Engineering Fracture Mechanics最新文献

{"title":"A study of Johnson-Cook model coefficient corrections in the cryogenic machining of Ti-5AL-2.5Sn alloy","authors":"Haibo Liu ,&nbsp;Yang Wang ,&nbsp;Jianming Li ,&nbsp;Yishun Cheng ,&nbsp;Daomian Sun ,&nbsp;Shaowei Jiang ,&nbsp;Lingsheng Han ,&nbsp;Yongqing Wang","doi":"10.1016/j.engfracmech.2025.111114","DOIUrl":"10.1016/j.engfracmech.2025.111114","url":null,"abstract":"<div><div>The accuracy of constitutive models directly affects the simulation and analytical calculations of material cutting. Currently, most constitutive models primarily focus on the high-temperature dynamic mechanical behavior of materials, while research on low-temperature dynamic mechanical properties is relatively limited. Therefore, this study targets the Ti-5Al-2.5Sn alloy and employs an electronic universal testing machine and a split Hopkinson pressure bar to conduct static and dynamic compression tests within a temperature range of −196 °C to 600 °C. Furthermore, we constructed a Johnson-Cook constitutive model that accounts for low-temperature dynamic performance using the mechanical curves obtained. To validate the accuracy of the model, we selected cryogenic cutting as the application scenario and employed a combination of experimental and simulation methods to verify the newly developed model. The results indicate that as the temperature decreases or the strain rate increases, the material exhibits a significant strengthening effect along with grain refinement. The newly fitted constitutive model addresses the shortcomings of traditional models in adapting to low-temperature mechanical properties. In the validation of cutting forces during cryogenic cutting, the model’s error is controlled within 15%. This research provides theoretical guidance for cryogenic machining processes and the design of low-temperature structures.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111114"},"PeriodicalIF":4.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829730","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 analytical method for determining J-integral-crack opening displacement curve of DCB specimen with large scale fiber bridging","authors":"Dingli Tian ,&nbsp;Yu Gong ,&nbsp;Zhaobin Li ,&nbsp;Luohuan Zou ,&nbsp;Jianyu Zhang ,&nbsp;Libin Zhao ,&nbsp;Ning Hu","doi":"10.1016/j.engfracmech.2025.111121","DOIUrl":"10.1016/j.engfracmech.2025.111121","url":null,"abstract":"<div><div>The fiber bridging is an important toughening mechanism, and <em>J</em>-integral theory is usually used to determine the bridging stress. To achieve the determination of bridging stress, the calculation of <em>J</em>-integral-crack opening displacement <em>J</em>(<em>δ</em>) curve is the key. A new analytical method is proposed to calculate the <em>J</em>(<em>δ</em>) curve, which only requires the experimentally recorded load–displacement data. Compared with the traditional analytical method based on equivalent crack length, the proposed method has more physical significance. Two independent parameters, i.e. initial fracture toughness <em>J_init</em> and the crack opening displacement corresponding to initial damage <em>δ</em>₀ can be directly extracted from the calculated <em>J</em>(<em>δ</em>) curve. In addition, the bridging stress with a multi-linear function can be determined. Experimental cases with large scale fiber bridging are used to verify the validity of the analytical method. The proposed method is simple and effective, and can provide support for investigating the fiber bridging phenomenon of mode I delamination.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111121"},"PeriodicalIF":4.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825926","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":"Optimizing the design of the dielectric-loaded converging waveguide antenna for enhanced microwave fracturing of biotite diorite","authors":"Ziqiang Su ,&nbsp;Yanlong Zheng ,&nbsp;Fuxin Rui ,&nbsp;Gaofeng Zhao ,&nbsp;Fei Sun ,&nbsp;Jianchun Li","doi":"10.1016/j.engfracmech.2025.111128","DOIUrl":"10.1016/j.engfracmech.2025.111128","url":null,"abstract":"<div><div>Microwave-assisted rock breakage is a promising technique for improving the performance of mechanical excavators in hard rocks in the construction and mining industries. Open-ended dielectric-loaded converging waveguide antennas (DLCWAs) have been identified as the most suitable antennas for fracturing rocks with a low microwave fracturability index. However, optimizing the design of DLCWAs has been challenging due to limitations in simulating the microwave fracturing process of rocks. In this study, a validated method coupling COMSOL Multiphysics and four-dimensional lattice spring model (4D-LSM) is employed to evaluate the performance of DLCWAs with varying opening sizes and transition section lengths. The numerical results reveal a strong correlation between the temperature and fracturing characteristics. An antenna with an opening size of 70 mm × 40 mm and a transition section length of 16 cm is numerically identified as the optimal design for fracturing a fine-grained biotite diorite. To validate the design, the antenna is manufactured and tested for microwave heating and rock breakage. Experimental results show that the optimized antenna supports high-power microwave heating and fracturing and significantly enhances mechanical rock breakage efficiency compared to the original design. This study provides a framework for optimizing antenna designs and addresses the gap in simulating microwave rock fracturing.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111128"},"PeriodicalIF":4.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829731","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":"Fiber damage mechanisms of SiCf/Ti6242 under fatigue load at elevated temperature","authors":"Xuming Niu,&nbsp;Jingyuan Hu,&nbsp;Lei Pan,&nbsp;Hanmin Xiao,&nbsp;Xubo Yao,&nbsp;Yingdong Song,&nbsp;Zhigang Sun","doi":"10.1016/j.engfracmech.2025.111115","DOIUrl":"10.1016/j.engfracmech.2025.111115","url":null,"abstract":"<div><div>A high-temperature fatigue test was conducted on SiCf/Ti6242 composites, and the specimens’ cross-sections were examined using XCT and SEM. A matrix intrusion phenomenon, likely due to fatigue unloading, was noted near the fracture surface. Fiber fragment lengths, fracture spatial distribution, and fiber orientation were analyzed through a novel digital image processing method. Results show that fibers typically break into smaller pieces than predicted by Curtin’s model, concentrating failures in a fan-shaped area. The discrete fiber element model indicates that local off-axis behavior leads to embedding-type fiber fractures, increasing local overload and reducing the composite’s fatigue life. Improvement suggestions are provided for the simulation model of composites with off-axis fibers, along with new requirements for the stacking process of precursor wire-derived composites.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111115"},"PeriodicalIF":4.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820582","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":"Mechanisms of transverse bowl-shaped crack in all solid-state batteries","authors":"Longfei Yang,&nbsp;Yue Gao,&nbsp;Yuli Chen,&nbsp;Bin Ding","doi":"10.1016/j.engfracmech.2025.111117","DOIUrl":"10.1016/j.engfracmech.2025.111117","url":null,"abstract":"<div><div>The initiation and growth of Li dendrites pose significant challenges to the commercialization of all-solid-state batteries (ASSBs). Dendrite initiation begins with spallation with subsurface pore filling and subsequent bowl-shaped crack propagation toward the Li anode/solid electrolyte (SE) interface. In this study, we investigate the mechanism of transverse bowl-shaped crack initiation and propagation associated with Li dendrite initiation, as dendrite growth is inevitable once initiated. We propose a mechano-electrochemical coupling theoretical model to analyze the stress field around a subsurface pore during Li filling, treating the continuous Li deposition at the pore/SE interface as eigenstrain. Stress concentration at the pore edge, which drives crack initiation when exceeding the local fracture strength, can be alleviated by applying stack pressure or utilizing an SE with a low pore aspect ratio, a large pore depth, high electronic resistance, and low area-specific resistances at electrode/SE interface. Furthermore, bowl-shaped crack propagation is simulated by extended finite element method (XFEM) following the maximum principal stress criterion. The attraction from Li anode/SE interface drives the crack to deflect into a bowl-shaped morphology, which can be suppressed by applying lateral pressure. These findings elucidate the underlying mechanisms of bowl-shaped crack formation related to Li dendrite initiation and provide critical insights for mitigating dendrite-induced degradation in ASSBs.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111117"},"PeriodicalIF":4.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823597","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":"Assessing fracture toughness performance of adhesively bonded carbon fiber/epoxy composite joints accompanied by acoustic emission inspection: Effect of surface treatment methods","authors":"Halil Senol ,&nbsp;Hasan Ulus ,&nbsp;Ceren Yildirim ,&nbsp;Abdulrahman Al-Nadhari ,&nbsp;Serra Topal ,&nbsp;Mehmet Yildiz","doi":"10.1016/j.engfracmech.2025.111119","DOIUrl":"10.1016/j.engfracmech.2025.111119","url":null,"abstract":"<div><div>This study investigates the impact of mechanical abrasion (MA), atmospheric pressure plasma activation (APA), and peel-ply (PP) treatments on the fracture toughness, damage mechanisms and damage progression of adhesively bonded carbon-fiber (CF)/epoxy composite joints. The chemical and physical properties of treatment applied adherend surfaces are examined through various methods. Double cantilever beam (DCB) and end-notched flexure (ENF) tests are conducted to evaluate the fracture toughness of joints. The acoustic emission (AE) method is employed during DCB and ENF tests to evaluate damage mechanisms and damage progression within specimens. The results demonstrate that MA treatment provides the highest fracture toughness, with mode-I (G_IC) and mode-II (G_IIC) toughness values increasing by 59% and 43%, respectively, compared to untreated specimens. APA-treated specimens show improved G_IC and G_IIC values by 27% and 30%, respectively, which is attributed to enhanced surface energy and chemical functionality. PP treatment contributes to a 20% increase in G_IC and a 14% rise in G_IIC due to improved surface roughness and surface energy. The findings highlight that the mechanical interlocking effect induced by MA treatment significantly strengthens the bond, while surface chemistry modifications achieved through APA treatment benefit bonding in applications where material integrity is critical. AE analysis reveals distinct damage mechanisms associated with each surface treatment.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111119"},"PeriodicalIF":4.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825925","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":"Geometry-dependent fracture behavior of glassy polymer films: Insights from mode I and mode III tearing of polyimide films","authors":"Hangyu Fan ,&nbsp;Tao Liu ,&nbsp;Xin Pan ,&nbsp;Jianqiang Deng ,&nbsp;Zhaoxin Yun ,&nbsp;Xiang Gao ,&nbsp;Liming Chen","doi":"10.1016/j.engfracmech.2025.111122","DOIUrl":"10.1016/j.engfracmech.2025.111122","url":null,"abstract":"<div><div>Through in-plane (mode I) and trouser (mode III) tearing experiments conducted on polyimide film, and the Essential Work of Fracture theory, the influence of geometry (film thickness, orientation, geometric ratio, and pre-crack patterns) on the fracture behavior is studied. The result shows that polyimide film displays brittle fracture macroscopically, but presents localized microplasticity on the fracture surface examined by scanning electron microscopy. The fracture behavior of polyimide films exhibits a pronounced geometry-dependence and the ranking of the influencing factors is: thickness &gt; orientation = geometric ratio &gt; pre-crack pattern. The fracture toughness for mode III fractures is only 9 % − 15 % of that for mode I, highlighting mode III as the most critical and hazardous fracture mode for polyimide films.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111122"},"PeriodicalIF":4.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817272","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 mechanism of oblique incident explosion stress wave on directional motion crack","authors":"Zhen Liu ,&nbsp;Renshu Yang ,&nbsp;Jinjing Zuo ,&nbsp;Peng Xu ,&nbsp;Yong Zhao ,&nbsp;Caiyan Zhang ,&nbsp;Huan Yang","doi":"10.1016/j.engfracmech.2025.111124","DOIUrl":"10.1016/j.engfracmech.2025.111124","url":null,"abstract":"<div><div>The interaction between explosion stress waves and cracks in engineering blasting is a complex and critical issue. The mechanism of an obliquely incident explosion stress wave on directional crack motion is intricate, involving extension, deflection, and changes in fracture patterns. The mechanical effects of an obliquely incident explosion stress wave on a crack are examined through theoretical analysis, dynamic caustic experiments, and numerical simulations. The results indicated that the oblique incidence of an explosion stress wave causes significant caustic speckle distortion at the crack tip, with the deformed caustic speckle shape differing distinctly from the circular caustic speckle characteristic of a type I crack. The stress intensity factor and crack growth rate at the crack tip decrease sharply under the compressive stress in the bright region of the explosion stress wave. They rise rapidly under the influence of tensile stress in the dark area. The caustic speckle of Ⅰ+Ⅱ compound cracks is generated at the crack tip by an oblique incident explosion stress wave, and the variation patterns of type I and type II stress intensity factors (K_Ⅰ and K_Ⅱ) are opposite. When the stress wave reaches the crack tip, there is a reduction of 50 %, 69.2 %, and 88.5 % in the minimum peak value of stress intensity factor for specimens S-2, S-3, and S-4 respectively compared to simultaneous initiation. Furthermore, there is a decrease of 23.9 %, 34.8 %, and 47.8 % in the maximum peak value；The minimum peak speed is reduced by 27.5 %, 50 %, 80 %, and the maximum peak speed is reduced by 11.4 %, 17.1 %, 28.6 %. A specific functional relationship exists between the stress wave’s incident angle and the crack’s deflection length. The change of a single variable does not determine the crack propagation length and direction; instead, they are affected by three variables: the incident angle of the stress wave α, σ₁, and σ₂. After the explosive detonation, the compressive stress zone first acts on the crack tip element, resulting in a negative stress field. Then, the tensile stress zone acts on the crack tip element, and the stress field becomes positive. Under the alternating influence of tensile and compressive stress, the stress field exhibits a “positive and negative alternating” pattern and a downward trend. The stress in the x and y directions decreases by 31.8 %, 45.5 %, and 59.1 % and 27.6 %, 40.7 %, and 57.2 % respectively when the explosion-induced stress wave reaches the crack tip, compared to simultaneous initiation. Investigating the mechanism of the oblique incident explosion stress wave on directional motion cracks is beneficial for understanding the interaction between explosion stress waves and cracks and provides a theoretical foundation and technical support for crack control in engineering blasting.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111124"},"PeriodicalIF":4.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808681","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":"Electrode crack evolution and failure mechanism during calendering: Insights from discrete element method-based mesoscopic simulation","authors":"Yuhang Lyu ,&nbsp;Shaohai Dong ,&nbsp;Tao Zhang ,&nbsp;Zhan-Sheng Guo","doi":"10.1016/j.engfracmech.2025.111120","DOIUrl":"10.1016/j.engfracmech.2025.111120","url":null,"abstract":"<div><div>The mechanical failure behavior of electrode structures during calendering or compressive loading in lithium-ion batteries (LIBs) is recognized as a crucial factor affecting their safety performance. To gain better insight into the mesoscopic and microscopic mechanisms of electrode fracture, a two-dimensional mesoscopic model of the electrode, including active materials (AMs), carbon-binder domain (CBD), and pores, is proposed based on the discrete element method. This model is designed to analyze crack initiation, propagation, and eventual fracture caused by CBD failure during calendering by linking the local contact of AMs. The effects of the initial electrode structure, AM particle size, particle size distribution (PSD) and electrode thickness on the mechanical integrity of the electrode are also investigated. The simulated crack morphology is found to be in good agreement with the results of the electrode compression tests. It is observed that a narrower PSD and larger particle size contribute to better mechanical integrity. Increasing electrode thickness reduces mechanical integrity. The developed model enhances our understanding of electrode failure behavior at the mesoscopic level and provides a valuable physical and mechanical basis for optimizing the design of electrode manufacturing processes in LIBs.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111120"},"PeriodicalIF":4.7,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791828","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":"Explosive fragmentation of brittle granular materials","authors":"Chuanshan Zhang ,&nbsp;Chun Feng ,&nbsp;Jun Zhou ,&nbsp;Kun Xue","doi":"10.1016/j.engfracmech.2025.111126","DOIUrl":"10.1016/j.engfracmech.2025.111126","url":null,"abstract":"<div><div>This study experimentally investigates the dynamic fragmentation behaviors of brittle granular materials subjected to explosive loadings, employing a concentric shell configuration. The setup consisted of a high-explosive sphere surrounded by a densely packed shell of dry glass spheres. To minimize reflection enhancement, the particle shells were confined within thin-walled glass casings, effectively simulating air-exposed conditions. This configuration allowed rarefaction waves reflected from the outer surface of the particle shell to significantly influence particle fragmentation, particularly in thinner shells. A specialized fragment-collecting apparatus was designed to prevent collision-induced damage to particle fragments, enabling the recovery of most fragments with preserved post-test morphologies following the explosion tests. A comprehensive analysis was conducted on the breakage extent and pulverization degree of the fragmented brittle particles, utilizing metrics such as breakage index, fragmentation volume fraction, and fractal dimension. These parameters exhibited significant variations as the particle shell thickness increased from a dimension comparable to the explosive radius to several times that radius. Notably, the thinnest particle shell underwent near-total particle crushing, evidenced by a fractal dimension of up to 3.2, indicating intense fractal crushing. When the shell thickness increased to 3.75 times the explosive radius, the fragmentation volume fraction was nearly halved, and the fractal dimension decreased significantly. These variations in fragmentation behaviors highlight the impact of divergent blast waves, which impart transient explosive loadings with rapidly decaying overpressures on the particles. The experimental results elucidate the relationship between explosive fragmentation and transient explosive loadings, providing estimations for the radii of pulverized and fractured spherical zones. Particles fragmented by explosive loadings exhibit a markedly higher fractal dimension compared to those fractured by quasi-static loadings, even when fragmentation volume fractions are similar. This suggests distinct breakage mechanisms between the two loading conditions.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"321 ","pages":"Article 111126"},"PeriodicalIF":4.7,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817271","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}