Engineering Fracture Mechanics最新文献

{"title":"Improving the fatigue life of thin plates with small-spacing adjacent double holes with electromagnetic process","authors":"Lixia Ouyang ,&nbsp;Xiang Chen ,&nbsp;Qi Zhao ,&nbsp;Chun Zhang ,&nbsp;Jinfeng Wang ,&nbsp;Xiaofei Xu ,&nbsp;Huihui Geng ,&nbsp;Shaowei Ouyang ,&nbsp;Changxing Li","doi":"10.1016/j.engfracmech.2025.111056","DOIUrl":"10.1016/j.engfracmech.2025.111056","url":null,"abstract":"<div><div>The fatigue life of thin plates with small-spacing adjacent double holes processed using the electromagnetic cold expansion method was investigated with employing both numerical and experimental approaches. The results indicated that radial tensile stress is generated during electromagnetic processing, effectively preventing warping during the strengthening of thin plates. Importantly, uniformly distributed tangential compressive residual stress along the thickness direction near the holes was produced after the electromagnetic method. This distribution effectively mitigates the accumulation of crack sources in areas of low residual compressive stress under fatigue load. Furthermore, the depth of the compressive stress area in the radial direction was found to be 4–5 times greater than that achieved by conventional cold expansion methods. Fatigue testing further demonstrated the superior performance of the electromagnetic method, revealing a more than tenfold increase in fatigue life under an external load of <em>σ</em>_max = 100 MPa.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111056"},"PeriodicalIF":4.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716270","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":"An efficient explicit–implicit adaptive method for peridynamic modeling of quasi-static fracture formation and evolution","authors":"Shiwei Hu ,&nbsp;Tianbai Xiao ,&nbsp;Mingshuo Han ,&nbsp;Zuoxu Li ,&nbsp;Erkan Oterkus ,&nbsp;Selda Oterkus ,&nbsp;Yonghao Zhang","doi":"10.1016/j.engfracmech.2025.111046","DOIUrl":"10.1016/j.engfracmech.2025.111046","url":null,"abstract":"<div><div>Understanding the quasi-static fracture formation and evolution is essential for assessing the mechanical properties and structural load-bearing capacity of materials. Peridynamics (PD) provides an effective computational method to depict fracture mechanics. The explicit adaptive dynamic relaxation (ADR) method and the implicit methods are two mainstream PD approaches to simulate evolution of quasi-static fractures. However, no comprehensive and quantitative studies have been reported to compare their accuracy and efficiency. In this work, we first develop an implicit method for bond-based peridynamics (BBPD) based on the full nonlinear equilibrium equation and the degenerate form of the bond failure function, where the Jacobian matrices are derived using the Newton–Raphson (NR) scheme. Subsequently, we analyze the solvability of the implicit BBPD scheme. Second, a consistent and comprehensive comparison of accuracy and efficiency of the explicit ADR and implicit methods is conducted, which reveals computational efficiency of the implicit methods and their limitations in accurately describing crack formation. Finally, by utilizing the unique advantage of both methods, we develop an adaptive explicit–implicit method and propose a switching criterion to deploy appropriate scheme accordingly. Four typical quasi-static problems are employed as the numerical experiments, which show the acceleration ratios of the current method range from 6.4 to 141.7 when compared to the explicit ADR. Therefore, the explicit–implicit adaptive method provides a powerful method to simulate quasi-static fracture formation and evolution.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111046"},"PeriodicalIF":4.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715802","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 mechanics model for correlating notch toughness in Charpy impact tests with fracture toughness in cracked static fracture tests","authors":"Wei Jun Wong,&nbsp;Carey L. Walters","doi":"10.1016/j.engfracmech.2025.111043","DOIUrl":"10.1016/j.engfracmech.2025.111043","url":null,"abstract":"<div><div>Empirically derived Charpy energy to fracture toughness (<span><math><mi>J</mi></math></span>-integral) correlations are often used to estimate the fracture toughness of steels from Charpy tests due to the higher testing costs and time associated with direct fracture toughness tests, but analytical insight into these correlations is lacking. Accounting for differences in the strain rates and stress states in these tests to simulate the correct response in both while keeping model complexity and calibration effort manageable presents an obstacle to a numerical approach for this problem. This paper hence establishes a modelling and calibration approach that could be used to contribute mechanics-based insight into the correlations between the Charpy energy, <span><math><mi>J</mi></math></span>-integral, yield-to-tensile strength ratio and tensile test fracture elongation. A phenomenological rate-dependent plasticity model coupled with damage and temperature effects is developed by implementing the strain-based modified Mohr–Coulomb damage-softening model with Johnson–Cook thermal softening in a thermodynamically consistent Cowper–Symonds viscoplasticity model. The validity of the modelling framework is shown by its ability to simultaneously model the tensile test, the Charpy V-notch test and the precracked single-edge notched bending test. This is demonstrated for two steels, AH36 and S690QL, capturing the force–displacement responses and the characteristic ductile fracture mechanism of slant fracture in all three tests. Accounting for thermal softening due to adiabatic heating proves to be important for the accurate simulation of ductile Charpy tests involving high impact energies. Capitalising on weak triaxiality dependence in the middle-to-high triaxiality ranges in the given materials and adopting a triaxiality-independent assumption is found to be effective for reducing the damage model complexity while maintaining its ability to simulate the mechanical response in key tests covering an important range of stress states. The importance of the role of the Lode angle in ductile fracture modelling in weakly triaxiality-dependent regimes is further substantiated. Key similarities in the fracture behaviour of the Charpy and single-edge notched bending tests are identified: they span a similar range of stress states over a large range of their response despite the initial notched versus cracked difference—an insight that could be used to reduce the calibration effort of damage mechanics models for these tests, assuming that the key differentiating factors of rate-dependence and adiabatic heating are correctly accounted for.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111043"},"PeriodicalIF":4.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704544","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":"Accurate evaluation of fatigue life and study of initial crack effects in diesel engine cylinder blocks based on an accurate crack propagation model","authors":"Sijia Ren,&nbsp;Zhentao Liu","doi":"10.1016/j.engfracmech.2025.111058","DOIUrl":"10.1016/j.engfracmech.2025.111058","url":null,"abstract":"<div><div>Accurate assessment of the fatigue life (<em>N</em>_f) of diesel engine cylinder block partitions and the influence of initial cracks is essential for engine safety. However, the large size and complex geometry of these partitions complicate the development of a reliable crack growth rate (d<em>a</em>/d<em>N</em>) model. To address this, a scaling study was conducted to ensure consistent d<em>a</em>/d<em>N</em> behavior before and after scaling. Fatigue crack propagation (FCP) tests and simulations, accounting for crack closure effects, were performed on scaled components to obtain d<em>a</em>/d<em>N</em> and stress intensity factor (Δ<em>K</em>) data, which were then integrated to establish an indirect d<em>a</em>/d<em>N</em> model for the partitions. <em>N</em>_f simulation evaluation of the partition was conducted based on this model. Additionally, microscopic analysis and finite element modeling were used to assess initial crack conditions’ effects on FCP behavior and <em>N</em>_f. The results show that the proposed model reduces <em>N</em>_f prediction error by 10.2% compared to traditional methods, with Type I as the primary FCP mode. The bolt root center, a 30° crack angle, and a 1.4 aspect ratio were identified as critical factors in fracture.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111058"},"PeriodicalIF":4.7,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686809","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 phase-field study on thermo-mechanical coupled damage evolution and failure mechanisms of sintered silver interconnections","authors":"Yanpeng Gong ,&nbsp;Yuguo Kou ,&nbsp;Qiang Yue ,&nbsp;Xiaoying Zhuang ,&nbsp;Navid Valizadeh ,&nbsp;Fei Qin ,&nbsp;Qiao Wang ,&nbsp;Timon Rabczuk","doi":"10.1016/j.engfracmech.2025.111039","DOIUrl":"10.1016/j.engfracmech.2025.111039","url":null,"abstract":"<div><div>Sintered silver paste has emerged as one of the most promising green packaging interconnection materials in electronic packaging due to its combination of low-temperature processing and high-temperature service capabilities. At the microscale, sintered silver exhibits random porous structures influenced by sintering processes, leading to various fracture issues under complex operating conditions, where the mechanical reliability is significantly influenced by thermo-mechanical loading during service. This study establishes a thermo-mechanical coupled phase-field model incorporating mixed tensile–shear failure modes to investigate the mechanical behavior and fracture evolution of random porous structures reconstructed from SEM images of sintered silver. The phase-field approach effectively captures crack initiation and propagation without explicit crack tracking by introducing a regularized description of discontinuities. Numerical predictions of elastic modulus and tensile strength show good agreement with experimental results under various loading conditions, including tensile, shear, and end-notched flexure (ENF) tests. Simulations of crack propagation under thermal and shear loading conditions reveal distinctive crack patterns and complex crack networks. The proposed approach provides an efficient and reliable method for simulating the mechanical behavior and failure mechanisms of sintered silver solder with random porous structures, offering valuable insights for improving electronic package reliability.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111039"},"PeriodicalIF":4.7,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686802","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 “Uncertainty quantification of the reference temperature T0 of 16MND5 steel from experimental and numerical fracture toughness tests” [Eng. Fract. Mech. 315 (2025) 110755]","authors":"Anthony Quintin ,&nbsp;Tom Petit ,&nbsp;Rudy Chocat ,&nbsp;Cécile Mattrand ,&nbsp;Jean-Marc Bourinet","doi":"10.1016/j.engfracmech.2025.111038","DOIUrl":"10.1016/j.engfracmech.2025.111038","url":null,"abstract":"","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111038"},"PeriodicalIF":4.7,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761174","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":"A new uncoupled ductile fracture model considering the transition of fracture mechanism","authors":"Yuze Song,&nbsp;Yuhao Guo,&nbsp;Yun Teng,&nbsp;Gang Liu","doi":"10.1016/j.engfracmech.2025.111045","DOIUrl":"10.1016/j.engfracmech.2025.111045","url":null,"abstract":"<div><div>As stress triaxiality increases, the dominant ductile fracture mechanism transitions from shear-dominated behavior to void spherical expansion and necking coalescence. To consider this phenomenon, a new uncoupled ductile fracture model based on the micromechanisms of void nucleation, growth, and coalescence is proposed. The model adopts a piecewise function modeling strategy to account for the transition of fracture mechanism. Through a detailed analysis of the model variables, the physical significance of each parameter are clarified. Moreover, six different materials and two classic fracture models are used for verification of the prediction accuracy of the model, highlighting its advantages and material applicability.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111045"},"PeriodicalIF":4.7,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706285","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":"Phase field fracture simulation of early-age concrete based on chemo-thermo-hygro-mechanical theoretical framework","authors":"Jian Ding,&nbsp;Xin Wang,&nbsp;Zhiyuan Chen,&nbsp;Dengfeng Lu,&nbsp;Jingyang Zhou,&nbsp;Zhishen Wu","doi":"10.1016/j.engfracmech.2025.111051","DOIUrl":"10.1016/j.engfracmech.2025.111051","url":null,"abstract":"<div><div>During the curing stage, early-age concrete is highly susceptible to multi-field coupling effects, resulting from chemical, thermal, and humidity changes influenced by hydration. These transformations lead to notable non-load-induced deformations, such as expansion and contraction. Under constrained conditions, this process generates substantial tensile stresses, making early-age concrete prone to cracking. The defects in the early stages of vital civil engineering structures and infrastructure pose a potential threat to their integrity, durability, and safety throughout their service life. To accurately predict the early-age crack resistance of early-age concrete, there is an urgent need for research on modeling and analyzing fracture behavior under chemo-thermo-hygro-mechanical fields. Recognizing this need, this paper incorporates the multi-field coupling phenomenon observed in early-age concrete and utilizes phase field theory to propose a fracture model within this theoretical framework. By applying the model to various numerical examples, it reveals the intricate mechanisms behind cracking induced by hydration, temperature, and humidity in early-age concrete. This enables precise simulation and prediction of the entire crack evolution process. Furthermore, our study highlights a dynamic interplay between structural and convective boundary conditions in crack development, demonstrating the model’s potential to predict complex crack patterns. Through this work, we’ve made significant progress in improving the prediction and control of early-age cracks in concrete structures. The insights gained from this research hold tremendous promise for advancing the field and ensuring the durability and integrity of infrastructure.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111051"},"PeriodicalIF":4.7,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706295","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":"Effect of thickness on fatigue crack initiation of nickel-based single crystal superalloy micro notched specimens at 850 °C","authors":"Jundong Wang ,&nbsp;Wenqing Wu ,&nbsp;Xiangqian Xu ,&nbsp;Zhixun Wen ,&nbsp;Zhufeng Yue","doi":"10.1016/j.engfracmech.2025.111054","DOIUrl":"10.1016/j.engfracmech.2025.111054","url":null,"abstract":"<div><div>The effect of thickness on the fatigue performance and crack initiation mechanism of nickel-based single crystal superalloy (Ni-SX) micro-notch specimens were studied. The fatigue lives of specimens under the same nominal stress were obtained by conducting fatigue tests at 850 °C and 950 MPa on bilateral four-notched micro specimens (BFMS) with different thicknesses. The results indicate that the effect of thickness on the fatigue performance of BFMS is not monotonic. Analysis of failure surfaces of BFMS revealed two kinds of crack initiation mechanism: Edge Crack (EC) type initiation mechanism and Subsurface (SC) Crack type initiation mechanism. A damage-coupled macroscopic anisotropic constitutive model was used to conduct a simulation analysis of BFMS with different thicknesses. It was found that EC-type initiation can be characterized by anisotropic equivalent stress, cumulative inelastic strain or damage factor, while SC-type initiation is highly correlated with stress triaxiality. Finally, a machine learning model that considered thickness, stress triaxiality, and crack initiation angle was introduced to predict the fatigue life of BFMS, and the predicted results agree with the experimental results.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111054"},"PeriodicalIF":4.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686827","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":"Multi-field coupling behavior of frozen soil under impact loading based on phase-field model","authors":"Fulai Zhang ,&nbsp;Zhiwu Zhu ,&nbsp;Taiyu Zhang ,&nbsp;Jianguo Ning ,&nbsp;Tao Li ,&nbsp;Zhengqiang Cheng","doi":"10.1016/j.engfracmech.2025.111049","DOIUrl":"10.1016/j.engfracmech.2025.111049","url":null,"abstract":"<div><div>The complex multiphase composition of frozen soil induces significant coupling interactions between the thermal, hydrological, mechanical, and damage fields during deformation, particularly under dynamic loading conditions. This study presents a hybrid decomposition phase-field model to investigate the multi-field coupling behavior and damage mechanisms of frozen soil. Unlike the spectral decomposition model, the proposed framework integrates isotropic degradation and the spectral decomposition methods, thereby enabling the simulation of damage evolution under compressive-dominated loading conditions. The model incorporates the viscous effects and strain rate sensitivity to accurately capture the dynamic response of frozen soil and establishes governing equations for coupled displacement, temperature, and fluid pressure fields. The applicability of the model was validated through confined compression experiments on frozen soil, demonstrating its capability to predict distinctive damage features, such as compaction bands oriented perpendicular to the loading direction, which represent the competitive interaction between the softening mechanism of pore collapse and the hardening mechanism of microstructural densification. This study provides significant advancements in the theoretical understanding and numerical simulation of the dynamic mechanical behavior of frozen soil.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111049"},"PeriodicalIF":4.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686808","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}