oil pipe (HOP). Based on a HOP fatigue life dispersion analysis and fatigue damage characterization, a fatigue damage accumulation model for multi-level cyclic loading and a method for calculating the remaining useful life are proposed. The proposed model considers fatigue life dispersion, loading sequence, and interaction effects. Experimental results verify the accuracy of the proposed model.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110899"},"PeriodicalIF":4.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372098","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":"Damage evaluation of gravity dams reinforced by corrugated steel–concrete slab composite structures under underwater near-field explosion","authors":"Kelei Cao ,&nbsp;Qiaofeng Fu ,&nbsp;Jianwei Zhang ,&nbsp;Jinlin Huang ,&nbsp;Benbo Sun ,&nbsp;Wenchang Ma","doi":"10.1016/j.engfracmech.2025.110893","DOIUrl":"10.1016/j.engfracmech.2025.110893","url":null,"abstract":"<div><div>Concrete gravity dams reinforced by corrugated steel–concrete composite structures under blast loading conditions lead to different types of damage; however, the damage evolution and damage mode characteristics of a dam body do not adequately reflect the protective effect of a composite structure, and few scholars have evaluated the damage to gravity dams. Therefore, the damage to a concrete gravity dam reinforced by a composite structure is evaluated. An ALE algorithm is used to establish a simulation model for a concrete slab undergoing an air explosion. Then, the effectiveness of this numerical method is verified. The failure mode of a dam structure reinforced by a corrugated steel–concrete slab composite structure is explored, the anti-explosion protection effect of the composite structure is evaluated, and the damage to the gravity dam is predicted and evaluated. The results show that the ALE algorithm can effectively simulate the damage to a concrete slab in an air explosion test. The degree of damage to a concrete gravity dam after adding protection is significantly lower than that of an unprotected dam under different explosion factors. Moreover, the degree of damage increases with increasing explosive equivalent and decreases with increasing explosive detonation distance (detonation depth). Therefore, adding protection and increasing the detonation distance (detonation depth) can effectively improve the anti-explosion effect of a dam. Under different initiation factors, the damage area ratio is low after a protective layer is added. Hence, the added protection scheme can significantly improve the anti-explosion performance of a dam. Nonlinear prediction formulas for the crack depth ratio and damage area ratio of a dam, which characterize the damage characteristics of a dam body, can effectively predict the degree of damage to a gravity dam under different initiation factors and provide a theoretical reference for assessing damage to high-level concrete dam structures.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110893"},"PeriodicalIF":4.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388177","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":"Meso-mechanical characterization on thermal damage and low-temperature cracking of asphalt mixtures","authors":"Hao Wu ,&nbsp;Qian Li ,&nbsp;Weimin Song ,&nbsp;Xiaobao Chen ,&nbsp;Surajo Abubakar Wada ,&nbsp;Hongbo Liao","doi":"10.1016/j.engfracmech.2025.110862","DOIUrl":"10.1016/j.engfracmech.2025.110862","url":null,"abstract":"<div><div>As temperature fluctuates, thermal stresses and heterogeneous strains emerge within the asphalt mortar and the interface between asphalt and aggregate in asphalt mixtures, especially under a low temperature domain. This study provides a comprehensive investigation on the characterization of thermal damage in asphalt mixtures and their evolutionary mechanisms from a mesoscale perspective. A 2D numerical model is established based on the bilinear cohesive zone model (CZM), and the cohesive strength (<em>σ_c⁰</em>) and adhesive strength (<em>σ_a⁰</em>) were quantified with pull-off tests and image recognition technology to accurately represent the material’s properties at the mesoscale. On the other hand, the cohesive fracture energy (<em>G_c^C</em>) and adhesive fracture energy (<em>G_a^C</em>) are determined based on the laboratory and simulation results from the semi-circular bending (SCB) tests. Furthermore, the model is verified to be effective to characterize the thermal damage and low-temperature cracking of asphalt mixtures with the thermal stress restrained specimen test (TSRST). The findings reveal that the numerical model established in the study is effective to characterize the low-temperature damage of asphalt mixtures. The transition zones between asphalt and aggregate, as well as the edges of voids or defects, are particularly vulnerable to low-temperature damage under the thermal stress and strain. By decomposing strains and linking them to stress for analysis, a more detailed description of the thermal damage and failure mechanisms of the asphalt-aggregate interface and asphalt mortar within asphalt mixtures has been elucidated. During temperature variation, asphalt mortar experiences a substantially higher total strain than aggregate, contributing to a continuous growth of thermal stress inside of the asphalt mixture. The cohesive damage within the asphalt mortar is dominant compared to adhesive damage on the interface between asphalt and aggregate, whereas thermal damage on the interface can also be perceived in some regions due to stress concentration and accumulation, especially at the stage of cracking initiation.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110862"},"PeriodicalIF":4.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372097","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":"Data-driven nonlocal damage mechanics and fracture of shells","authors":"Daoping Liu ,&nbsp;Xuejiao Shao ,&nbsp;Xiaolong Fu ,&nbsp;Cong Chen ,&nbsp;K.I. Elkhodary ,&nbsp;Shan Tang","doi":"10.1016/j.engfracmech.2025.110864","DOIUrl":"10.1016/j.engfracmech.2025.110864","url":null,"abstract":"<div><div>This paper proposes a data-driven modeling approach to address the problem of fracture in plates and shells, based on damage mechanics. The fracture problem today faces difficulties in simulating the non-local effects associated with microstructural features of comparable scale to plate thickness, setting corresponding criteria for crack initiation and propagation, and describing the subsequent evolution of damage. The inter-dependence of these three factors can result in very complicated modeling needs. To overcome these difficulties, a data-driven generalized yield function is herein proposed, which can account for the stress state, hardening parameters, and a local second-order gradient of plastic strain and damage. Specifically, prior material knowledge is harnessed to identify key features from its mechanical data to define a generalized yield surface. Next, by training neural networks, a quantitative description of the yielding surface is generated so that complex material behaviors can be described. The yield function learned through this data-driven approach is subsequently implemented into a finite element framework. The implementation is finally utilized to analyze size-dependent fracture of plates and shells. The reliability of the proposed method is validated through the several representative cases, demonstrating its potential to describe complex fracture patterns in plates and shells. Limitations of the proposed approach are also discussed.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110864"},"PeriodicalIF":4.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143266136","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":"Synergistic design of curved beam metastructure with tunable nonlinearity deformation and Poisson’s ratio","authors":"Gai-Qin Liu,&nbsp;Hai-Tao Liu","doi":"10.1016/j.engfracmech.2025.110897","DOIUrl":"10.1016/j.engfracmech.2025.110897","url":null,"abstract":"<div><div>Mechanical metastructures have gained extensive attention owing to their preeminent mechanical properties. However, how to effectively and conveniently design metastructures with tunable nonlinearity mechanical behaviors remains a fundamental yet unexplored challenge. In this study, two types of curved beam metastructure (CBM) are proposed, referred to as the single curved beam metastructure (SCBM) and double curved beam metastructure (DCBM). The Poisson’s ratio, load-bearing capacity, and energy absorption characteristics of CBM are explored through numerical simulations and experiments. The results show that SCBM and DCBM not only provide exceptional flexibility, exhibiting various nonlinearity characteristics such as negative stiffness, bi-stable, quasi-zero stiffness (QZS), and positive stiffness, but also possess the unique ability to switch the Poisson’s ratio sign. Additionally, multiple deformation modes can be tailored by introducing gradient design, allowing for controlled and orderly transformation between these modes. The outstanding nonlinearity characteristics of CBM make them ideal for designing multifunctional structures. This study offers a novel approach for the tunable design of nonlinearity deformation and Poisson’s ratio, promoting the application of tunable CBM in fields such as aerospace and automotive engineering.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110897"},"PeriodicalIF":4.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350275","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":"Mechanical behavior and failure mechanism study of CFRP laminate page-type adhesive joint","authors":"Mo Yang ,&nbsp;Jianan Xi ,&nbsp;Hao Xuan ,&nbsp;Yikun Wang ,&nbsp;Wen Zhang","doi":"10.1016/j.engfracmech.2025.110895","DOIUrl":"10.1016/j.engfracmech.2025.110895","url":null,"abstract":"<div><div>The application of adhesive bonding is becoming increasingly prevalent in the automotive, marine, and aerospace industries, aimed at enhancing structural performance and reducing weight. The mechanical behavior of adhesively bonded composite joints is significantly influenced by the joint structure. This study introduces a novel adhesive joint structure, referred to as the page-type adhesive joint (PTAJ). A finite element analysis (FEA) model, employing the Hashin failure criterion and cohesive zone model, has been developed to investigate the mechanical behavior and failure mechanisms of the PTAJ. Additionally, tensile strength tests were conducted on PTAJs to validate the integrated FEA approach. The results indicate that the PTAJ experiences both cohesive damage and CFRP tearing damage under tensile load, with the ratio of these failure modes varying according to different lap lengths. Short joint lengths primarily fail in the adhesive layer, while longer joint lengths exhibit CFRP tearing damage as the predominant failure mode. Furthermore, the tensile strength of the single lap joints (SLJs) is compared with that of the PTAJs. The tensile strength of the PTAJs is over four times that of the SLJs across various lap lengths. The findings of this study present a new high-performance adhesive structure for composite joints.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110895"},"PeriodicalIF":4.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350276","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 fracture mechanics model for predicting tensile strength and fracture toughness of 3D printed engineered cementitious composites (3DP-ECC)","authors":"Wenguang Chen ,&nbsp;Long Liang ,&nbsp;Boyang Zhou ,&nbsp;Junhong Ye ,&nbsp;Xinjian Sun ,&nbsp;Jiaxing Ma ,&nbsp;Jiangtao Yu ,&nbsp;Kequan Yu","doi":"10.1016/j.engfracmech.2025.110894","DOIUrl":"10.1016/j.engfracmech.2025.110894","url":null,"abstract":"<div><div>Engineered cementitious composites (ECC) has emerged as a promising self-reinforced material for 3D printed concrete structures, which could potentially remove the dependence on steel reinforcement. The interfacial crack resistance of 3D printed ECC (3DP-ECC) should be emphasized due to the inherent layered stacking process. Tensile strength and fracture toughness are two critical fracture parameters in describing the crack resistance. Determining realistic fracture parameters is crucial for guiding structural safety design. This study aims to develop a fracture mechanics model for determining the size-independent interfacial tensile strength and fracture toughness of 3DP-ECC based on boundary effect model (BEM). Firstly, the interfacial fracture behavior of 3DP-ECC was experimentally investigated by three-point bending tests. A fracture mechanics model was subsequently proposed to predict the size-independent tensile strength and fracture toughness by incorporating the material heterogeneity and discontinuity. The results show that the interfacial tensile strength and fracture toughness of 3DP-ECC could be extrapolated analytically once the peak load was obtained by the three-point bending fracture test, and the predicted values of tensile strength and fracture toughness were proved to follow normal distribution. Additionally, the peak load prediction lines and fracture failure curves with 95 % confidence interval for 3DP-ECC were further constructed using the determined fracture parameters, demonstrating good accuracy and reliability. This work offers a theoretical basis for the safe and reasonable design of 3DP-ECC structural members.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110894"},"PeriodicalIF":4.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143266203","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":"Mesoscale modelling of RC beams without stirrups in shear failure using discrete element method","authors":"Xupeng Pan ,&nbsp;Yizhen Wu ,&nbsp;Pingming Huang ,&nbsp;Yu Zhao ,&nbsp;Yangguang Yuan ,&nbsp;Yamin Sun","doi":"10.1016/j.engfracmech.2025.110881","DOIUrl":"10.1016/j.engfracmech.2025.110881","url":null,"abstract":"<div><div>To investigate the mesoscale failure behaviour of reinforced concrete (RC) beams without stirrups, a novel approach using discrete element method (DEM) is proposed for efficiently generation of mesoscale fracture numerical models of RC beams. In this method, the coarse aggregate, whose realistic shape determined by calling the ‘Aggregate Geometry Library’, is constructed using the crushable clustered particles method. Then, a soft bond model is introduced to represent the constitutive model of concrete. In addition, a new mesoscale contact model of hard bond model developed from soft bond model is used to capture the mechanical behaviour of steel bars. Based on the validated DEM model, a series of numerical simulations are conducted to investigate the shear failure behaviour of RC beams as well as the effects of shear-span ratio and elastic modulus of steel bars on the ultimate shear capacity. The results show that the microcracks in RC beams are commonly propagation along the interfacial transition zone (ITZ), whereas aggregate crushing is rarely observed. The number of microcracks in the ITZ component is accounting for 60% and increases slightly with increasing shear-span ratio, which largely contribute to the failure of the RC beams. According to the numerical simulation results, a Zsutty modified formula is proposed for shear capacity evaluation and the performance is validated by 150 tests in the experimental database. For the beams of shear-span ratios low than 2.5, the mean values and coefficient of variation are 1.13 and 26.7%, respectively.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110881"},"PeriodicalIF":4.7,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143348012","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}