Engineering Fracture Mechanics最新文献

{"title":"A shear-based breakdown model for the hydraulic fracturing of hot dry rock","authors":"Xiao Ma ,&nbsp;Dawei Hu ,&nbsp;Dongdong Ma ,&nbsp;Yinlin Ji ,&nbsp;Arno Zang ,&nbsp;Haizhu Wang ,&nbsp;Yuangang Ma ,&nbsp;Hui Zhou","doi":"10.1016/j.engfracmech.2025.111070","DOIUrl":"10.1016/j.engfracmech.2025.111070","url":null,"abstract":"<div><div>Hydraulic fracturing is currently an indispensable technique for enhancing reservoir permeability in hot dry rock (HDR). However, the fracture mechanisms of rocks under in situ high-temperature (up to 300 °C) and true triaxial stress conditions are poorly understood. In this work, a series of hydraulic fracturing experiments were performed on granite samples under high temperatures and true triaxial stress states. We found that the breakdown pressure of granite decreased with increasing temperature. The fracture mechanism transitioned from toughness-dominated to viscosity-dominated when the temperature increased to 200 °C. The diffusion of pore pressure into thermally induced microfractures at elevated temperatures resulted in a reduction in the effective stress surrounding the borehole. Tensile-shear failure, rather than pure tensile failure, was observed under conditions of high three-dimensional stress and elevated temperatures, which was attributed to an increase in the effective major principal stress. Accordingly, two shear-based breakdown models were derived on the basis of the stress field around the pressurized borehole under in situ geothermal conditions, which better fit the experimental data under in situ geothermal conditions than other breakdown models do. The experimental and theoretical analyses confirmed that three-dimensional stress and high-temperature effects are critical for hydraulic fracturing initiation under in situ geothermal conditions.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111070"},"PeriodicalIF":4.7,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725206","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":"Experiments and discrete element simulations on the influence of symmetrical forms of joints on the propagation of blasting cracks","authors":"Yang Shen ,&nbsp;Baiquan Lin ,&nbsp;Minghua Lin ,&nbsp;Ting Liu ,&nbsp;Xiangliang Zhang ,&nbsp;Wei Yang ,&nbsp;Chao Zhang","doi":"10.1016/j.engfracmech.2025.111072","DOIUrl":"10.1016/j.engfracmech.2025.111072","url":null,"abstract":"<div><div>Natural joints and cracks in rocks seriously threaten the stability of blasting operations. To investigate how symmetrical forms of joints affect the propagation of blasting cracks, blasting loading tests were performed on red sandstone specimens with three types of prefabricated joints using electronic detonators, and the propagation speed of blasting cracks on the specimen surface was monitored with the aid of crack propagation gauges (CPGs). Based on the mechanical parameters determined from laboratory experiments and the derived blasting stress time history curves, a blasting model of jointed rock mass was established using PFC 2D. With this model, the crack propagation behavior at the microscopic scale and the evolution process of blasting stress waves in symmetrical forms of joints was discussed. The following key conclusions were drawn: (1) Blasting cracks exhibit different propagation morphologies in rock specimens which bear various types of prefabricated joints. Under the arrangement of Type Ⅲ prefabricated joints (the joint spacing gradually narrows), only Crack <em>a</em> (blasting cracks propagating along the main joints) that propagates in the main crack direction appears. Under the arrangement of Type I (parallel joints) and Type II (the joint spacing gradually broadens) prefabricated joints, the propagation of Crack <em>a</em> is significantly suppressed, and the overall distribution of blasting cracks is more complex. (2) The propagation speeds of Crack <em>a</em> were calculated on the basis of the voltage signals of CPGs. The calculation results reveal that the propagation speeds of Crack <em>a</em> in three types of prefabricated joints follow the order: III &gt; I &gt; II. Besides, the propagation length and spacing of Crack <em>a</em> are barely influenced by the joint spacing under Type II, while they are greatly swayed by the joint spacing under Types I and III. (3) The tangential stress under blasting load was extracted in the numerical simulation, and it is found that the tangential stress in Specimens Ⅰ and Ⅱ is small, and it is highly sensitive to the blasting stress wave reflected by the prefabricated joints. A comparison of the stress states of symmetrical joints in Specimens I and II indicates that when the incident wave propagates in the same direction towards the inner side of the joints, the symmetrical joints in Specimens II experience a greater shear force than those in Specimens I, resulting in a lower normal stress and a higher degree of crack development in the joint direction in Specimens II.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111072"},"PeriodicalIF":4.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738117","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":"Rapid energy-efficient manufacturing of high-performance glass fiber reinforced polymer composites via infrared radiation","authors":"Qikuan Cheng ,&nbsp;Yi Yuan ,&nbsp;Haotian Sun,&nbsp;Pengyu Gu,&nbsp;Dong Wang,&nbsp;Lu Zhang,&nbsp;Weibang Xia,&nbsp;Yunming Wang,&nbsp;Huamin Zhou","doi":"10.1016/j.engfracmech.2025.111063","DOIUrl":"10.1016/j.engfracmech.2025.111063","url":null,"abstract":"<div><div>Designing a highly efficient out-of-oven curing scheme is crucial for overcoming the challenges of reducing curing time, minimizing energy consumption, and lowering costs in composite manufacturing. Utilizing a self-developed high-emissivity flexible infrared radiation heater based on polyimide (PI) film, the proposed system delivers uniform heating across the composite. The infrared radiation curing (IRC) scheme is specifically applied to glass fiber reinforced polymer (GFRP) composites and has demonstrated improvements over traditional curing schemes. The uniform heating provided by infrared radiation enhances the internal structural integrity of the material and strengthens the interfacial bonding between the glass fibers and the resin. Compared to room temperature curing (RTC), the IRC scheme shortened the curing time by 91 % while enhancing mechanical properties, with a 14.7 % increase in interlaminar shear strength (ILSS) and a 7.8 % improvement in flexural strength. When compared to oven heating curing (OHC), ILSS and flexural strength improved by 14.2 % and 4.9 %, respectively, with the energy consumption reduced to one-third of that required for OHC. Furthermore, the flexible design of the infrared radiation heater successfully cures thick panels and curved composite components, making it suitable for large sizes and complex geometries. The results highlight the broad potential of IRC in wind energy, aerospace, and transportation industries, offering a practical and scalable solution for advanced composite manufacturing.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111063"},"PeriodicalIF":4.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706294","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":"Fracture characterization of ductile polymer cellular model structures manufactured by FDM","authors":"Jacopo Agnelli ,&nbsp;Claudia Pagano ,&nbsp;Irene Fassi ,&nbsp;Luca D’Andrea ,&nbsp;Pasquale Vena ,&nbsp;Laura Treccani ,&nbsp;Fabio Bignotti ,&nbsp;Francesco Baldi","doi":"10.1016/j.engfracmech.2025.111011","DOIUrl":"10.1016/j.engfracmech.2025.111011","url":null,"abstract":"<div><div>This work addresses specific fundamental and methodological issues regarding the applicability of Fracture Mechanics (FM) testing schemes to polymer open-celled cellular solids with controlled architecture, exhibiting an elastic–plastic response and with pronounced structural heterogeneity at the cell-scale. Acrylonitrile-Butadiene-Styrene (ABS) model structures were manufactured by Fused Deposition Modeling (FDM), and their mode-I fracture response investigated. Structures with different porosity degrees (from <span><math><mrow><mo>≈</mo><mn>20</mn><mtext>%</mtext></mrow></math></span> to <span><math><mrow><mo>≈</mo><mn>70</mn><mtext>%</mtext></mrow></math></span>) were examined, and initiation fracture toughness (J-integral) data determined. Different modes of mechanical macro-confinement experienced by the circular cross-section beam-like structural element were noticed, able to drive a transition from true cellular to solid containing isolated pores.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111011"},"PeriodicalIF":4.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738302","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":"Research on Short-Term prediction precursors of Bedding-Layered sandstone based on strain monitoring","authors":"Zhiqiang Yi ,&nbsp;Yueping Yin ,&nbsp;Shouding Li ,&nbsp;Wenpei Wang ,&nbsp;Mingzhi Zhang ,&nbsp;Tianqiao Mao ,&nbsp;Yixiang Zhang ,&nbsp;Xuebing Wang ,&nbsp;Shaohua Gao","doi":"10.1016/j.engfracmech.2025.111071","DOIUrl":"10.1016/j.engfracmech.2025.111071","url":null,"abstract":"<div><div>This study focuses on short-term prediction precursors for the failure of bedding-layered sandstone. By employing various monitoring techniques, including a testing machine, visible light and thermal infrared cameras, acoustic emission (AE) sensors, and strain gauges. The results indicate that the failure process of bedding-layered sandstone followed a type II rock failure mode, with the main rupture surface forming along bedding planes and releasing frictional heat energy and AE signals. The significant precursors for the failure of bedding-layered sandstone appeared during periods of slow lateral strain increase, with an advanced prediction failure time of 225 s during the stable stage in this study. The findings are valuable for improving predictive capabilities in rock mass system issues, especially for the advance prediction of failure time in high and steep dangerous rocks with well-developed bedding planes.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111071"},"PeriodicalIF":4.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715803","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":"Investigation on the method to estimate fracture properties of semi-elliptical surface cracked plate under three-point bending","authors":"Wenjing Ding,&nbsp;Kaikai Du,&nbsp;Chen Bao","doi":"10.1016/j.engfracmech.2025.111062","DOIUrl":"10.1016/j.engfracmech.2025.111062","url":null,"abstract":"<div><div>This study develops the model of load–displacement relationship for a semi-elliptical surface cracked plate under three-point bending, based on the principle of equivalent energy density in elastoplastic conditions. Semi-analytical expressions of the equivalent stress intensity factor (SIF) <em>K</em>_Ⅰ and the equivalent <em>J</em>-integral are subsequently derived. The parameters of the load–displacement model are calibrated by elastoplastic finite element analysis, and the accuracy and applicability are validated. This work investigates the distributions of <em>K</em>_Ⅰ and <em>J</em>-integral along the front of surface cracks. The distribution functions of <em>K</em>_Ⅰ and <em>J</em>-integral are established, accounting for the effects of ellipse ratio <em>a</em>/<em>c</em>, relative depth <em>a</em>/<em>t</em>, and parametric angle <em>ϕ</em>. Additionally, this work proposes a compliance method for measuring instantaneous crack propagation. Based on these findings, the methods for evaluating the fatigue crack growth rate and quasi-static ductile fracture of semi-elliptical surface cracked plate under three-point bending are developed. By using A508-Ⅲ pressure vessel steel, fatigue crack growth and quasi-static fracture tests are conducted on the plates with varying surface crack geometries and dimensions. The results reveal that the crack growth rate is lowest at the deepest point of the surface crack and highest at the surface point. Compared to through cracks, surface crack exhibits slower fatigue growth rates, with significant differences in the Paris model parameters. The results of quasi-static fracture tests demonstrate that the <em>J</em>-resistance curve is highly sensitive to the surface crack morphology and is lower for surface cracked specimens compared to through cracked specimens.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111062"},"PeriodicalIF":4.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715877","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":"Investigation on dynamic anisotropy of bedded shale under SHPB impact compression","authors":"Xianhui Feng ,&nbsp;Bin Gong ,&nbsp;Xiaofeng Cheng ,&nbsp;Xu Chen ,&nbsp;Xun Xi ,&nbsp;Kaikai Wang","doi":"10.1016/j.engfracmech.2025.111075","DOIUrl":"10.1016/j.engfracmech.2025.111075","url":null,"abstract":"<div><div>Revealing the fracture characteristics of shales under impact is significant for the exploitation and utilization of geological energy. In this study, the progressive failure process of bedded shale was tested by the dynamic Split Hopkinson Pressure Bar system and measured by the high-speed camera. Furthermore, their dynamic mechanical properties and fracture features under impact compression were comprehensively investigated. The results show that according to the triggering mechanisms of micro-cracks and mechanical factors governing fracture morphology, the failure patterns of shales can be categorized into five types: splitting failure along bedding plane, slip failure along bedding plane, mixed shear cracks between layers, tensile-shear mixed cracks, and tensile crack along bedding plane. Meanwhile, when the bedding angle <em>θ</em> = 0°, the sample experiences splitting failure, with acoustic emissions concentrated predominantly at horizontal bedding planes. When <em>θ</em> = 30° and 60°, the sample experiences shear failure characterized by shear cracks, mixed shear cracks and multiple composite tensile-shear cracks. When <em>θ</em> = 90°, the sample exhibits tensile and splitting cracks. With increasing strain rate, the fracture pattern of the 60° sample becomes dominated by slip and tensile-shear mixed cracks. With increasing peak stress intensity, the fracture modes of the 30° and 60° samples gradually transition from center-oriented failure towards shear failure along bedding planes. Additionally, for the 90° specimen, as the shock wave intensifies, secondary splitting cracks emerge in matrix, indicative of a fracture pattern across bedding planes.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111075"},"PeriodicalIF":4.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761068","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":"Experimental investigation and mechanistic analysis of temperature-dependent fractures and failure of lithium-ion battery under indentation loads","authors":"Mingzhe Zhou ,&nbsp;Heguang Wei ,&nbsp;Lingling Hu ,&nbsp;Jinyu Yan ,&nbsp;Minghui Fu","doi":"10.1016/j.engfracmech.2025.111064","DOIUrl":"10.1016/j.engfracmech.2025.111064","url":null,"abstract":"<div><div>Lithium-ion batteries (LIBs) are widely used in electric vehicles and energy storage systems, yet their mechanical and electrochemical behaviors under mechanical abuse remain insufficiently understood, particularly at different ambient temperatures. This study investigates the temperature-dependent responses of commercially available pouch LIBs subjected to indentation loads. Mechanical tests were conducted under continuous and interrupted loading conditions across a wide temperature range, from −30 °C to 70 °C, simulating both normal and extreme operating environments. The results reveal distinct failure patterns: at low temperatures, premature electrical failure occurs due to localized separator damage, while higher temperatures lead to synchronized internal short circuit initiation and catastrophic structural failure. Consequently, the electrical failure threshold exhibits an initial rise followed by a decline as the temperature increases. Post-mortem analysis identifies a progressive failure process at sub-zero temperatures, ranging from microcracks and localized separator fractures to catastrophic failures, depending on the timing of loading termination. Correlations between electrical performance and mesoscopic structural deformation are discussed, highlighting that batteries at lower temperatures are prone to performance degradation even without electrical failure. These findings provide valuable insights for temperature-specific safety assessments of LIBs.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111064"},"PeriodicalIF":4.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704543","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":"Improving the fatigue life of thin plates with small-spacing adjacent double holes with electromagnetic process","authors":"Lixia Ouyang ,&nbsp;Xiang Chen ,&nbsp;Qi Zhao ,&nbsp;Chun Zhang ,&nbsp;Jinfeng Wang ,&nbsp;Xiaofei Xu ,&nbsp;Huihui Geng ,&nbsp;Shaowei Ouyang ,&nbsp;Changxing Li","doi":"10.1016/j.engfracmech.2025.111056","DOIUrl":"10.1016/j.engfracmech.2025.111056","url":null,"abstract":"<div><div>The fatigue life of thin plates with small-spacing adjacent double holes processed using the electromagnetic cold expansion method was investigated with employing both numerical and experimental approaches. The results indicated that radial tensile stress is generated during electromagnetic processing, effectively preventing warping during the strengthening of thin plates. Importantly, uniformly distributed tangential compressive residual stress along the thickness direction near the holes was produced after the electromagnetic method. This distribution effectively mitigates the accumulation of crack sources in areas of low residual compressive stress under fatigue load. Furthermore, the depth of the compressive stress area in the radial direction was found to be 4–5 times greater than that achieved by conventional cold expansion methods. Fatigue testing further demonstrated the superior performance of the electromagnetic method, revealing a more than tenfold increase in fatigue life under an external load of <em>σ</em>_max = 100 MPa.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111056"},"PeriodicalIF":4.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716270","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 efficient explicit–implicit adaptive method for peridynamic modeling of quasi-static fracture formation and evolution","authors":"Shiwei Hu ,&nbsp;Tianbai Xiao ,&nbsp;Mingshuo Han ,&nbsp;Zuoxu Li ,&nbsp;Erkan Oterkus ,&nbsp;Selda Oterkus ,&nbsp;Yonghao Zhang","doi":"10.1016/j.engfracmech.2025.111046","DOIUrl":"10.1016/j.engfracmech.2025.111046","url":null,"abstract":"<div><div>Understanding the quasi-static fracture formation and evolution is essential for assessing the mechanical properties and structural load-bearing capacity of materials. Peridynamics (PD) provides an effective computational method to depict fracture mechanics. The explicit adaptive dynamic relaxation (ADR) method and the implicit methods are two mainstream PD approaches to simulate evolution of quasi-static fractures. However, no comprehensive and quantitative studies have been reported to compare their accuracy and efficiency. In this work, we first develop an implicit method for bond-based peridynamics (BBPD) based on the full nonlinear equilibrium equation and the degenerate form of the bond failure function, where the Jacobian matrices are derived using the Newton–Raphson (NR) scheme. Subsequently, we analyze the solvability of the implicit BBPD scheme. Second, a consistent and comprehensive comparison of accuracy and efficiency of the explicit ADR and implicit methods is conducted, which reveals computational efficiency of the implicit methods and their limitations in accurately describing crack formation. Finally, by utilizing the unique advantage of both methods, we develop an adaptive explicit–implicit method and propose a switching criterion to deploy appropriate scheme accordingly. Four typical quasi-static problems are employed as the numerical experiments, which show the acceleration ratios of the current method range from 6.4 to 141.7 when compared to the explicit ADR. Therefore, the explicit–implicit adaptive method provides a powerful method to simulate quasi-static fracture formation and evolution.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111046"},"PeriodicalIF":4.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715802","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}