Engineering Fracture Mechanics最新文献

{"title":"Coupled chemical–mechanical damage modeling of hydrogen-induced material degradation","authors":"Berk Tekkaya ,&nbsp;Jiaojiao Wu ,&nbsp;Michael Dölz ,&nbsp;Junhe Lian ,&nbsp;Sebastian Münstermann","doi":"10.1016/j.engfracmech.2024.110751","DOIUrl":"10.1016/j.engfracmech.2024.110751","url":null,"abstract":"<div><div>The automotive industry faces significant challenges in achieving climate targets and becoming CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> neutral. To reduce the weight of body in white specially in electrical vehicles, advanced high-strength and ultra-high-strength steels are utilized. These steels must resist hydrogen-induced softening and ductile/cleavage damage during the production process. A stress-state dependent coupled chemical–mechanical damage mechanics model is developed in implicit and explicit versions to predict hydrogen-induced damage in CP1000 steel. In-situ Slow-Strain-Rate-Tests under hydrogen loading serve to validate the model and show the significant impact of stress-state on hydrogen diffusion. Both models accurately predict damage initiation, evolution, and fracture under hydrogen influence.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110751"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cyclic-fatigue crack growth in polymer composites: Data interpretation via the Hartman-Schijve methodology","authors":"Silvain Michel ,&nbsp;Anthony J. Kinloch ,&nbsp;Rhys Jones","doi":"10.1016/j.engfracmech.2024.110743","DOIUrl":"10.1016/j.engfracmech.2024.110743","url":null,"abstract":"<div><div>The European Structural Integrity Society (ESIS), Technical Committee 4 (TC4), has initiated a Round-Robin program on the Mode I delamination growth in a continuous carbon-fibre reinforced-plastic (CFRP) composite under fatigue loading, using Mode I double-cantilever (DCB) tests. The present paper shows that the Hartman-Schijve equation, determined with test data generated under <em>R</em> = 0.1, can be used to compute the fatigue crack growth (FCG) associated with tests performed at <em>R</em> = 0.3, 0.5 and 0.7, where <em>R</em> is the load ratio (=<em>P</em>_min/<em>P</em>_max). Most importantly, the Hartman-Schijve methodology may be used to determine a worst-case upper-bound <em>da/dN</em> versus <span><math><mrow><mi>Δ</mi><msqrt><mrow><mi>G</mi></mrow></msqrt></mrow></math></span> FCG curve for small naturally-occurring delaminations in the CFRP.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110743"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fatigue life prediction of selective laser melted titanium alloy based on a machine learning approach","authors":"Yao Liu ,&nbsp;Xiangxi Gao ,&nbsp;Siyao Zhu ,&nbsp;Yuhuai He ,&nbsp;Wei Xu","doi":"10.1016/j.engfracmech.2024.110676","DOIUrl":"10.1016/j.engfracmech.2024.110676","url":null,"abstract":"<div><div>A machine learning (ML) approach is introduced to predict the high-cycle fatigue (HCF) life of selective laser melted (SLM) TA15 titanium alloy, addressing life prediction variability caused by defect characteristics and spatial distribution. Using HCF data, tensile properties, and defect characteristics across different building directions (BD), a training dataset was established. Comparative analysis shows that incorporating defect parameters significantly enhances the prediction accuracy of the ML model. Correlation analysis identified <em>A</em>_defect/<em>h</em> as highly relevant to fatigue life, enabling a refined training dataset. Incorporating this defect parameter significantly improved the ML model’s prediction accuracy. The <em>S-N</em> curve generated from predictions using defect values at 50 % reliability appeared relatively conservative compared to the experimental <em>S-N</em> median curve. The <em>S-N</em> curve at ± 3<em>σ</em> reliability closely aligned with experimental results, encompassing nearly all data points. This highlights the potential of the ML approach in predicting fatigue life for SLM titanium alloys.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110676"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165303","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 crack-bridging model considering microstructural randomness in biological composite materials","authors":"Yi Yan ,&nbsp;Xin-Yu Li ,&nbsp;Cheng-Yuan Zhang ,&nbsp;Xiao-Wen Lei ,&nbsp;Zi-Chen Deng","doi":"10.1016/j.engfracmech.2024.110687","DOIUrl":"10.1016/j.engfracmech.2024.110687","url":null,"abstract":"<div><div>The macroscopic mechanical properties of biological composite materials, such as strength and fracture toughness, are determined by both their constituents and microstructure. Conventional researches often assume that these properties can be modeled using representative volume elements that features microstructural periodicity. However, in reality, such periodicity is absent, and the mechanical and geometric properties of the constituents exhibit spatial randomness, profoundly affecting the material’s macroscopic behavior. In this study, we modify the classic crack-bridging model to account for microstructural randomness. Using the brick–mortar microstructure of nacre as an example, we investigate how microstructural randomness influences macroscopic fracture toughness and the mechanical properties of the crack-bridging zone. The results demonstrate that microstructural randomness weakens macroscopic fracture toughness, in line with the classic weakest-link principle. However, the randomness in macroscopic fracture toughness is significantly reduced compared to microstructural randomness, suggesting that the weakening effect induced by microstructural randomness is suppressed. Further analysis reveals that as the length of platelets increases, the weakening effect of microstructural randomness becomes less significant. This indicates that the microstructural stress transfer mechanism is responsible for suppressing the negative impact of microstructural randomness. Beyond the conventional strengthening and toughening effects, our results highlight a new advantage of well-designed microstructures in biological materials, offering deeper insights into how microscopic heterogeneity influences the macroscopic fracture toughness of these materials.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110687"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An analytical model for predicting the shear fracture behavior of discontinuities with multi-scale asperities incorporating the damage element method","authors":"Chaoyang Zhang,&nbsp;Chong Jiang,&nbsp;Li Pang","doi":"10.1016/j.engfracmech.2024.110706","DOIUrl":"10.1016/j.engfracmech.2024.110706","url":null,"abstract":"<div><div>Asperities within discontinuities play a critical role in contributing to shear resistance. However, their influence on the shear fracture behavior of discontinuities is constrained by size effects. Revealing and predicting the fracture process of discontinuities with multi-scale asperities is crucial for guiding engineering stability assessment. In this study, PFC^2D was employed to simulate the microscopic fracture process of discontinuities with multi-scale asperities under shear loading conditions. The simulation revealed that first-order asperities predominantly experience wear failure, whereas second-order asperities primarily undergo shear failure. Based on these findings, the damage evolution equation for the microscopic elements of first-order asperities was formulated using classical wear theory, while the equation for second-order asperities employed Weibull distribution statistical theory. Consequently, an analytical model was developed that considers the influence of multi-scale asperities on the shear behavior of discontinuities incorporating the damage element method. Subsequently, this analytical model was validated against experimental data and numerical results, demonstrating its capability to accurately predict the rapid stress decrease following the peak point. Finally, the sensitivity of the model parameters was discussed.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110706"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165316","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":"Recognition of the cracking pattern of reinforced concrete due to 3D non-uniform corrosion under vertically varying marine exposure conditions","authors":"Yiquan Chen ,&nbsp;Guangda Pei ,&nbsp;Shengtao Zhen ,&nbsp;Hetao Hou ,&nbsp;Yifeng Ling ,&nbsp;Qifang Liu","doi":"10.1016/j.engfracmech.2024.110792","DOIUrl":"10.1016/j.engfracmech.2024.110792","url":null,"abstract":"<div><div>Cover cracking of concrete structures due to reinforcing corrosion is a crucial indicator of deterioration in their mechanical properties and plays a key role in corrosion diagnosis. Despite extensive research on two-dimensional (2D) non-uniform corrosion on cross-sections, there remains a significant gap in simulation models that capture its longitudinal variations on steel reinforcement. This limitation significantly hinders the accurate identification of crack patterns and the subsequent determination of corrosion conditions, especially under vertical variations in marine exposure conditions. This paper thereby presents a newly developed three-dimensional (3D) multi-peak Gaussian model capable of representing temporal non-uniform corrosion distributions both across cross-sections and along the longitudinal direction of steel reinforcement. By utilizing the cohesive zone model-based extended finite element method (XFEM), this study has elucidated crack patterns associated with corrosion configurations, from highly localized to more uniform distributions. The investigation of crack paths and characteristics, including initiation angle, width, and tortuosity, was validated through accelerated corrosion tests and experimental findings from the literature. These observations highlight the correlation between corrosion distribution and crack morphology, providing a foundational basis for enhanced corrosion diagnosis through concrete cracking analysis.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110792"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164614","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 damage characteristics and fracture mechanisms of coal under high stress environment during blasting","authors":"Xin Zhang ,&nbsp;Zegong Liu ,&nbsp;Shuai Chang ,&nbsp;Yonglin Xue ,&nbsp;Jianyu Zhang","doi":"10.1016/j.engfracmech.2024.110772","DOIUrl":"10.1016/j.engfracmech.2024.110772","url":null,"abstract":"<div><div>When using blast fracturing technology to enhance the permeability of deep coal seams, high in-situ stress makes it difficult for cracks to propagate between blast holes, posing a significant challenge for gas management in deep mines. This study combines theoretical analysis and numerical simulations to investigate the crack propagation behaviour and coalescence mechanisms of coal under various in-situ stress conditions. A theoretical model is first developed for single hole blasting to analyse the static stress distribution around the blast hole and the dynamic stress changes under blast loading. The influence of tangential static stress on crack propagation and coalescence is further investigated for simultaneous double hole initiation. The calibration of parameters in the Riedel-Hiermaier-Thoma (RHT) model for coal is performed using empirical formulas and dynamic mechanical tests, with numerical model validation conducted against fracture size distributions obtained from laboratory tests. Finally, the crack propagation and coalescence induced by single blasting and double hole blasting under varying in-situ stress conditions are simulated. The numerical results show that in-situ stress significantly suppresses both the length and number of blast-induced cracks, reducing the fractal dimension of coal damage. For double hole blasting, an angle of less than 30° between the blast hole connection line and the major principal stress direction facilitates the formation of inter-hole crack coalescence zones between the holes. Based on theoretical analysis and numerical results, it is suggested that aligning blast holes along the principal stress direction enhances permeability improvement in coal seams under high in-situ stress conditions. This study not only provides new insights into the mechanisms of crack propagation in coal blasting but also offers guidance for optimizing coal seam permeability enhancement under high in-situ stress conditions.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110772"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164615","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 growth life prediction for butt-welded joints under block spectrum loading based on the modified strip-yield model","authors":"Saisai He,&nbsp;Tian Xu,&nbsp;Dongfang Zeng,&nbsp;Liantao Lu","doi":"10.1016/j.engfracmech.2024.110761","DOIUrl":"10.1016/j.engfracmech.2024.110761","url":null,"abstract":"<div><div>To achieve quantitative prediction of fatigue crack growth life in welded structures under block spectrum loading, this study develops a prediction model for fatigue crack growth life in butt-weld joints based on the weight function method and the modified strip-yield model, which takes into account residual stresses and load history effects. Fatigue crack growth tests were conducted on butt-welded joints with surface defects under various loading spectra using the commonly used 16MnDR steel for railway welded bogies, to verify the applicability of the prediction model. The results show that the model can accurately predict butt-welded joints’ fatigue crack growth life. Compared to the traditional NASGRO equation, this model can effectively simulate the crack closure behavior introduced by load history, providing higher accuracy and reliability in predicting the fatigue life of butt-welded joints. The life prediction method developed in this study offers a theoretical guidance for the damage tolerance design and inspection interval optimization of welded structures.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110761"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164616","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 different CFRP strengthening methods on fracture parameters of concrete beam","authors":"Jueding Liu ,&nbsp;Xiangqian Fan ,&nbsp;Li Zou ,&nbsp;Chenyu Shi","doi":"10.1016/j.engfracmech.2024.110748","DOIUrl":"10.1016/j.engfracmech.2024.110748","url":null,"abstract":"<div><div>In order to investigate the effect of CFRP strengthening methods on the fracture performance of concrete structure with cracks, the fracture experiments of concrete beams with cracks strengthened by different CFRP bonding layers and prestressed CFRP were carried out in this paper. The formula for the fracture parameters of CFRP strengthened concrete beam was given by the analytical method, and the variation rules of the fracture parameters and AE parameters were analyzed by combining the acoustic emission (AE) technique. The experiment results show that, when the number of CFRP bonding layers is 3 or 4, the fracture failure behavior of concrete beams is similar to the “over-reinforced damage” mode, which is not conducive to the design and application of practical engineering. The variation rules of ultimate load, crack extension length, fracture toughness and fracture energy are analyzed, which is pointed out that bonded single-layer prestressed CFRP has the optimal strengthening effect and crack-resistant performance for concrete beam with crack. The fracture damage variables are characterized by the change rate of crack propagation length and AE energy. It is found that the damage evolution curve showed a three-stage pattern of inverted “<em>S</em>” and positive “<em>S</em>” shapes, which explains the damage and fracture behavior of CFRP strengthened concrete beam and verifies the feasibility of AE parameter characterization of damage effects.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110748"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165001","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":"Coupled effect of corrosion and fatigue on the service life of steel cables","authors":"Jian Guo ,&nbsp;Xiongwei Zhang","doi":"10.1016/j.engfracmech.2024.110698","DOIUrl":"10.1016/j.engfracmech.2024.110698","url":null,"abstract":"<div><div>Steel cables, as the main load-bearing components of cable-supported bridges, are prone to corrosion, mechanical influences, and their coupling effects, leading to fatigue failure. This paper proposes a comprehensive fatigue failure simulation method for steel cables, quantitatively studying the service life of steel cables under the combined effects of corrosion and fatigue. Based on the principles of electrochemical corrosion, the pit growth law during the corrosion stage is derived considering the influence of current and stress during the corrosion process. Subsequently, an improved Paris formula is employed to describe the crack growth rate during the crack growth stage, and relevant parameters are calculated based on experimental data to establish a steel wire failure model. Building upon this, a simulation method for the failure process of steel cables is proposed, emphasizing the discrete properties of the material and obtaining the fatigue life of the steel wires. Through fatigue life test data, the accuracy of the method is validated.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110698"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165311","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}