Theoretical and Applied Fracture Mechanics最新文献

{"title":"Fracture prediction in recycled aggregate concrete using experience-based machine learning with a defective database","authors":"Xiangyu Han ,&nbsp;Qilong Zhao ,&nbsp;Xinru He ,&nbsp;Bin Jia ,&nbsp;Yihuan Xiao ,&nbsp;Ruizhe Si ,&nbsp;Qionglin Li ,&nbsp;Xiaozhi Hu","doi":"10.1016/j.tafmec.2025.104975","DOIUrl":"10.1016/j.tafmec.2025.104975","url":null,"abstract":"<div><div>The fracture behavior of recycled aggregate concrete (RAC) is highly complex, leading to significant variability in test results and a lack of reliable data, making direct fracture prediction challenging. This study addresses the key scientific problem of how to improve fracture prediction accuracy when working with defective experimental datasets. First, based on experimental analysis and fracture mechanics models, a two-step data processing approach is developed to clean and augment the defective dataset, improving its reliability, richness, and dimensionality. Then, an ensembled learning algorithm is employed to construct a robust predictive model with strong generalization capability (R² = 0.942). Finally, this study establishes an experience-based artificial intelligence framework for utilizing defective datasets in fracture prediction, providing a novel and practical solution to a long-standing challenge in RAC application.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 104975"},"PeriodicalIF":5.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911825","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 the I-II mixed mode fatigue crack growth behavior of TC4 titanium alloy","authors":"Miao Xinting ,&nbsp;Liu Guoxu ,&nbsp;Peng Jian ,&nbsp;Tao Ping ,&nbsp;Zhang Jinbo ,&nbsp;Li Jian","doi":"10.1016/j.tafmec.2025.104985","DOIUrl":"10.1016/j.tafmec.2025.104985","url":null,"abstract":"<div><div>This article focuses on investigating the influence of mixed mode loading and loading ratio on the fatigue crack growth (FCG) behaviors of TC4 titanium alloy. It reveals that there exists a transformation towards mode I dominant crack for mixed mode crack, while the existing mode II component at crack tip still has effects on FCG behavior, which causes a continuous change in the crack propagation path and a slower fatigue crack growth rate. During the crack propagation, the non-collinear loading has an important role on the stress intensity factor, which causes greater mode I and mode II stress intensity factors. The improved expressions of SIFs have been proposed taken the non-collinear loading into account. The effects of mixed mode loading and loading ratio on the crack tip fields were also discussed, where the SIF acting as the driving force was modified to be applicable to all the loading ratios. The FCGR curve with relationship of the equivalent SIF was proposed taking the compressive loading and mixed mode loading into consideration.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104985"},"PeriodicalIF":5.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895105","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 crack extension and acoustic emission response law of 316L austenitic stainless steel by hydrogen charging","authors":"Shengquan He ,&nbsp;Yanran Ma ,&nbsp;Dan Zhao ,&nbsp;Dazhao Song ,&nbsp;Xueqiu He ,&nbsp;Siyu Luo ,&nbsp;Jia Wang","doi":"10.1016/j.tafmec.2025.104983","DOIUrl":"10.1016/j.tafmec.2025.104983","url":null,"abstract":"<div><div>To better understand the crack propagation behavior of 316L austenitic stainless steel in hydrogen environments, fatigue tests were conducted at three different stress levels on both untreated and electrochemically hydrogen-charged samples. Acoustic emission (AE) monitoring was performed throughout the testing process. The results indicate that both the hydrogen environment and stress are primary factors in reducing the fatigue life of 316L austenitic stainless steel, with a synergistic interaction that accelerates material failure. Hydrogen charging alters the fatigue fracture mechanism of 316L stainless steel, increasing the randomness of the crack extension path due to the increasing number of secondary cracks in hydrogen-charged samples. During fatigue fracture, the energy release rate of acoustic emission signals exhibits a linear positive correlation with the fatigue crack propagation rate. Under lower stress conditions, hydrogen-charged samples exhibit a higher fatigue crack propagation rate, with hydrogen serving as the primary influencing factor. A quantitative characterization model for acoustic emission parameters, suitable for hydrogen embrittlement environment but not affected by fatigue average stress, was developed to compute the fatigue crack propagation rate. This study reveals the fatigue crack propagation behavior and damage mechanisms of hydrogen-charged 316L austenitic stainless steel.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104983"},"PeriodicalIF":5.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903898","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":"Dual-horizon peridynamics-based variational damage modeling for complex dynamic fractures","authors":"Huilong Ren ,&nbsp;Xiaoying Zhuang ,&nbsp;Yehui Bie ,&nbsp;Timon Rabczuk ,&nbsp;Hehua Zhu","doi":"10.1016/j.tafmec.2025.104974","DOIUrl":"10.1016/j.tafmec.2025.104974","url":null,"abstract":"<div><div>Fracture simulation by cutting bonds in non-ordinary state-based peridynamics may suffer from numerical instability. To solve this problem, we develop a dual-horizon peridynamics equipped with variational damage for the dynamic brittle fracture modeling in elastic solid. Without using damage variables explicitly, the damage field is a natural outcome or a post-processing of the strain energy field. Since the bond-cutting process is removed, the numerical stability of fracture propagation is greatly enhanced. Unlike peridynamics, which tracks the damage state of each bond throughout the simulation, the variational damage model employs a scalar damage variable to represent the state of each material point. This model expresses damage as a function of the “positive” strain energy density, utilizing the spectral decomposition of the strain tensor. Such a decomposition scheme effectively prevents crack surface interpenetration when the crack closes, ensuring physically consistent fracture behavior. A flowchart outlining the numerical implementation of this approach is presented. We demonstrate the capabilities of the current method by simulating a notched plate subjected to tensile/shear boundary conditions, the Kalthoff &amp; Winkler experiment and fragmentation simulation in two and three dimensions.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104974"},"PeriodicalIF":5.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895106","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 indentation defects on fatigue crack propagation behavior of weld and base material: An in-situ fatigue study","authors":"Shaohu Liu ,&nbsp;Yang Yang ,&nbsp;Lei Lei ,&nbsp;Zhiying Liu ,&nbsp;Wenchuang Wu","doi":"10.1016/j.tafmec.2025.104982","DOIUrl":"10.1016/j.tafmec.2025.104982","url":null,"abstract":"<div><div>Surface indentation defects generated during coiled tubing (CT) transportation and operation critically influence fatigue failure mechanisms, yet their microstructural interaction dynamics remain poorly characterized. Through in-situ fatigue testing coupled with electron backscattering diffraction (EBSD) characterization, this work systematically examines how indentation-induced microstructural modifications govern crack propagation behaviors in base metal (BM) and weld zone (WZ) materials. The results show that indentation generates fundamentally distinct microstructural responses in BM and WZ, subsequently dictating their crack progression mechanisms. In the plastic influence zone of the indentation, the interlocking basket weave structure formed by irregular grains nested in each other during the pressing process of BM indentation was damaged, resulting in a large amount of stress concentration at the grain boundary, accelerating the main crack propagation. Conversely, WZ develops enhanced resistance to crack formation and propagation effectively due to indentation-induced homogenization of dislocation density and a certain increase in grain and grain boundary strength. In the non-affected zone of indentation, the microstructures of both the BM and the WZ restored their original properties. In the BM, ferrite with varying sizes and shapes, along with a small amount of pearlite, were intricately nested and interwoven. This structure exhibited superior coordination deformation capability, effectively delaying crack propagation. In contrast, within the WZ, ferrite grains were larger and more independent, leading to diminished intergranular deformation compatibility. This structural characteristic facilitated localized strain concentration through intensive slip band formation, which subsequently accelerated the propagation of main cracks.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104982"},"PeriodicalIF":5.0,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143900080","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":"Numerical and photoelastic investigation of the effect of material cracks on interfacial cracks","authors":"K. Shins,&nbsp;K. Ramesh","doi":"10.1016/j.tafmec.2025.104980","DOIUrl":"10.1016/j.tafmec.2025.104980","url":null,"abstract":"<div><div>This study presents the numerical analysis of the interaction of a material crack with an interfacial crack in a bimaterial system focussing on a rock-concrete bimaterial. The numerical model is validated using photoelasticity by comparing the numerically plotted isochromatic fringes with the experimental ones. Epoxy-polycarbonate bimaterial pair with an interfacial crack subjected to compression is used for the experiments and numerical analysis. This material pair is chosen as it has the similar bimaterial ratio as that of a rock-concrete bimaterial pair. The validated numerical model is then used in conjunction with a recently developed approach for fracture parameter evaluation using isochromatics plots to study the Stress Intensity Factor (SIF) variations with respect to different inclination angles and to study the interaction of interfacial crack with another material crack present in one of the materials. The results indicate that the inclination of the interface has an effect on the mode of failure. It is found that the interaction of the material crack increases the SIFs for the interface crack for all the different configurations of the material crack. The variation of SIFs with respect to the orientation of the material crack and the distance between the interface and the material crack are also studied.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104980"},"PeriodicalIF":5.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895104","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":"Enhancing the fracture toughness of eco-friendly self-compacting concrete with waste glass coarse aggregates and steel fibers: A mixed-mode I/II fracture analysis using SCB specimens","authors":"Morteza Ghodratnama ,&nbsp;Arash Rajaee ,&nbsp;Amir R. Masoodi ,&nbsp;Saeed Abrishami ,&nbsp;Amirhossein Davarpanah T.Q. ,&nbsp;Pooyan Pournoori","doi":"10.1016/j.tafmec.2025.104969","DOIUrl":"10.1016/j.tafmec.2025.104969","url":null,"abstract":"<div><div>Self-compacting concrete (SCC) has become increasingly significant in contemporary construction due to its excellent rheological characteristics and improved constructability. Nevertheless, its quasi-brittle nature and limited fracture toughness present notable challenges. This research explores the combined effects of utilizing waste glass coarse aggregates (WGCA) and hooked-end steel fibers (SFs) on the fracture behavior and mechanical properties of SCC subjected to complex loading scenarios. WGCA was incorporated to replace natural coarse aggregates (NCA) at replacement levels of 15 %, 30 %, and 45 %, while SFs were introduced at volume fractions of 0.1 %, 0.3 %, and 0.5 %. A total of 240 semi-circular bending (SCB) specimens were evaluated under four distinct loading modes (I, I/II, II/I, and II) after curing for 28 and 56 days, in addition to 60 cubic samples for assessing compressive strength. The findings indicate that substituting NCA with WGCA up to 30 % improves both fracture toughness and compressive strength, attributed to enhanced matrix densification resulting from the pozzolanic activity of glass particles. However, exceeding this percentage leads to a decline in performance due to inadequate bonding at the interface between the aggregate and matrix. The inclusion of SFs effectively addresses this limitation by improving crack-bridging mechanisms, stiffness, and ductility. The most favorable outcomes were observed with 30 % WGCA and 0.5 % SF, which provided exceptional resistance to crack propagation across all loading modes. This extensive study offers valuable insights into the sustainable use of WGCA and SFs in SCC, tackling both environmental and structural issues. The results highlight the potential benefits of integrating recycled materials and fiber reinforcement to enhance the performance of SCC under practical loading conditions.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104969"},"PeriodicalIF":5.0,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873190","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":"Defect features critical to the fatigue of additively manufactured Ti-6Al-4V","authors":"Muztahid Muhammad ,&nbsp;Mohammad Salman Yasin ,&nbsp;Sajith Soman ,&nbsp;Shuai Shao ,&nbsp;Nima Shamsaei","doi":"10.1016/j.tafmec.2025.104981","DOIUrl":"10.1016/j.tafmec.2025.104981","url":null,"abstract":"<div><div>This study aimed to identify the morphological features of process-induced volumetric defects most influential on the fatigue behavior of laser powder bed fused Ti-6Al-4V. Fatigue test specimens were machined from round bars fabricated using eight distinct process parameter sets and three build orientations to ensure a wide range of defect morphologies and populations. Uniaxial, constant amplitude, fully-reversed fatigue tests were conducted on these specimens until failure. Fractography was performed to identify the defect responsible for the fatigue crack initiation and extract its morphological features. The influence of these features on fatigue behavior was examined by analyzing experimental data and finite element analysis results. While size was the most critical defect feature influencing fatigue behavior, it could not fully explain the variation in fatigue life by itself. For defects of similar size located at the same location, circular defects appeared to be more detrimental than irregularly shaped ones. A new defect size parameter, the square root area of the maximum inscribed circle, was introduced to partially account for both the size and shape of the volumetric defects, which exhibited a strong correlation with life compared to existing parameters.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104981"},"PeriodicalIF":5.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878658","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":"Gpgpu-parallelized FDEM modelling of mode-I fracturing during the NSCB test under quasi-static and dynamic loading conditions","authors":"Huaming An ,&nbsp;Xin Zhang ,&nbsp;Hongyuan Liu ,&nbsp;Daisuke Fukuda ,&nbsp;Haoyu Han ,&nbsp;Shunchuan Wu","doi":"10.1016/j.tafmec.2025.104979","DOIUrl":"10.1016/j.tafmec.2025.104979","url":null,"abstract":"<div><div>The hybrid finite-discrete element method (FDEM) demonstrates significant advantages in simulating the fracture and fragmentation of brittle materials. However, the traditional FDEM is computationally demanding and struggles to handle large-scale problems with numerous nodes, elements, and contact interactions. To enhance computational efficiency and scalability, the authors’ previously developed sequential hybrid FDEM open-source code has recently implemented its 2D/3D parallelization, using compute unified device architecture (CUDA) C/C++ based on the general-purpose graphic processing unit (GPGPU). The optimized code runs 128 times faster than its previous version. In this work, the GPGPU-parallelized hybrid FDEM is employed to simulate the notched semi-circular bend (NSCB) tests under quasi-static and dynamic loading. The simulation results accurately capture the deformation trends, fracture patterns, and post-failure characteristics observed in laboratory experiments. The influence of loading rate on rock fracture behavior, force–displacement curve, and fracture toughness was discussed. It is revealed that the essential difference between static and dynamic behavior lies in the interaction of dynamic effects with the material’s structural effects during dynamic loading. Specifically, with increasing loading rate, the notch effect in the NSCB specimen diminishes until complete elimination, and the failure mode transitions from a single splitting failure to a mixed shear-tension failure. Furthermore, a critical loading rate threshold is identified, after which the fracture toughness of the specimen increases linearly while remaining essentially constant before reaching it. This study demonstrates that the GPGPU-parallelized hybrid FDEM is a robust and effective numerical tool for investigating the continuous-discontinuous deformation of brittle materials in rock engineering applications.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104979"},"PeriodicalIF":5.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878580","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":"Single-point measuring method for J-integral based on the integrating isopleth","authors":"Enqi Zhang ,&nbsp;Bin Cheng ,&nbsp;Sheng Xiang ,&nbsp;Derui Li","doi":"10.1016/j.tafmec.2025.104977","DOIUrl":"10.1016/j.tafmec.2025.104977","url":null,"abstract":"<div><div>Stem from the path-independence of the <em>J</em>-integral, the computational notion of integrating isopleth is conceived, along which the integral term preserves constant, and the correlated parameters are abstracted to describe the characteristic of the isopleth. Considering the finite plate with a central crack subject to uniform tensile stress, the expression for the token parameter of the <em>J</em>-integral isopleth is deduced based on the general form of the crack field. Accordingly, a single-point method is first proposed exploiting the characteristics of the isopleth. Through the isopleth exploration algorithm and the numerical results, the relations between token parameters and the proposed method are scrupulously verified. Concerning the applicability of the proposed method, numerical tests are performed towards the central cracked thin plate under various loading conditions, while the <em>J</em>-integrals calculated by the single-point method yield high consistency with the real value. Moreover, the optimal locations of the computation point are derived from the relative error distribution, at which guarantees a computational precision within ± 2 %. Overall, the <em>J</em>-integral of the cracked finite plate under symmetric loading can be swiftly acquired utilizing the single-point method, free of the complicated contour integrating.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104977"},"PeriodicalIF":5.0,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903902","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}