Engineering Fracture Mechanics最新文献

{"title":"Effect of welding residual stress on hydrogen-induced fracture and fatigue life of X80 pipeline girth welded joints","authors":"Hai Tang ,&nbsp;Chutian Shen ,&nbsp;Meng Xu ,&nbsp;Wei Zheng ,&nbsp;Chen Sun ,&nbsp;Liangliang Lv ,&nbsp;Haotian Wei ,&nbsp;Liang Wei ,&nbsp;Zhengli Hua","doi":"10.1016/j.engfracmech.2025.111352","DOIUrl":"10.1016/j.engfracmech.2025.111352","url":null,"abstract":"<div><div>In this work, elastic–plastic fracture toughness tests were conducted on X80 base metal (BM), weld metal (WM), and heat affected zone (HAZ) under 12 MPa total pressure with 10 vol% and 30 vol% hydrogen-blended environments. Experimental results revealed that as the hydrogen blending ratio increased from 10 vol% to 30 vol%, the hydrogen-induced fracture toughness <em>K_IH</em> values of the BM, WM, and HAZ decreased by 14.6 %, 17.3 %, and 21.4 %, respectively. Within the investigated parameter range, both WM and HAZ exhibited higher hydrogen-induced crack propagation resistance than the BM under identical environments. Based on experimental results, a finite element framework was established to analyze cross-region fatigue crack growth in welded joints under residual stress. Numerical simulations revealed that in 30 vol% hydrogen environments coupled with welding residual stress, the equivalent stress intensity factor <em>K_eq</em> at the crack tip in the weld zone exceeds the <em>K_IH</em> at 45 % of the wall thickness, posing a fracture risk to the welded joint. Moreover, post-weld heat treatment (PWHT) significantly improves the stress state of welded joints. When the PWHT temperature exceeds 500℃, fatigue cracks maintain stable propagation until reaching 80 % of the wall thickness, with <em>K_eq</em> consistently remaining below <em>K_IH</em> throughout the crack growth process.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111352"},"PeriodicalIF":4.7,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489956","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":"Ultrahigh strain-rate dynamic recrystallization in high manganese austenitic steels: Mechanisms of shear band anisotropy and resistance to localized failure","authors":"Hongyan Guo ,&nbsp;Wentao Wu ,&nbsp;Xin Tan ,&nbsp;Shuyu Nie ,&nbsp;Bin Gan ,&nbsp;Feng Zhao ,&nbsp;Naisheng Jiang ,&nbsp;Min Xia ,&nbsp;Manchao He","doi":"10.1016/j.engfracmech.2025.111360","DOIUrl":"10.1016/j.engfracmech.2025.111360","url":null,"abstract":"<div><div>This study addresses the critical challenge of catastrophic shear failure in deep underground support materials under ultrahigh strain-rate loading (∼10⁴ s⁻¹) characteristic of severe rockburst events. We investigate the compression response and plastic instability mechanisms of a novel high manganese austenitic steel (HMAS) specifically engineered for impact-resistant applications through integrated dynamic experimentation and multiscale characterization. Utilizing a miniature split-Hopkinson pressure bar system, we reveal that HMAS achieves exceptional mechanical performance at 2 × 10⁴ s⁻¹, demonstrating a remarkable compressive strength of 2.5 GPa coupled with 45 % fracture strain, and notable strain rate sensitivity. These outstanding mechanical properties are attributed to multiple deformation mechanisms, including twinning-induced plasticity (TWIP), distorted stacking faults (SFs), nanoscale body-centered cubic (BCC) phase transformations, and the formation of adiabatic shear bands (ASBs) at extreme strain rates. Our analysis reveals that dynamic failure in HMAS primarily occurs along the XY and YZ planes, with cracks propagating along the maximum shear stress direction within ASBs. Microstructural examination via electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) confirms extensive dynamic recrystallization (DRX) within ASBs. This DRX process refines grain structure and mitigates further strain concentration, thereby delaying catastrophic failure despite prior shear localization. Texture analysis reveals that distinct crystallographic orientations between the XY and YZ planes (e.g., dominant Brass/Goss textures in XY vs. Rotated Goss/Y textures in YZ) promote anisotropic ASB formation. These orientation differences alter the Schmid factor distribution for primary slip systems ({111} &lt; 110 &gt; ), favoring shear localization along specific planes. These findings provide a mechanistic understanding of HMAS’s strain rate-dependent strengthening and failure behavior, offering valuable insights into its potential for mitigating rockburst-induced dynamic loads in deep underground engineering applications.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111360"},"PeriodicalIF":4.7,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502288","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":"Fracture behavior of intermetallic clusters in HVDC AlSiMgMn alloys: a finite element study based on actual morphologies","authors":"Xueling Wang ,&nbsp;Haidong Zhao ,&nbsp;Qingyan Xu ,&nbsp;Zhiqiang Han","doi":"10.1016/j.engfracmech.2025.111358","DOIUrl":"10.1016/j.engfracmech.2025.111358","url":null,"abstract":"<div><div>AlSiMgMn alloy die castings are frequently applied due to their excellent surface quality producing efficiency and low producing costs. The brittle Fe-rich intermetallics serve as potential fracture initiation sites during tensile. Their morphology and uneven distribution significantly influence the mechanical properties of die-cast aluminum alloys. Three-dimensional (3D) characteristics of Fe-rich intermetallic and clusters of high vacuum die-cast (HVDC) AlSi10MgMn alloys were obtained by X-ray computed microtomography (μ-CT), and the alloy dynamic fracture was investigated using in-situ microtomography tensile. In this study, the finite element analysis based on the actual intermetallics characteristics was further performed to study the effect of the characteristic including clustering on stress and strain as well as fracture. The results show that individual polyhedral and hexahedral Fe-rich intermetallics tend to debond at high strains, while octagonal dendrite shape intermetallics fracture at low strains. When the volume of intermetallics within the cluster exceeded 20000 μm³, the aggregated intermetallics improved the load-bearing capacity and the force transfer, increasing the yield strength of alloys. However, this would accelerate the intermetallic damage process and result in the hexahedron and polyhedron shape intermetallics to fracture. Moreover, the areas with high-stress triaxiality of the matrix increased, reducing the plastic deformation. After cracks formed from fractured intermetallics, the matrix in the areas with high-stress triaxiality between the cracks occurred quasi-cleavage fracture, accelerating the crack propagation and decreasing the elongation of the alloy.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111358"},"PeriodicalIF":4.7,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335747","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":"Genetic programming-based multi-objective optimization for enhancing fracture performance in nanolayer-reinforced asphalt mixtures to estimate the initial quality and maintenance life","authors":"Lina Lu ,&nbsp;Mohammad Zarei ,&nbsp;Saeid Moghimi","doi":"10.1016/j.engfracmech.2025.111334","DOIUrl":"10.1016/j.engfracmech.2025.111334","url":null,"abstract":"<div><div>In this study, the fracture behavior of hot mix asphalt (HMA) and warm mix asphalt (WMA) reinforced with two nanolayer additives called molybdenum disulfide nanoparticles (MDSN) and reduced graphene oxide nanoparticles (RGON) was investigated in two time periods, the beginning of exploitation and four years after exploitation. In this regard, the effective fracture toughness (K_eff-I/II), fracture energy (FE), fracture flexibility, including flexibility index (FI), toughness index (TI), and cracking resistance index (CRI), fracture stiffness (FS), including tensile stiffness index (TSI) and tensile strength (TS), and damage factor (DF) were examined. Finally, to ensure the accuracy of the results, the Pearson correlation coefficient (PCC) statistical method was employed to analyze the correlation between the fracture indices. Moreover, the genetic programming (GP) model was used to provide a prediction model for obtaining optimum MDSN and RGON contents in CRI and TSI models using multi-objective optimization (MO). The results showed that RGON and MDSN reinforced mixtures showed acceptable performance against tensile-shear deformations under 0 and 1 freeze–thaw cycles (FTC) cycles. Also, 0.6 and then 0.3 % MDSN and RGON had the best performance regarding fracture toughness, energy, flexibility and stiffness, but, MDSN mixtures were better than RGON mixtures. PCC analysis showed a strong correlation between fracture resistance and stiffness, highlighting the interdependence of these properties. GP model results indicated that the relationship between predicted and actual values of CRI and TSI was appropriately described by R values of 99.23 and 98.42 % for CRI model and 98.96 and 98.57 % for TSI model of HMA, and 99.19 and 98.52 % for CRI and 98.95 and 98.96 % for TSI model of WMA mixtures modified with MDSN and RGON, respectively. MO results showed that 0.539 and 0.514 % for HMA and 0.562 and 0.427 % for WMA were the best optimal MDSN and RGON contents to simultaneously maximize CRI and TSI values, respectively. These findings provide valuable insights for policymakers and project managers, highlighting the potential of MDSN and RGON nanomaterials to significantly enhance the durability and cost-effectiveness of both HMA and WMA pavements.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"326 ","pages":"Article 111334"},"PeriodicalIF":4.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517558","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":"Dynamic behaviour and nonlinear ultrasonic characteristic of sandstone under intermittent cyclic impact loading","authors":"X.Y. Wang ,&nbsp;Z.Y. Liu ,&nbsp;Y.F. Wang ,&nbsp;J.L. Liu ,&nbsp;P.F. Li","doi":"10.1016/j.engfracmech.2025.111346","DOIUrl":"10.1016/j.engfracmech.2025.111346","url":null,"abstract":"<div><div>Tunnel excavation constitutes a cyclic construction process characterized by defined time intervals between successive cyclic advancement phases. During drilling-blasting operations in rock tunneling, the surrounding rock is subjected to intermittent cyclic blast-induced impact loads. In this study, a Split Hopkinson Pressure Bar (SHPB) system was employed to conduct the first systematic experimental study on sandstone under intermittent cyclic impacts. The effect of intermittent time on dynamic characteristics, damage and energy evolution of sandstone were investigated. Additionally, the nonlinear ultrasonic characteristics of the sandstone during cyclic impact tests were examined using a nonlinear non-destructive technique. The research results indicate at lower impact pressures, the presence of intermittent time between two adjacent impact cycles can effectively enhance the sandstone’s impact resistance. At 0.35 MPa, during the final impact, the peak stress and dynamic elastic modulus of the specimens under intermittent cyclic loading are 73.13 MPa and 9.58 GPa, respectively, while under continuous cyclic loading, they are 58.83 MPa and 7.83 GPa, respectively. Both intermittent and continuous cyclic impact loading result in axial splitting failure of the sandstone specimens. Under identical impact pressure conditions, the mesoscopic fractal dimension (<em>D</em>_c) of the sandstone fracture surfaces under intermittent cyclic impacts demonstrates significantly lower values compared to continuous cyclic impacts, particularly at 0.35 MPa. As the number of impacts increases, changes in dominant frequency amplitude and nonlinear coefficient remain relatively small, indicating a slower progression of cumulative damage in sandstone specimens during the intermittent cyclic impact process. These findings provide valuable insights into the behavior of sandstone under intermittent loading conditions, which more accurately represent real-world tunneling engineering conditions.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111346"},"PeriodicalIF":4.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335788","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":"Study on fatigue crack growth behavior of titanium alloy with elliptical hole by finite element analysis","authors":"Tao Sun ,&nbsp;Jian Li ,&nbsp;Xun Zhao ,&nbsp;Han Deng ,&nbsp;Jun Xia ,&nbsp;Zhi-Qiang Wang ,&nbsp;Feng-Yi Li","doi":"10.1016/j.engfracmech.2025.111344","DOIUrl":"10.1016/j.engfracmech.2025.111344","url":null,"abstract":"<div><div>In this study, the fatigue crack growth life (<em>N</em>), growth rate (d<em>a</em>/d<em>N</em>) and growth path of the CT specimen made of TC4ELI titanium alloy are investigated under the effect of various geometric parameters of elliptical holes − vertical distance <em>h</em>, horizontal distance <em>d</em>, inclination angle <em>α</em>, axis ratio <em>b</em>:<em>c</em>. The extended finite element method is employed to analyze those crack growth behaviors, while the stress intensity factor amplitude (Δ<em>K</em>) is calculated using the conventional finite element method. The results indicate that the presence of elliptical hole significantly influences fatigue crack growth. When the crack bypasses the elliptical hole, the hole can inhibit crack growth, resulting in reductions in both Δ<em>K</em>_v and Δ<em>K</em>_Ⅰ. Concurrently, the crack path may deflect toward the hole, causing an increase in Δ<em>K</em>_Ⅱ. In the vicinity of the hole, d<em>a</em>/d<em>N</em> decreases, leading to an increase in <em>N</em>. The maximum circumferential stress criterion can be employed to predict the crack deflection angle when the crack is ’attracted’ toward the hole. As the values of <em>h</em>, <em>d</em>, and <em>α</em> increase, the inhibitory effect of the elliptical hole on crack growth diminishes. When <em>h</em> = 0 mm, the hole promotes crack growth. Within a certain range, a decrease in <em>b</em>:<em>c</em> also weakens the inhibitory effect. However, when it is reduced beyond a threshold, a complex interaction arises between the hole’s area and the sharpness of long axis end, making the overall trend ambiguous. Additionally, variations in loading ratio, initial crack length, and specimen geometry can alter the effect of the elliptical hole on fatigue crack growth. Finally, the numerical results for d<em>a</em>/d<em>N</em> and crack growth paths are validated through experimental method.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111344"},"PeriodicalIF":4.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144364507","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 analytical approach for simulating the mechanical behavior of multi-cracked nanobeams","authors":"Daniela Scorza ,&nbsp;Raimondo Luciano ,&nbsp;Andrea Carpinteri ,&nbsp;Sabrina Vantadori","doi":"10.1016/j.engfracmech.2025.111353","DOIUrl":"10.1016/j.engfracmech.2025.111353","url":null,"abstract":"<div><div>This paper presents a novel nonlocal analytical model for simulating the mechanical behaviour of a nanobeam with multiple cracks under bending. The proposed model incorporates the Stress-Driven Nonlocal Model within the framework of the Euler-Bernoulli beam theory, dividing the nanobeam into <em>n + 1</em> beam segments at each of the <em>n</em> crack locations. These segments are connected by massless elastic rotational springs, whose stiffness is determined using both the Griffith’s energy criterion and Linear Elastic Fracture Mechanics. Firstly, the study focuses on asymmetric double cracks, characterised by different lengths and relative distances, for which Stress Intensity Factors are computed using finite element simulations. Then, the proposed model is validated against experimental data from the literature, specifically data on edge-cracked microbeams composed of NiAl single crystals subjected to bending. Finally, a parametric study is conducted varying crack lengths and distances to evaluate their influence on the mechanical response of the microbeam. The main objective of this research work is to provide valuable insights for the design and analysis of nanoscale structures with multiple cracks, contributing to various engineering applications.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"326 ","pages":"Article 111353"},"PeriodicalIF":4.7,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517556","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 consistent fatigue phase-field model for dynamic pulsed fracture propagation in poroelastic media","authors":"Duo Yi ,&nbsp;Liangping Yi ,&nbsp;Zhaozhong Yang ,&nbsp;Jianping Liu ,&nbsp;Liangjie Gou ,&nbsp;Changxin Yang ,&nbsp;Dan Zhang ,&nbsp;Nanxin Zheng","doi":"10.1016/j.engfracmech.2025.111336","DOIUrl":"10.1016/j.engfracmech.2025.111336","url":null,"abstract":"<div><div>This paper presents a thermodynamically consistent dynamic hydraulic-mechanical coupled mixed-mode fatigue phase-field model for simulating fracture propagation in poroelastic rocks under cyclic fluid load. A fatigue degradation function is introduced that significantly reduces fracture toughness as the number of cycles increases and history variables accumulate. Damage is driven by both elastic strain energy density and fluid energy. The model uses the Newmark integration method within a finite element framework and solves the nonlinear system of equations using the Newton-Raphson iterative algorithm. The model is validated through several two-dimensional problems, including a dynamic shear test, a single-edged fracture fatigue test, a Khristianovic-Geertsma-de Klerk model, and a pulse fracturing experiment. The effects of critical energy release rate, injection rate, and injection method on pulse fracture propagation are investigated under single-fracture conditions. Additionally, the effects of different injection rates on fracture propagation are examined for tri-cluster fractures in homogeneous and layered reservoirs. The results demonstrate that the model accurately predicts complex fracture morphology.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111336"},"PeriodicalIF":4.7,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470025","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 new formulation of SBFEM and its application to SIF computation of 3D crack","authors":"Yu Fu ,&nbsp;Xin Xu ,&nbsp;Zhiqiang Hu ,&nbsp;Gao Lin","doi":"10.1016/j.engfracmech.2025.111355","DOIUrl":"10.1016/j.engfracmech.2025.111355","url":null,"abstract":"<div><div>This paper presents a novel scaling line center based scaled boundary finite element method for accurately computing stress intensity factors in three-dimensional fracture problems. Traditional methods, such as the finite element method and the boundary element method, often necessitate mesh refinement near crack fronts, which can result in computational inefficiencies and potential inaccuracies. Although scaled boundary finite element method provides advantages in addressing crack tip singularities, its existing formulations depend on a single scaling center point, which imposes geometric constraints and reduces accuracy in complex crack geometries. The proposed scaling line center based scaled boundary finite element overcomes these limitations by taking the crack front as a scaling line center, characterizing the singularity of stress field and improving accuracy of the computation of the stress intensity factor. The proposed methodology is theoretically formulated within a Hamiltonian framework and rigorously validated through a series of benchmark problems, including: (1) a cantilever beam subjected to concentrated loading, (2) single-edge crack specimens under both uniaxial tension and shear loading conditions, and (3) a lens-shaped crack embedded in a cubic domain under hydrostatic tension. Its ability to efficiently model complex three-dimensional cracks make it a valuable method for structural integrity assessment and failure analysis in fracture mechanics.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111355"},"PeriodicalIF":4.7,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335748","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":"XFEM fracture parameters are not unique for consistent global behavior in tensile, CT, and SENB specimen","authors":"Kishan Dwivedi ,&nbsp;Saher Attia ,&nbsp;Himanshu Pathak ,&nbsp;Samer Adeeb","doi":"10.1016/j.engfracmech.2025.111351","DOIUrl":"10.1016/j.engfracmech.2025.111351","url":null,"abstract":"<div><div>This study investigates multiple sets of fracture parameters that yield the same global behavior for tensile, Compact Tension (CT) and Single Edge Notch Bending (SENB), using a cohesive zone model within the framework of the Extended Finite Element Method (XFEM) in Abaqus software. The cohesive zone model uses fracture energy and maximum principal strain as input parameters to determine damage initiation and crack propagation. By carefully balancing these two fracture parameters across different materials, it is possible to achieve comparable global responses in terms of fracture toughness. Crack Tip Opening Displacement (CTOD) and Crack Mouth Opening Displacement (CMOD) are used to evaluate fracture toughness for tensile, CT, and SENB specimens. Fracture behavior of specimens is presented through Force-CMOD and Force-CTOD curves for various sets of fracture parameters and compared for those sets, showing similar behaviors. The comparison includes an analysis of total crack length, cohesive damage area, and longitudinal strain (LE22) at different locations along the Force-CMOD curves where the CMOD values are identical. Additionally, this study examines the damage initiation location during crack propagation through maximum longitudinal strain perpendicular to the crack surface within region of interest. While the results show that multiple sets of XFEM fracture parameters can produce similar global Force-CMOD/CTOD responses, the local behavior around the crack tip differs significantly. For instance, the crack length varied by 10.46 % (tensile), 6.89 % (CT), and 4.96 % (SENB), and the maximum longitudinal strain near the crack surface changed by 20.80 %, 27.53 %, and 39.69 %, respectively. These findings reveal that global behavior alone is insufficient for selecting accurate XFEM fracture parameters and emphasize the need to also consider local behavior near the crack tip.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111351"},"PeriodicalIF":4.7,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307871","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}