Engineering Fracture Mechanics最新文献

{"title":"The influence of rolling process on fatigue properties of 316L/2Cr13 multilayered steel and analysis of its fracture process","authors":"Xin Zhou ,&nbsp;Rui Cao ,&nbsp;Jingping Ma ,&nbsp;Xiaoxia Jiang ,&nbsp;Yingjie Yan","doi":"10.1016/j.engfracmech.2024.110726","DOIUrl":"10.1016/j.engfracmech.2024.110726","url":null,"abstract":"<div><div>In order to investigate the effect of the rolling process on the fatigue properties of 316L/2Cr13 Multilayered Steel (MLS), high-cycle fatigue tests of MLS at a stress ratio of 0.1 are performed on the universal testing machine. The MLS composed of the austenitic stainless steel 316L and martensitic stainless steel 2Cr13 is prepared by accumulative roll-bonding (ARB). Furthermore, MLS is prepared under a variety of rolling temperatures and rolling sequences. The changes of microstructure and properties as well as fracture mechanism are analyzed by means of Scanning Electron Microscope (SEM), Electron Back Scatter Diffraction (EBSD), tensile tests, fatigue tests and interruption tests. The results reveal that in contrast to the full martensite and full austenitic MLS, the fatigue properties of 316L/2Cr13 MLS are improved. When the rolling process is “1130℃ 4 + 6 passes” and “1200℃ 10 passes”, the MLS possesses the optimal performance. In addition, the fatigue strength of MLS first increases and then decreases with the increase of tensile strength. Interruption test shows that the fatigue crack of multilayered steel starts from ferrite phase of 2Cr13 layer. When the crack propagates, if there are cracks initiated by adjacent 2Cr13 layers near the crack tip, the crack will connect and accelerate the propagation rate.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110726"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165863","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 and numerical simulation study of rough jointed rock samples under triaxial compression conditions","authors":"Renliang Shan,&nbsp;Nianzeng Liu,&nbsp;Peng Sun,&nbsp;Ziyue Zhao,&nbsp;Ruiyu Dong,&nbsp;Haoyu Dou,&nbsp;Haozhe Meng,&nbsp;Yao Bai","doi":"10.1016/j.engfracmech.2024.110707","DOIUrl":"10.1016/j.engfracmech.2024.110707","url":null,"abstract":"<div><div>The presence of joint planes significantly affects the mechanical properties of rock and poses a threat to the safety of engineering construction. To examine the influence of Joint Roughness Coefficient (<em>JRC</em>) and joint plane inclination on the mechanical behavior of jointed rock masses, this research employed 3D printing technology to fabricate jointed rock samples with varying <em>JRC</em> and joint inclination angles. Triaxial compression tests were then conducted on these samples in the laboratory. The results indicate that an increase in <em>JRC</em> strengthens the serrated interlocking effect of joint planes, leading to a corresponding increase in both the peak failure strength and elastic modulus of samples with different inclination angles. For samples with the same <em>JRC</em>, the peak strength initially decreases with increasing inclination angle, followed by a subsequent rise. The variation trend of Poisson’s ratio, however, shows the opposite pattern. The joint inclination significantly impacts the failure mode of the samples. However, as <em>JRC</em> changes, the failure mode does not show significant variation. Furthermore, drawing from the laboratory test results, numerical simulations were performed using the Particle Flow Code in 2 Dimensions (PFC2D) to analyze mesoscopic crack propagation mechanisms in jointed rock models subjected to triaxial compression. Finally, this research discusses the effects of <em>JRC</em> and joint plane inclination on the anisotropic characteristics of jointed samples and offers a detailed analysis of the failure mechanisms.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110707"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165864","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":"Two-dimensional weight function of stress intensity factors for surface cracks emanating from weld toes of butt-welded plates","authors":"Mengqi Gu ,&nbsp;Wanlin Guo","doi":"10.1016/j.engfracmech.2024.110723","DOIUrl":"10.1016/j.engfracmech.2024.110723","url":null,"abstract":"<div><div>The two-dimensional weight function method, which is proposed by Wang and Glinka (2009), is adopted here to calculate stress intensity factors for surface cracks emanating from weld toes of butt-welded plates with different toe angles. Two-dimensional point load weight function is derived based on reference stress intensity factors and accurate stress distribution on virtual crack face obtained from comprehensive finite element analyses. The obtained weight function is validated against finite element calculations and shows high accuracy. Explicit fitted empirical formulae are obtained for semi-elliptical surface cracks with wide ranges of crack aspect ratio <span><math><mrow><mn>0.2</mn><mo>⩽</mo><mrow><mi>a</mi><mo>/</mo><mi>c</mi></mrow><mo>⩽</mo><mn>1.0</mn></mrow></math></span>, crack depth ratio <span><math><mrow><mn>0.2</mn><mo>⩽</mo><mrow><mi>a</mi><mo>/</mo><mi>B</mi></mrow><mo>⩽</mo><mn>0.9</mn></mrow></math></span>, crack angular parameter <span><math><mrow><mn>0.05</mn><mrow><mrow><mo>⩽</mo><mn>2</mn><mi>ϕ</mi></mrow><mo>/</mo><mi>π</mi></mrow><mo>⩽</mo><mn>0.95</mn></mrow></math></span>, at weld toes with toe angles <span><math><mrow><mi>φ</mi><mo>=</mo><msup><mn>0</mn><mo>°</mo></msup><mrow><mtext>,</mtext><mspace></mspace></mrow><msup><mn>15</mn><mo>°</mo></msup><mrow><mtext>,</mtext><mspace></mspace></mrow><msup><mn>30</mn><mo>°</mo></msup><mo>,</mo><msup><mn>45</mn><mo>°</mo></msup></mrow></math></span> and toe radius ratio <span><math><mrow><mrow><mi>r</mi><mo>/</mo><mi>B</mi></mrow><mo>=</mo><mn>0.0</mn><mo>,</mo><mn>0.1</mn><mo>,</mo><mn>0.2</mn><mo>,</mo><mn>0.3</mn></mrow></math></span> for quick fatigue crack growth prediction in engineering structures providing a foundation for durability and damage tolerance design. It is shown that sharp transition (<span><math><mrow><mrow><mi>r</mi><mo>/</mo><mi>B</mi></mrow><mo>=</mo><mn>0.0</mn></mrow></math></span>) between the weld toe and the base metal will lead to a significant increase of weight function coefficient <em>M</em> at the front of shallow cracks (<span><math><mrow><mrow><mi>a</mi><mo>/</mo><mi>B</mi></mrow><mrow><mspace></mspace><mtext>= 0.02</mtext></mrow></mrow></math></span>) near the surface.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110723"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165865","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 two-dimensional adaptive non-uniform discretization bond-based peridynamics for static and dynamic fracture in brittle materials","authors":"Xiao-Ping Zhou ,&nbsp;Er-Bao Du","doi":"10.1016/j.engfracmech.2024.110725","DOIUrl":"10.1016/j.engfracmech.2024.110725","url":null,"abstract":"<div><div>In this paper, a two-dimensional adaptive non-uniform discretization bond-based peridynamics is proposed, aimed at investigating the fracture behavior of brittle materials under static and dynamic conditions. The proposed method is grounded in Delaunay triangular discretization and utilizes the self-similarity principle to refine the damage location. The new contribution of this work is that the non-uniform discretization of computational domain can be achieved without knowing the crack propagation path in advance, and the adaptive refinement of the damage position through the proposed method can be better realized. Four numerical cases of static or dynamic fracture under two-dimensional conditions are investigated, and the numerical results obtained by the proposed method are in good agreement with those obtained by non-uniform discrete peridynamic methods with knowing crack propagation path in advance and other numerical methods, such as DYNA3D. The results show that the proposed method can well realize the tracking of crack propagation paths, and can handle problems such as dynamic fracture, complex structural fracture, multi-crack interaction, and so on.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110725"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165918","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":"In-situ experimental investigation of the small fatigue crack behavior in CP-Ti: The influence of loading parameters and directions","authors":"Jingwei Li ,&nbsp;Le Chang ,&nbsp;Dalin Zheng ,&nbsp;Zhuowu Wang ,&nbsp;Wei Zhang ,&nbsp;Yu Ji ,&nbsp;Changyu Zhou","doi":"10.1016/j.engfracmech.2024.110722","DOIUrl":"10.1016/j.engfracmech.2024.110722","url":null,"abstract":"<div><div>This study quantitatively investigates the influence of loading parameters and directions on the behavior of small fatigue cracks (SFC) in commercially pure titanium (CP-Ti). It is observed that reductions in peak stress and increases in stress ratio correlate with a decrease in SFC growth rate and an intensification of growth rate fluctuations. Notably, crack growth along the transverse direction (TD) generally exhibits lower rates compared to that along the rolling direction (RD), with more pronounced fluctuations. Through metallographic analysis of crack paths, roughness-induced crack closure (RICC) is identified as a significant factor contributing to the observed variations in SFC growth behavior under different loading conditions. Furthermore, electron backscatter diffraction (EBSD) characterization reveals that crack propagation along the RD is primarily governed by prismatic slip, while TD samples exhibit more engagement of non-prismatic slip systems with higher activation stress. This results in a more tortuous crack path and pronounced crack arrest phenomena. Finally, a modified multi-scale rate prediction model based on the reference stress ratio method is proposed. Comparative analysis demonstrates that the modified model outperforms existing models by offering enhanced predictive capability across diverse loading conditions, thereby reinforcing its robustness in predicting SFC behavior of CP-Ti.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110722"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165922","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":"Parameter investigation and efficiency evaluation of unified phase-field theory in mesoscale fracture analysis of fully-graded concrete under uniaxial tension","authors":"Xiangnan Qin ,&nbsp;Xin Wang ,&nbsp;Jinjun Guo ,&nbsp;Bo Xu ,&nbsp;Weiqi Lin ,&nbsp;Kun Wang ,&nbsp;Xudong Chen","doi":"10.1016/j.engfracmech.2024.110696","DOIUrl":"10.1016/j.engfracmech.2024.110696","url":null,"abstract":"<div><div>This study investigates the parameter sensitivity and computational efficiency of the Phase-field Cohesive Zone Model (PF-CZM) for mesoscale fracture behavior simulation of fully-graded concrete under uniaxial tension. The developed mesoscale model exhibits relatively low mesh sensitivity and successfully captures the complete crack propagation path from damage initiation to ultimate failure in concrete. By integrating classical experimental results, this study evaluates the influence of computational parameters on the simulation results of fully-graded concrete specimens, including time-stepping, convergence tolerance, length scale parameter and mesh element size. The findings indicate that the mechanical response and energy variation of concrete during the plastic and softening stages are closely related to the time-stepping, while the computational efficiency is highly dependent on both time-stepping and convergence tolerance. Furthermore, the effective preferences are recommended for these computational parameters. Based on the evaluation results of the obtained parameters, the adjusted mesoscale model primarily shows dispersed cracks randomly distributed around the aggregates in the vertical direction, without excessive localized discrete damage. The unified phase-field damage theory was systematically validated for its applicability and effectiveness in heterogeneous quasi-brittle materials during this process.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110696"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165924","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 prediction of aluminum alloy fatigue crack growth rate based on class incremental learning and multi-dimensional variational autoencoder","authors":"Yufeng Peng ,&nbsp;Yongzhen Zhang ,&nbsp;Lijun Zhang ,&nbsp;Leijiang Yao ,&nbsp;Xiaoyan Tong ,&nbsp;Xingpeng Guo","doi":"10.1016/j.engfracmech.2024.110721","DOIUrl":"10.1016/j.engfracmech.2024.110721","url":null,"abstract":"<div><div>Aluminum alloys, valued for their low density and high strength-to-weight ratio, are crucial in the aerospace industry. To enhance their security and maintenance economy in service, this work employs a class incremental learning method (CIL) to predict the fatigue crack growth rate of 2xxx and 7xxx series aluminum alloys. The developed multi-dimensional autoencoder class incremental learning and data update monitoring feature enhanced prediction model (MDACIL-RTM-FIEP) integrates mechanical, environmental, and material features using variational autoencoders (VAE) for deep feature learning. Results show that the model, through the data update monitoring and incremental triggering mechanism (DUM-IT), adapts effectively to data changes, significantly enhancing prediction accuracy. The model’s fatigue crack growth rate (FCGR) incremental learning accuracy (IAC) improved to 0.9644 from 0.8715, and its backward transfer (BT) value decreased to −0.0182 from −0.6325, indicating excellent adaptability of new knowledge and retention of old knowledge. It also addresses the “catastrophic forgetting” issue, underscoring the effectiveness of CIL strategies in dynamic data environments.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110721"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166100","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":"The influence of biaxial loads on the dynamic crack interaction of two opposite propagating","authors":"Shengnan Xu,&nbsp;Zhongwen Yue,&nbsp;Peng Wang,&nbsp;Xingyuan Zhou,&nbsp;Meng Ren,&nbsp;Haoyang Jiang","doi":"10.1016/j.engfracmech.2024.110732","DOIUrl":"10.1016/j.engfracmech.2024.110732","url":null,"abstract":"<div><div>The depletion of shallow resources has prompted mining activities to move deeper regions, and the presence of geostress significantly affects the propagation behavior of cracks. However, the propagation law and underlying mechanism of explosive cracks under different biaxial stress fields remain unclear. This study employs dynamic photoelastic testing method to achieve stress visualization and applies different biaxial loads to epoxy resin specimens. It simulates the propagation behavior of two opposite propagating explosive cracks under different geostress conditions and examines the effects of explosive stress waves and stress fields at crack tips on nearby cracks. The results indicate that during the interaction phase of cracks, there are Type I circular fringes dominated by <span><math><msubsup><mi>K</mi><mi>I</mi><mi>d</mi></msubsup></math></span>, characterized by small in the middle and large on both sides of the photoelastic fringes, while Type II circular fringes dominated by <span><math><msubsup><mi>K</mi><mrow><mi>II</mi></mrow><mi>d</mi></msubsup></math></span>, exactly the opposite; Under the same conditions, the inhibitory effect of the pressure in the direction of vertical crack propagation is greater than the promoting effect of that of parallel crack propagation; The final propagation direction of the main crack is basically the same as the propagation direction of the explosive stress wave and the maximum principal stress. The research results contribute to reveal the dynamic propagation law of cracks under high geostress and provide strong support for the engineering application of directional fracture blasting.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110732"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166102","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 characteristics and YOLO automated crack detection of fissured rock masses under true-triaxial mining unloading conditions","authors":"Wenpu Li ,&nbsp;Zhao Gao ,&nbsp;Guorui Feng ,&nbsp;Ruiqing Hao ,&nbsp;Yuguo Zhou ,&nbsp;Yaoguang Chen ,&nbsp;Shilong Liu ,&nbsp;Huan Zhang ,&nbsp;Tao Wang","doi":"10.1016/j.engfracmech.2024.110790","DOIUrl":"10.1016/j.engfracmech.2024.110790","url":null,"abstract":"<div><div>The study of mechanical properties and quantitative characterization of fissured rock masses under mining unloading conditions is crucial for ensuring the safety of underground engineering excavations. Research on the strength characteristics and damage features of rock bodies with different inclination angles of cracks under true-triaxial unloading conditions, and analyse the influence of the path on the fissure extension rules. Simultaneously, based on the YOLO (You Only Look Once) object detection model, an automatic crack detection method with a deep learning model of computer vision is proposed. The study indicates that rock masses with a single fissure exhibit lower peak strength and failure strain under unloading conditions. The stress–strain curves and strength properties of the constant axial pressure single-sided unloaded specimens at the same inclination have similarities, and the response of the incremental axial pressure single-sided unloading to the external load is relatively slow. Under the same stress path, the peak strength of the specimens tends to increase with the greater fissure dip angle, and the peak strength and strain show greater sensitivity to changes in the stress path. The crack types of the specimens after unloading damage were classified into two types of tensile cracks, three types of shear cracks, two types of far-field cracks, and surface spalling, and their damage characteristics were analyzed. The accuracy, recall, and mean average precision of the proposed quantitative characterization detection model for fissures exceed 80%, and it can effectively improve the intelligent recognition of the fissure rock rupture process with good robustness by training the fissure rock rupture images under unloading conditions. This study has important guiding significance for rock damage monitoring in deep engineering_.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110790"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164563","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 simple criterion to exclude the risk of brittle fracture in the brittle-to-ductile transition temperature range","authors":"D. Clement ,&nbsp;C. Jacquemoud ,&nbsp;S. Chapuliot ,&nbsp;S. Marie","doi":"10.1016/j.engfracmech.2024.110739","DOIUrl":"10.1016/j.engfracmech.2024.110739","url":null,"abstract":"<div><div>This paper presents the use of a simple threshold stress criterion to exclude the risk of brittle fracture in the brittle-to-ductile transition temperature range of carbon-manganese ferritic steel. In order to compare its predictions for laboratory specimens as well as for structures, fracture tests on CT specimens and three pipe structures representative of the in-service auxiliary piping system of French PWR, were analysed. In association with Finite Element analyses, this criterion allowed the authors to predict a lower bound of the non-fracture threshold.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110739"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164995","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}