Theoretical and Applied Fracture Mechanics最新文献

{"title":"Elasto-viscoplastic fast Fourier transform modeling framework for assessing microstructural effects on stress intensity factors characterizing fracture toughness","authors":"Milica Letic ,&nbsp;Benjamin S. Anglin ,&nbsp;Miroslav Zecevic ,&nbsp;Ricardo A. Lebensohn ,&nbsp;Marko Knezevic","doi":"10.1016/j.tafmec.2025.105022","DOIUrl":"10.1016/j.tafmec.2025.105022","url":null,"abstract":"<div><div>A large-strain elasto-viscoplastic fast Fourier transform (LS-EVPFFT) model with non-periodic (NP) velocity-based boundary conditions is adapted to simulate the sensitivity of stress intensity factors on microstructure for 304L stainless steel. The material was characterized via electron backscattered diffraction (EBSD) serial-sectioning to obtain a measured 3-D microstructural cell to perform simulations. The NP-LS-EVPFFT model, including the simulation setup and boundary conditions, was verified using a crystal plasticity finite element (CPFE) model. To this end, the generation of meshes of notched specimens was developed, which involved creating Python scripts for mesh “cutting” in Abaqus, and Sculpt scripts in Cubit for meshing of the measured microstructural cell processed with DREAM.3D. The complexity of the mesh preparation highlighted the advantages of the FFT-based model, which circumvents the mesh generation process. Given the efficiency of the FFT-based model, statistical distribution of stress intensity factors in function of crystal orientation at the crack tip, grain structure, and crystallographic texture surrounding the crack tip were predicted. The distributions reveal about 10 % variation of stress intensity factors with microstructure with the most significant sensitivity found to be the crystal orientation at the crack tip. The methodology developed in this work is discussed as a practical simulation tool for predicting the sensitivity of stress intensity factors on microstructural variability in metallic materials.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105022"},"PeriodicalIF":5.0,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184492","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":"Experimental study on blasthole fracturing caused by stress waves from a cylindrical charge","authors":"Meng Ren ,&nbsp;Zhongwen Yue ,&nbsp;Jun Zhou ,&nbsp;Xu Wang ,&nbsp;Kejun Xue ,&nbsp;Peng Wang ,&nbsp;Shengnan Xu","doi":"10.1016/j.tafmec.2025.105020","DOIUrl":"10.1016/j.tafmec.2025.105020","url":null,"abstract":"<div><div>During the detonation of a cylindrical charge, the advancing detonation wave continuously alters the stress wave field. This causes dynamic changes in the surrounding stress and strain distributions. These evolving fields lead to distinct fracturing patterns around the blasthole, which are still not fully understood. To investigate this process, dynamic photoelasticity and Digital Image Correlation experiments were performed. Post-blast observations revealed numerous dense cracks along the blasthole wall. The cracks were shortest near the initiation point and became progressively longer toward the tail end of the explosive column. This pattern is linked to the evolution of stress waves during detonation. As the detonation wave advanced, new stress waves were continuously generated and superimposed on earlier ones. This led to increasing stress intensity near the detonation front. In the experiment, the detonation velocity was lower than the P-wave velocity but higher than the S-wave velocity. The P-waves propagated ahead of the detonation front and formed a fan-shaped superposition zone. The S-waves lagged behind and formed a conical zone. Photoelastic results showed that fringe order and principal stress difference increased along the detonation direction. DIC measurements confirmed that the strain also increased in this direction. The rise in stress and strain explains the progressive increase in crack length along the blasthole wall.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105020"},"PeriodicalIF":5.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167892","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 properties prediction of Ultra-High-Performance Concrete (UHPC) after High-Temperature exposure based on Meso-Scale finite element analysis and artificial neural network","authors":"Huayi Wang ,&nbsp;Jia He ,&nbsp;Ming Zhou ,&nbsp;Bingyan Wei ,&nbsp;Chao Wu ,&nbsp;Zhiyi Tang ,&nbsp;Sitian Zhang","doi":"10.1016/j.tafmec.2025.105018","DOIUrl":"10.1016/j.tafmec.2025.105018","url":null,"abstract":"<div><div>High temperature can severely weaken the mechanical properties of UHPC. As the core index for evaluating the material’s ability to resist crack propagation, the fracture property should be given more attention. Using the combination of experiments, finite-element models, and artificial neural network models is of theoretical and practical significance for understanding and predicting the fracture properties of UHPC after high-temperature exposure. In this study, two types of UHPC were first prepared. Their fracture properties were investigated after being heated from normal temperature (25 °C) to 200 °C, 400 °C and 600 °C respectively, and then naturally cooled to normal temperature. Subsequently, the matrix’s cracking phenomenon was simulated using the Cohesive Zone Model (CZM). For steel fibers, an equivalent failure model was adopted to consider the non-linear deformation relationship between the fibers and the matrix, and then a fracture model of UHPC was established after high-temperature exposure. From a quantitative perspective, the influence of the mechanical properties of the matrix and fibers after high-temperature exposure on the macroscopic fracture properties of UHPC was analyzed. Eventually, based on the experimental and finite-element simulation data, an artificial neural network model capable of predicting the fracture properties of UHPC after high-temperature exposure was constructed. The research conclusions are as follows: High-temperature exposure does not change the fracture morphology of UHPC specimens. For UHPC-containing SF fibers, the loss of strength after high-temperature exposure is slower than that of UHPC without steel fibers. High-temperature exposure remodels the original characteristics of the curve. For UHPC-containing SF fibers, the loss of fracture toughness after high-temperature exposure is slower than that of UHPC without steel fibers. SF fibers can effectively delay the crack propagation in UHPC before the peak load after high-temperature exposure. The calculation results of the UHPC fracture model after high-temperature exposure, which is established based on the CZM and equivalently considers the bond-slip between steel fibers and the matrix, are consistent with the experimental results and can accurately describe the mechanism of the change in UHPC fracture characteristics after high − temperature exposure. The explicit solution proposed based on the artificial neural network model has high accuracy in predicting the fracture properties of UHPC after high-temperature exposure. It can be an important tool for calculating fracture properties in multivariable high-temperature experiments.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105018"},"PeriodicalIF":5.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177836","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":"Polynomial chaos expansion-based stochastic phase field model for hydrogen-assisted cracking","authors":"Zhenghe Liu ,&nbsp;Shushen Xu ,&nbsp;Yujing Ma ,&nbsp;Haojie Lian ,&nbsp;Yilin Qu ,&nbsp;Leilei Chen","doi":"10.1016/j.tafmec.2025.105000","DOIUrl":"10.1016/j.tafmec.2025.105000","url":null,"abstract":"<div><div>Hydrogen-assisted cracking presents a significant threat to high-performance metallic materials commonly used in engineering applications. This paper presents a surrogate model based on polynomial chaos expansion method, integrated with a phase field fracture model, to simulate hydrogen-assisted cracking. The proposed approach aims to efficiently and accurately predict the behavior of hydrogen-assisted cracking in materials by integrating material degradation due to hydrogen with the phase field fracture model, while accounting for material property and multi-crack characteristics variability. The surrogate model is constructed using stochastic input variables, such as effective Young’s modulus, fracture toughness and multi-crack characteristic control coefficient, thereby reducing the computational cost associated with numerical simulations. To validate the model, several 2D numerical case studies were conducted, demonstrating its ability to capture the initiation, propagation, and final fracture characteristics of hydrogen-assisted cracks. The results indicate that the proposed model can effectively predict the occurrence and progression of hydrogen-assisted cracking, providing a reliable tool for assessing the fracture behavior of high-performance metallic materials under hydrogen embrittlement. Furthermore, this method has broad applicability and can inform material selection and fracture prediction research in other fields.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105000"},"PeriodicalIF":5.0,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135005","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":"Cracking mechanisms of fissure-hole specimens under compression-shear conditions: insights from sand 3D printing technology and DEM simulations","authors":"Zhenyu Zhu ,&nbsp;Mengyao Jiang ,&nbsp;Shuyang Yu ,&nbsp;Yifei Li","doi":"10.1016/j.tafmec.2025.105017","DOIUrl":"10.1016/j.tafmec.2025.105017","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The fissure-hole composite structure significantly influences the mechanical properties and failure modes of rock masses. In order to figure out the interaction mechanisms between holes and fissures under compression-shear loading, such as the crack initiation mechanisms induced by stress concentration and influences of different fissure patterns on the interaction intensity, sand 3D printing (3DP) technology is employed to fabricate rock-like specimens containing various fissure-hole configurations. Compression-shear experiments, digital image correlation (DIC) full-field strain analysis, and discrete element method (DEM) numerical simulations are integrated to investigate the failure patterns. The cracks generated in the specimens are classified into five types: tensile mode crack (TC), shear mode crack (SC), tensile-dominated mode crack (TDC), shear-dominated mode crack (SDC), and mixed mode crack (MC). Among these, SC and SDC are primarily distributed between the hole and the fissures, TDC and TC mainly occur between the fissures and the specimen boundary, while MC appears in both regions. As the fissure vertical distance &lt;em&gt;L&lt;sub&gt;V&lt;/sub&gt;&lt;/em&gt; and fissure horizontal distance &lt;em&gt;L&lt;sub&gt;H&lt;/sub&gt;&lt;/em&gt; increase, the specimens tend to exhibit shear-dominated mixed failure; conversely, as the fissure dip angle &lt;em&gt;α&lt;/em&gt; increases, the specimens tend to exhibit tensile-dominated mixed failure. The load–displacement curves of the specimens comprise four stages: the compaction stage, the elastic deformation stage, the stable crack propagation stage, and the unstable crack propagation stage. The peak strength first decreases and then increases as &lt;em&gt;L&lt;sub&gt;V&lt;/sub&gt;&lt;/em&gt; increases, while it increases monotonically as &lt;em&gt;α&lt;/em&gt; increases, and first increases then decreases as &lt;em&gt;L&lt;sub&gt;H&lt;/sub&gt;&lt;/em&gt; increases. The evolution law of energy dissipation in the simulation is also monitored in this paper. After reaching the peak load, the boundary energy is rapidly transformed into dissipative energy, and the strength change trend is positively correlated with the size of boundary energy, but negatively correlated with the conversion rate of dissipative energy. Finally, the crack initiation mechanisms under different fissure configurations are discussed. All specimens developed stress concentration zones connecting the specimen boundary, fissures, and holes, guiding crack coalescence and altering the interactions between the holes and fissures. Increasing &lt;em&gt;L&lt;sub&gt;V&lt;/sub&gt;&lt;/em&gt;, &lt;em&gt;α&lt;/em&gt;, and &lt;em&gt;L&lt;sub&gt;H&lt;/sub&gt;&lt;/em&gt; ultimately weakens the fissure-hole interactions via changing the stress concentration between holes and fissures, the guided failure between them is weakened and the stabilities of specimens are improved. The research results elucidate the interaction mechanisms of fissure-hole composite structures under compression-shear loading and can provide new insights for optimizing engineering design and preventing rock engineering disasters.&lt;/d","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105017"},"PeriodicalIF":5.0,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134998","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 mechanical behaviour and energy variation of SCC samples with different crack spacings under dynamic loading","authors":"Ri-hong Cao ,&nbsp;Hailong Yu ,&nbsp;Chaoyi Yang ,&nbsp;Xianyang Qiu ,&nbsp;Hang Lin ,&nbsp;Zhigang Tian","doi":"10.1016/j.tafmec.2025.105016","DOIUrl":"10.1016/j.tafmec.2025.105016","url":null,"abstract":"<div><div>In this experimental investigation, SHPB impact tests were conducted on short core-in-compression (SCC) samples with varying crack spacings to investigate the relationships between peak fracture load and rock mode II fracture toughness at different crack spacings, as well as the evolution of failure morphology. Additionally, discrete element simulations using PFC3D were performed to investigate the fracture progression, crack development, and energy variations from a microscale perspective. Experimental observations demonstrate enhanced mode II dynamic fracture toughness corresponding to larger crack spacing configurations, and intercrack distance variations exert a dominant control on the fracture propagation patterns observed in the tested samples. Furthermore, with increasing fracture spacing, quantitative analysis reveals a gradual reduction in shear crack prevalence within samples, paralleled by a commensurate increase in tensile crack formation rates. The energy consumed by a sample during crack propagation progressively increases as the crack spacing increases, a trend that is influenced by both the crack length and the number of microcracks. The failure modes of the samples with C/H values of 0.4 and 0.5 change, suggesting the existence of a critical C/H value between 0.3 and 0.4, which causes the SCC samples to transition from mode II fracture behaviour.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105016"},"PeriodicalIF":5.0,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154775","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":"Propagation and fracture mechanism of an internal crack in brittle solid based on 3D-ILC under uniaxial tension","authors":"Yunfei Wang ,&nbsp;Haijun Wang ,&nbsp;Zhende Zhu ,&nbsp;Jihong Yu","doi":"10.1016/j.tafmec.2025.105019","DOIUrl":"10.1016/j.tafmec.2025.105019","url":null,"abstract":"<div><div>Owing to the low tensile strength of rocks, internal crack expansion under tensile loading is highly susceptible to causing rock engineering failure without warning. In order to reveal the propagation and fracture mechanism of 3D internal cracks under tensile loading, uniaxial tensile tests. numerical simulations were carried out in this study using the 3D-ILC (3D-internal laser-engraved crack) method for prefabricated 3D internal cracks inside transparent rock-like materials. The results indicate that: under axial tension, the crack propagation surface is “S” shaped from the inside to the outside through the outer surface of the specimen, near the left and right side boundaries of the crack surface in the principal max tensile stress is approximately horizontal; According to the distribution and direction of the Wallner lines of the fracture surface, it is known that the prefabricated crack firstly propagates in the ring under the action of uniaxial tension and then changes into a wave shape to propagate to the transverse boundaries on both sides; The trend of crack propagation under uniaxial tension at different inclination angles was basically the same, and the relationship between <em>K</em>_II/<em>K</em>_I and crack deflection angle is revealed by mutual verification of the theoretical formula of energy release rate and numerical simulation results, i.e., the pre-crack inclination angle increases, <em>K</em>_II/<em>K</em>_I increases subsequently, and the crack deflection angle also increases. The research findings will serve as experimental and numerical references for studies on the propagation and fracture mechanism of internal cracks under tensile loading conditions across a spectrum of brittle materials, including rocks.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105019"},"PeriodicalIF":5.0,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177838","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 and energy evolution characteristics of pre-cracked sandstone under multi-stage amplitude-increasing cyclic loading","authors":"Jun Xu,&nbsp;Shihe Sun,&nbsp;Sen Luo","doi":"10.1016/j.tafmec.2025.105011","DOIUrl":"10.1016/j.tafmec.2025.105011","url":null,"abstract":"<div><div>To systematically investigate the damage evolution and energy dissipation mechanisms associated with rock fracture induced by cyclic disturbance, a series of multi-stage amplitude-increasing cyclic loading tests are conducted on red sandstone specimens containing elliptical pre-existing flaws. The results indicate that, under low-cycle fatigue loading, the peak stress of red sandstone specimens shows a V-shaped variation with increasing defect inclination, with a minimum-to-maximum difference of 26.3 %. In contrast, the peak stress exhibits a W-shaped variation with increasing defect size, with a difference of 18.9 %. Under low-cycle fatigue loading, the elastic modulus exhibits significant hardening and can be modeled accurately with a quadratic function. Furthermore, the evolution of damage with respect to the fatigue life ratio (<em>N</em>/<em>N</em>_f, where <em>N</em> represents the current cycle count and <em>N</em>_f denotes the total number of cycles) can be categorized into three stages: an initial rapid increase stage (0 ≤ <em>N</em>/<em>N</em>_f &lt; 0.2), a middle steady increase stage (0.2 ≤ <em>N</em>/<em>N</em>_f ≤ 0.8), and a late rapid increase stage (0.8 &lt; <em>N</em>/<em>N</em>_f ≤ 1). Additionally, a one-dimensional constitutive equation describing the fatigue damage evolution of red sandstone is established. Energy calculation results demonstrate that both dissipated energy and elastic strain energy exhibit a trend of slow growth followed by sharp increases during the progression of fatigue life ratio. This change can be quantitatively characterized using an exponential function model. The ratio <em>K</em>, defined as the dissipated energy (density) to elastic strain energy (density), remains consistently below 0.7 throughout the evolution of low-cycle fatigue damage. It exhibits three distinct stages of variation as the fatigue life ratio increases. These research findings not only enhance the understanding of rock mass failure mechanisms induced by cyclic disturbances but also provide critical experimental evidence and theoretical support for the design, construction, and long-term stability assessment of deep rock mass engineering.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105011"},"PeriodicalIF":5.0,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168303","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":"Evaluating fracture toughness distributions of laser cladding repaired hydrogenation reactors by spherical indentation tests (SITs)","authors":"Tairui Zhang ,&nbsp;Rutai Yue ,&nbsp;Xin Ma ,&nbsp;Zhiqiang Ge ,&nbsp;Alexander Kren ,&nbsp;Xiaochao Liu","doi":"10.1016/j.tafmec.2025.105013","DOIUrl":"10.1016/j.tafmec.2025.105013","url":null,"abstract":"<div><div>Laser cladding repairing provides reliable technical support for the remanufacturing of hydrogenation reactors. However, its repair quality can be significantly affected by process parameters, material aging, and a variety of other factors, urgently demanding an in-situ evaluation method to ensure service reliability of remanufactured hydrogenation reactors. In this case, this study provides an extensive experimental investigation on the fracture toughness predictions by spherical indentation tests (SITs). Firstly, SIT-based fracture toughness predictions are conducted on repaired specimens under optimal process parameters, which indicates significant ductile-to-brittle transitions can be observed in different regions of repaired specimens, together with obvious initial damage existing in both the cladding zone and interface. These factors significantly impact the prediction accuracy of <em>meso</em>-damage mechanics-based models, while the critical stress-critical strain criterion demonstrates superior capability in predicting ductile-to-brittle transitions across different zones. Subsequently, the critical stress-critical strain criterion is employed to investigate the fracture toughness distributions under different process parameters and aging status. It is found that compared to conventional large-scale sampling, the localized characteristics enable SITs providing more precise acquisition of fracture toughness distribution, thus facilitates identification and evaluation of the weakest part of repaired specimens.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105013"},"PeriodicalIF":5.0,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135004","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 mixed mode I/II fracture test specimen considering the influence of cracks and holes","authors":"Yu Zhao ,&nbsp;Qian Cao ,&nbsp;Shuang Dang ,&nbsp;Chaolin Wang ,&nbsp;Kun Zheng ,&nbsp;Zhongqian Chen ,&nbsp;Wei Tang","doi":"10.1016/j.tafmec.2025.105014","DOIUrl":"10.1016/j.tafmec.2025.105014","url":null,"abstract":"<div><div>This study presents a novel testing specimen for mixed-mode I/II fracture characterization in cracked-perforated materials commonly found in pipelines and tunnels. The improved semi-circular bend (ISCB) specimen incorporates a semi-ring geometry with a centrally located hole and prefabricated radial crack, enabling accurate simulation of crack-hole interactions under structural loading conditions. Through finite element analysis, we systematically quantified critical fracture parameters including mode I/II stress intensity factors and T-stress. Experimentally, three-point bending tests on PMMA ISCB specimens using a universal testing machine quantified crack initiation angles and fracture toughness values. Comparative analyses of classical fracture criteria revealed the generalized maximum tangential stress (GMTS) criterion’s superior predictive capability. The GMTS criterion achieved the most accurate fracture angle predictions with &lt;5 % deviation in average fracture toughness estimates.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 105014"},"PeriodicalIF":5.0,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168795","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}