Engineering Fracture Mechanics最新文献

{"title":"Interpretation of uniaxial creep damage properties and rupture life considering local necking via an inverse approach","authors":"M. Li ,&nbsp;R.Q. Guo ,&nbsp;B. Zhou ,&nbsp;X.F. Gong ,&nbsp;Z.X. Wen ,&nbsp;Z.F. Yue ,&nbsp;W. Sun","doi":"10.1016/j.engfracmech.2024.110735","DOIUrl":"10.1016/j.engfracmech.2024.110735","url":null,"abstract":"<div><div>Tertiary creep-induced local necking, which occurs during uniaxial creep tests for creep-ductile materials, has been a long-term concern in the interpretation of creep rupture life under both constant load and constant stress conditions. In this study, a set of short-term, high stress regime, creep rupture tests, in a range of stress and temperature, for a newly developed tempered martensitic MarBN steel, were used to understand the necking mechanics and the underlying deformation mechanisms. An FE-based, inverse approach is developed to determine the full stage creep damage properties under large deformation conditions, utilizing the measured deformed shapes of local necking within the inverse optimization scheme. On this basis, a temperature-dependent empirical relationship of the creep rupture lives between constant load and constant stress creep rupture tests is established. As a demonstration, the feasibility and accuracy of the proposed relationship was evaluated through a benchmark case using the data from the G115 martensitic steel creep tests. The implications of this relationship for broader and more general conditions (e.g., stress range, temperature, materials) and practical applications are discussed.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110735"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164994","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":"Phase field fracture modeling of mechanical degradation and crack propagation in random porous sintered nano-silver with thermal and strain-rate effects","authors":"Xu Long ,&nbsp;Jiaqi Zhu ,&nbsp;Yutai Su ,&nbsp;Yi Yan ,&nbsp;Chao Chang ,&nbsp;Hongqiang Zhang ,&nbsp;Valentina Salomoni","doi":"10.1016/j.engfracmech.2024.110753","DOIUrl":"10.1016/j.engfracmech.2024.110753","url":null,"abstract":"<div><div>Sintered nano-silver, known for its superior thermal properties, is increasingly vital for dissipating heat in high-power electronic devices. This study explores how temperature (25–200 °C) and strain rates (1 × 10^-1–1 × 10^-5 s⁻¹) affect the mechanical properties and crack propagation in this material. Experiments and simulations, using shear tests on lap specimens and a phase field fracture model that accounts for energy contributions from temperature and strain rate, reveal significant insights. Below 100 °C, mechanical strength is primarily reduced by temperature softening, with little change in porosity. Above 100 °C, a re-sintering process triggered by thermal energy alters the material’s mesoscopic structure. Despite consistent porosity across tests at various strain rates, an increase in shear strength underlines the material’s sensitivity to strain rate changes. The model further shows that while strain energy remains fairly constant across temperatures, the contribution from thermal energy peaks and then diminishes as temperature rises, inversely affecting shear strength. Conversely, higher strain rates reduce the energy contributions from both strain and rate, decreasing energy-driven fractures and boosting strength. The model successfully predicts crack propagation patterns in tested specimens, validating its effectiveness in assessing the mechanical behavior of sintered nano-silver.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110753"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165262","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 adaptive peridynamic framework for modeling large deformation and fracture behavior of hyperelastic materials","authors":"D.A. Abdoh","doi":"10.1016/j.engfracmech.2024.110709","DOIUrl":"10.1016/j.engfracmech.2024.110709","url":null,"abstract":"<div><div>Accurate prediction of deformation and fracture behaviors of hyperelastic materials is crucial in engineering applications and industry. The paper presents a new three-dimensional computational model to simulate large deformations and fractures in hyperelastic materials using the peridynamic method. The main innovation of the proposed three-dimensional hyperelastic peridynamic (3D-HPD) model lies in its incorporation of the stress–strain relationship of hyperelastic materials into the peridynamic framework. Therefore, the peridynamic parameters, such as bond stiffness and strength, are dynamically updated based on the instantaneous value of Young's modulus derived from the stress–strain relation of hyperelastic materials. The 3D-HPD model highlights the following novelties: 1) The 3D-HPD model directly employs the stress–strain relation for each peridynamic bond. Thus, the large deformations and fractures in hyperelastic materials are accurately captured in three dimensions by integrating the responses in all peridynamic bonds; 2) Unlike other models that may require specific hyperelastic formulations, the 3D-HPD model offers a more straightforward application, enhancing usability and reducing complexity; 3) The 3D-HPD model is capable of simulating the response of hyperelastic materials under various loading conditions, including tensile, torsional, and lateral loadings. We confirm the validity of the 3D-HPD model by evaluating it against experimental measurements and observations. For the first time, the model examines hyperelastic materials' fracture and deformation behaviors under combined loading conditions. The new findings of the mechanical performance of hyperelastic materials under multi-axial stresses provide new insights to enhance their design and usage.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110709"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165313","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":"On the use of representative specimens for the structural integrity assessment of safety-relevant rotating components","authors":"Jiangchao Zhu ,&nbsp;Mauro Madia ,&nbsp;Michael Schurig ,&nbsp;Julius Kruse ,&nbsp;Fabian Conrad ,&nbsp;Hartmut Schlums ,&nbsp;Christian Kontermann ,&nbsp;Uwe Zerbst","doi":"10.1016/j.engfracmech.2024.110710","DOIUrl":"10.1016/j.engfracmech.2024.110710","url":null,"abstract":"<div><div>Safety-relevant components, for which a failure in service could have catastrophic consequences, are usually designed for extremely low probability of failure and they are subjected to stringent part qualification procedures according to guidelines set by regulatory agencies. Manufacturers are often forced to perform tests on full scale or scaled components to ensure the structural integrity under defined loading conditions, which usually implies a huge experimental and financial effort. Therefore, companies try to develop new strategies such as digital twins, which allow to massively reduce costs, without compromising safety. This work presents a new quasi-static testing and assessment concept, the main idea of which is to replace, or at least reduce, the experimental testing on components by testing specimens representative of the component.</div><div>Fracture mechanics specimens have been designed iteratively by numerical simulations to match the stress state at the crack-tip of the maximum permissible defect defined by regulatory agencies for the component. Potentially, the major benefit of the proposed approach is that the tests can be performed on conventional laboratory testing machines. The effectiveness of the methodology is demonstrated in case of the structural integrity assessment of a Ni-base superalloy aero-engine turbine disk at overspeed conditions.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"314 ","pages":"Article 110710"},"PeriodicalIF":4.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165920","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":"A modified Weibull stress model to predict cleavage fracture of small punch test specimens","authors":"Zilong Xia ,&nbsp;Jiru Zhong ,&nbsp;Xinfu He ,&nbsp;Kaishu Guan ,&nbsp;Bintao Yu","doi":"10.1016/j.engfracmech.2025.110901","DOIUrl":"10.1016/j.engfracmech.2025.110901","url":null,"abstract":"<div><div>The small punch test (SPT) has advantages in obtaining mechanical properties of metallic materials in the International Fusion Materials Irradiation Facility. However, the significant difference in stress states between conventional specimens and SPT specimens brings challenges for SPT to estimate cleavage fracture toughness of materials. The present work proposed a modified Weibull stress model to predict the cleavage fracture of SPT specimens. In this model, the mutual effects of plastic strain and stress triaxiality on the nucleation and instability of micro defects were considered, and a concept of double threshold criteria was also proposed to redefine the fracture process zone considering the large-scale yield and low constraints of small specimens. The model successfully predicted the cumulative failure probability of cleavage fracture for notched SPT specimens at −160 ℃ and −170 ℃, demonstrating the dependence of the cleavage fracture driving force on plastic strain and stress triaxiality. This study provides a fundamental study for using SPT to predict the cleavage fracture behavior of ferritic steels.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110901"},"PeriodicalIF":4.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372141","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":"Investigating the fracture behaviors of asphalt mixtures at the intermediate temperature considering the detection of crack initiation","authors":"Weimin Song,&nbsp;Wenlong Yan,&nbsp;Zhicai Cui,&nbsp;Xiaobao Chen,&nbsp;Hao Wu","doi":"10.1016/j.engfracmech.2025.110892","DOIUrl":"10.1016/j.engfracmech.2025.110892","url":null,"abstract":"<div><div>Crack initiation detection is of crucial significance for comprehending the entire fracture process behaviors, encompassing crack initiation and propagation. In the present study, strain gauges were utilized to detect crack initiation at a temperature of 25 °C, and the data related to crack initiation were employed for the calculations of the modified J-integral and modified fracture energy. Fracture energy was classified into three components: elastic energy, plastic energy, and surface energy. The improved fracture energy is the difference between the traditional fracture energy and the plastic energy. Semi-circular bending (SCB) tests were carried out on two types of asphalt mixtures, namely AC10 and AC16, with two distinct notch lengths of 15 mm and 30 mm. Crack mouth opening displacement (CMOD) was also recorded during the SCB tests. In addition, load-line-displacement (LLD) was also recorded. The results demonstrated that the peak of strain occurred earlier than that of the load, suggesting that specimens could endure further loads after the onset of a macro-crack. With the augmentation of notch length, the elastic energy, plastic energy, and surface energy decreased significantly for both AC10 and AC16. For both AC10 and AC16, approximately 70 % of the total energy was surface energy, which was utilized for crack propagation, and the proportion of plastic energy was lower than that of elastic energy. Plastic energy is predominantly employed for the plastic deformation of the asphalt binder. When the plastic energy was excluded from the total fracture energy, the disparity in fracture energy between specimens with different notch lengths was narrowed, indicating that the plastic energy was regarded as a key factor leading to the reduction in fracture due to the increased notch depth. When calculating the J-integrals using the data corresponding to crack initiation instead of the peak load data, the J-integrals decreased considerably, signifying that the surface energy within the range from crack initiation to the peak load point results in a significant increase in the J-integral. In comparison to AC16, AC10 exhibited higher J-integral, elastic energy, plastic energy, and surface energy, suggesting that AC10 demonstrated superior fracture resistance to crack initiation and propagation, which was mainly attributed to the porosity difference between AC10 and AC16 specimens. The load-LLD curves and load-CMOD curves generally exhibited a similar trend in energy parameters, while the load-CMOD curves manifested flatter curves within the descending phase.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110892"},"PeriodicalIF":4.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376686","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":"New method for uniaxial tensile test of UHPFRC","authors":"Gang Xu ,&nbsp;Nan Jia ,&nbsp;Yang Li ,&nbsp;Chengyao Li ,&nbsp;Yanzhou Peng","doi":"10.1016/j.engfracmech.2025.110900","DOIUrl":"10.1016/j.engfracmech.2025.110900","url":null,"abstract":"<div><div>In this study, we investigated the direct tensile test method of ultra-high performance fiber reinforced concrete. Proposed three evaluation indexes:Variation in the principal tensile stress rate <em>β</em>, uniformity of principal tensile stress <em>η</em>, and relative length of isostress area <em>γ</em> to evaluate the stress characteristics of specimens. Based on the stress analysis of the specimen, studied the influence of specimen shape, size and loading mode on the evaluation index of force characteristics, and designs a new UHPFRC-axis pull specimen test method for the goal of relieving stress concentration, and verifies the effectiveness of the new method. It is found that, the new specimen has a more random damage location and a more uniform stress distribution in the tensile test, and the success rate of testing the tensile strength after local reinforcement reaches 100%.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110900"},"PeriodicalIF":4.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379435","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":"Establishment and verification of anisotropic ductile fracture criteria applicable to AA6016-T4 incremental forming","authors":"Chengxin Liu ,&nbsp;Xingrong Chu ,&nbsp;Qi Xu ,&nbsp;Jiaqi Chen ,&nbsp;Zhenming Yue ,&nbsp;Lionel Leotoing","doi":"10.1016/j.engfracmech.2025.110906","DOIUrl":"10.1016/j.engfracmech.2025.110906","url":null,"abstract":"<div><div>In this study, modified GTN and DF2015 fracture criteria considering sheet anisotropy were established by uniaxial and cruciform tests with digital image correlation (DIC) system. Based on Nakazima and incremental forming tests, forming limit curves (FLCs) of AA6016-T4 were constructed, and the effectiveness of the modified ductile fracture criteria was verified. The results demonstrate that both the modified GTN and DF2015 criteria could accurately capture the sheet fracture behavior in the Nakazima tests. While for incremental forming, the modified DF2015 criterion significantly underestimates the sheet forming limit, and the modified GTN criterion presents a good prediction accuracy with experimental results.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110906"},"PeriodicalIF":4.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379350","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 dual strengthening strategy to improve the bending resistance of thin-walled bellows using prefabricated martensite and a gradient structure","authors":"Meng-ye Wang ,&nbsp;Meng Yan ,&nbsp;Huan-chao Zhang ,&nbsp;Yong Liu ,&nbsp;Hua-gui Huang","doi":"10.1016/j.engfracmech.2025.110902","DOIUrl":"10.1016/j.engfracmech.2025.110902","url":null,"abstract":"<div><div>In order to improve the bending resistance of bellows, in this study, the bellows microstructure was uniquely designed via an induction heat treatment process (IHTP). Thin-walled bellows with a gradient structure and martensite arranged along a preset path were prepared. Using a combination of experimental and material characterization methods, the microstructural characteristics of the matrix and their evolution during the bending process were studied, and the strengthening mechanism of the bending resistance of the IHTP bellows was revealed. The results showed that IHTP could be used to prepare bellows with a gradient grain size distribution (gradually refined along the wave peak toward the trough), increase the content of low-angle grain boundaries (LAGBs), and generate a large amount of lath martensite distributed along the ripple direction. The results of repeated bending testing and fracture morphology analysis showed that the stress of the material was more uniform due to the grain refinement in the trough of the IHTP bellows. Meanwhile, due to the brittleness of martensite, cracks propagated along the preset ripple direction, delaying the propagation of the main crack in the wall thickness direction and improving the bending number of the bellows. The maximum increase in the bending number for the IHTP bellows was nearly 300%, when compared with bellows designed via a general heat treatment process (GHTP). The fracture surface was characterized by small and dense dimples and local deep dimples. Additionally, the crack boundary was more tortuous, indicating that the crack propagation resistance increased, and the fracture form changed from transgranular fracture to intergranular fracture. This study provides a new method for improving the bending resistance of bellows.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110902"},"PeriodicalIF":4.7,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350274","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":"Examination and clarification of R ratio in fatigue delamination growth analysis of composite laminates with fiber bridging","authors":"Qingfeng Duan ,&nbsp;Dongfeng Cao ,&nbsp;Haixiao Hu ,&nbsp;Wei Cai ,&nbsp;Shuxin Li","doi":"10.1016/j.engfracmech.2025.110882","DOIUrl":"10.1016/j.engfracmech.2025.110882","url":null,"abstract":"<div><div>Combined experimental and comprehensive analytical approaches were used to investigate the correctness of various R ratio parameters in fatigue delamination growth analysis of composite laminates with fiber bridging. The investigation results indicated that the widely used displacement or load ratio is not the correct R ratio parameter, since correlation with Paris law and Hartmann and Schijve crack growth equations can produce up to three orders of magnitude difference in fatigue delamination growth rate. Consequently, the correct R ratio parameter based on the similitude principle of fracture mechanics was identified and used successfully to eliminate the significant errors which is very significant for both academic research and engineering applications.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"316 ","pages":"Article 110882"},"PeriodicalIF":4.7,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379348","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}