Engineering Fracture Mechanics最新文献

{"title":"Fatigue characteristics of high-strength aluminum alloy with and without surface mechanical rolling treatment in the transition regime between high cycle and very-high cycle fatigue","authors":"Zepeng Liu,&nbsp;Jialong Li,&nbsp;Li Zhang","doi":"10.1016/j.engfracmech.2025.111585","DOIUrl":"10.1016/j.engfracmech.2025.111585","url":null,"abstract":"<div><div>In the present work, the <em>S-N</em> curve and failure mode characteristics of 7075-T651 high-strength aluminum alloy specimens with and without surface mechanical rolling treatment (SMRT) was investigated under uniaxial symmetric fatigue tests (<em>R</em> = -1) at room temperature. The research results showed that the <em>S-N</em> curve of Al alloy specimens treated by SMRT presented smooth and continuous characteristics, and three fatigue failure modes of S-mode (surface failure), Int-mode (internal failure without FGA) and IFGA-mode (internal failure with FGA) were discovered depending on applied stress amplitude level. The original 7075-T651 specimens contained two failure modes of S-mode and IFGA-mode, and the <em>S-N</em> curve showed a step-wise characteristic. The reasons for the transition of the failure mode in transition regime between high cycle (HCF) and very-high cycle fatigue (VHCF) was researched based on the stress intensity factor range (Δ<em>K</em>). Furthermore, Paris-Hertzberg law was used to calculate the fatigue crack growth life of different failure modes.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111585"},"PeriodicalIF":5.3,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227382","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":"Temperature-dependent fracture characterization of methacrylate adhesive-bonded glass fibre-reinforced reactive thermoplastic composites","authors":"Milos Zivkovic ,&nbsp;Erli Shi ,&nbsp;Wilfried V. Liebig ,&nbsp;John Montesano","doi":"10.1016/j.engfracmech.2025.111584","DOIUrl":"10.1016/j.engfracmech.2025.111584","url":null,"abstract":"<div><div>The Mode I and Mode II fracture behaviour of glass fibre-reinforced reactive thermoplastics bonded with a methyl methacrylate adhesive was characterized under room temperature (RT) and low temperature (LT; –40 °C) conditions via double cantilever beam (DCB) and end-notch flexural (ENF) tests at varying bond-line thicknesses. RT-DCB specimens exhibited a higher peak force, lower elastic stiffness, and higher initiation fracture toughness (77 % increase for thickest bond line) compared to LT-DCB specimens. Mode I initiation fracture toughness was insensitive to bond-line thickness at RT but decreased with increasing bond-line thickness at LT. RT-DCB specimens exhibited stable ductile cohesive failure. Conversely, LT-DCB specimens exhibited unstable oscillatory crack propagation between the substrates which was influenced by the substrate microstructure and caused by thermally-induced residual stresses in the adhesive layer. RT-ENF specimens exhibited higher peak force and a positive correlation with bond-line thickness, while LT-ENF specimens showed a negative correlation with bond-line thickness. All RT-ENF specimens were characterized by ductile cohesive fracture with consistent hackle formations, while LT-ENF specimens experienced brittle failure within the substrate characterized by fibre pullout and shear cusps between fibres. The fracture characterization results presented can contribute to optimizing the damage tolerance of corresponding adhesive-bonded components.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111584"},"PeriodicalIF":5.3,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227383","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 the instability of early age 3D printing cement-based structure– considering the influence of interface","authors":"Renlong Liu ,&nbsp;Jiyu Tang ,&nbsp;Hu Feng ,&nbsp;Zhanqi Cheng","doi":"10.1016/j.engfracmech.2025.111565","DOIUrl":"10.1016/j.engfracmech.2025.111565","url":null,"abstract":"<div><div>Early collapse poses a significant challenge in the realm of three-dimensional printing concrete (3DPC) processes. Concurrently, the interface assumes a pivotal role in influencing the structural performance of 3DPC. However, the influence of the interface is seldom considered in detail in early collapse predictions. To address this issue, a novel 3D printing cement-based structure model that incorporates the influence of interface performance is proposed by introducing the concept of an equivalent interface. The computational model was constructed using the peridynamics (PD) method, incorporating parameter corrections for specific bonds to account for interface effects. The results demonstrated that, compared with the exaggerated failure height of cylinder structures simulated in most similar studies, the model with equivalent interface effectively reduced the number of failure layers and the simulation results were closer to the experimental results. Furthermore, we conduct a thorough investigation into the impact of different degrees of interface performance attenuation on the failure height of cylindrical structures, offering comprehensive insights into the underlying mechanisms. These findings contribute to addressing the pressing issue of early collapse in 3DPC processes and offer valuable implications for accurately predicting the failure height of printed concrete components.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111565"},"PeriodicalIF":5.3,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227385","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":"Characterization of Mode I fracture mechanics properties of extruded polystyrene via double cantilever beam test using a side-grooved sample","authors":"Yushi Kumagai,&nbsp;Hiroshi Yoshihara","doi":"10.1016/j.engfracmech.2025.111578","DOIUrl":"10.1016/j.engfracmech.2025.111578","url":null,"abstract":"<div><div>Double cantilever beam (DCB) test is mathematically well defined and can provide a Mode I strain energy release rate based on energy considerations. Additionally, it enables consecutive measurements of the Mode I fracture mechanics properties during crack growth. Despite these advantages, it is difficult to find any examples performing the DCB test on extruded polystyrene (XPS), and knowledge on the fracture mechanics properties of XPS is quite restricted. In this study, DCB test is conducted using an XPS sample with side grooves on width/length or thickness/length planes, and the Mode I fracture mechanics properties are characterized during crack growth. In addition to the DCB test, four-point single-edge-notched bending (4SENB) tests were performed, and the results were compared with those obtained from the DCB tests. In the DCB test, the cracks grew unstably and stopped growing after a certain length in both the samples. In the sample with grooves on the width/length planes, the cracks propagated toward the end of the sample. However, in the sample with grooves on the thickness/length planes, the bending failure is induced before the crack propagated considerably. The Mode I fracture mechanics properties obtained using the samples with grooves on the thickness/length planes are two to three times greater than those obtained using the samples with on the width/length planes, and the increase in Mode I energy release rate during crack growth is more significant. Additionally, the statistical analysis suggests that there was no significant difference between the results obtained from the DCB and 4SENB tests.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"329 ","pages":"Article 111578"},"PeriodicalIF":5.3,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145183719","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":"Stress singularities in soft materials of harmonic type interacting with a rigid wedge","authors":"Kui Miao,&nbsp;Qiang Zhang,&nbsp;Ming Dai,&nbsp;Cun-Fa Gao","doi":"10.1016/j.engfracmech.2025.111576","DOIUrl":"10.1016/j.engfracmech.2025.111576","url":null,"abstract":"<div><div>Composite structures of rigid wedges embedded in soft elastic materials are prevalent in biomedical devices, soft robotics, and flexible electronics. Due to significant mismatches in the elastic moduli between soft materials and rigid wedges, severe stress concentrations may occur in the vicinity of the wedge corner, which may further lead to certain structural failure such as rupture of the soft matrices. The interactions between soft matrices and rigid wedges have been widely studied in the literature but mainly in the context of linear elasticity and small deformation assumptions. Relevant studies about rigid wedges embedded in soft materials exhibiting geometric and constitutive nonlinearities are extremely limited and it remains unclear whether the equations and conclusions in linear elasticity are still applicable. In this paper, we present an asymptotic analysis of the local elastostatic field for the case of a rigid wedge perfectly bonded to a soft rubber-like matrix which is modelled as a hyperelastic material of harmonic type under large deformations. The asymptotic results demonstrate that the singularity behavior of the local stress and deformation gradient near the wedge corner depend solely on the angle of the wedge (which is in sharp contrast to corresponding linear elasticity-based results). In addition, we show that asymptotic singular solutions for the current hyperelastic case are conditional on the angle of the wedge (they exist only for a specific range of the angle of the wedge), indicating that severe volumetric distortion may occur in the vicinity of the wedge corner for certain acute angles of the wedge (which fails to be captured with the use of linear elasticity theory).</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111576"},"PeriodicalIF":5.3,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227381","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 effects of real-time high temperature and circulating liquid nitrogen cooling on the granite Brazilian splitting test specimens","authors":"Fangchao Zhou ,&nbsp;Guoying Wang ,&nbsp;Housheng Jia ,&nbsp;Gan Feng ,&nbsp;Lei Wang ,&nbsp;Norbert Klitzsch ,&nbsp;Chuanliang Yan ,&nbsp;Shaowei Liu ,&nbsp;Zhazha Hu ,&nbsp;Shuai Heng ,&nbsp;Yihe Yu ,&nbsp;Wen Wang","doi":"10.1016/j.engfracmech.2025.111574","DOIUrl":"10.1016/j.engfracmech.2025.111574","url":null,"abstract":"<div><div>After liquid nitrogen (LN₂) fracturing stimulates the hot dry rock reservoir, thermal conduction from the surrounding rock gradually restores the fractured reservoir to high temperatures. The mechanical behavior of the reservoir under real-time high temperature conditions following LN₂ cooling cycles significantly influences the development of fracture networks and wellbore stability. Therefore, in this paper, investigating the effects of real-time high temperature and circulating LN₂ cooling on the granite Brazilian splitting test specimens. Results indicate that the real-time high temperature conditions further reduce the bond stress between the minerals, reduces the brittle-ductile transition threshold to 500℃ (600℃ at room temperature). Under the same LN₂ cooling cycles, tensile strength at real-time high temperature was lower than that at room temperature (except at 100℃). Compared with room temperature conditions, the tensile strength at 100℃ increased by 6.91%, while the tensile strength at 200℃, 300℃, 400℃, 500℃ and 600℃ decreased by 7.83%, 10.67%, 29.93%, 25.91% and 4.84%, respectively. In addition, compared with room temperature, the cross-section roughness at 500℃ and 600℃ increased by 7.29% and 14.66%, respectively, and Z₂ increased by 8.87% and 18.79%, respectively, under real-time high temperature conditions, and the acoustic emission signal was more active during the loading process, which indicated that real-time high temperature conditions promoted the initiation and propagation of microcracks. Microstructural analysis suggests that quartz α-β phase transition (573℃) and thermal expansion mismatches are key factors in thermal damage. These findings provide insights into the stability assessment of Enhanced Geothermal System reservoirs.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111574"},"PeriodicalIF":5.3,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155282","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":"Fractal-order nonlinear damage creep model of rocks based on equivalent viscoelasticity","authors":"Wenbo Liu ,&nbsp;Shuguang Zhang ,&nbsp;Xiang Huang ,&nbsp;Shutian Zhao ,&nbsp;Dipeng Zhu ,&nbsp;Wenwu Ou ,&nbsp;Jiaming Li","doi":"10.1016/j.engfracmech.2025.111568","DOIUrl":"10.1016/j.engfracmech.2025.111568","url":null,"abstract":"<div><div>The importance of relaxation time in the evolution of rock rheological viscoelasticity is highlighted based on the equivalent viscoelasticity between the fractal order Zener model and the time-varying viscosity Zener model. The damage factor related to relaxation time is established, and the physical meaning of the damage factor in the process of rock rheological deformation is explained. The fractal-order variable-order function is established using relaxation time. On this basis, a variable-order fractal-order damage creep model is constructed, and the model is extended to the 3D stress state. A variable-order fractal damage creep model under 3D stress state is given. Finally, the applicability and rationality of the damage creep model under triaxial state are verified based on the triaxial creep test data of sandstone. Results show that the experimental data exhibit good agreement with the model fitting curve, providing a better description of the mechanical behavior of the entire creep process. The validity of the model fitting parameters is analyzed and verified, increasing the applicability of the model in other complex stress environments.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111568"},"PeriodicalIF":5.3,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155279","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 critical evaluation of shear specimen geometry for accurate stress triaxiality control","authors":"Mohd Firoz Alam ,&nbsp;Vikram Balaji ,&nbsp;Fausto Tucci ,&nbsp;Hariharan Krishnaswamy ,&nbsp;Uday Chakkingal","doi":"10.1016/j.engfracmech.2025.111562","DOIUrl":"10.1016/j.engfracmech.2025.111562","url":null,"abstract":"<div><div>The forming limit in many non-conventional forming applications is increasingly modelled using continuum damage models. The ductile fracture under proportional loading is dependent upon the deformation stress state. Accurate characterisation of specific stress paths is essential for the development and calibration of reliable damage models in metal forming. Among these, achieving and maintaining a pure shear stress state remains particularly challenging due to the constraints posed by the geometric design and experimental loading. This study presents a novel, robust and systematic framework for evaluating and comparing a range of shear specimen geometries for a high strength steel based on the evolution of stress triaxiality and strain localisation behaviour, through finite element method. It further examines the formation and progressive rotation of shear bands during deformation — an aspect that has received limited attention in existing literature. With the exception of the eccentric notch shear (ENS) specimen, none of the geometries were found to be effective in achieving a pure shear state for the chosen material properties. However, the ENS specimen exhibited further limitations when applied to a high-strength dual-phase steel, including compressive-to-tensile triaxiality transitions and inclined fracture paths. Based on these insights, a novel Half V-Notch shear specimen is proposed. The new geometry achieves a near-zero average stress triaxiality, eliminates compressive triaxiality transitions, and maintains fracture plane alignment parallel to the loading axis, preventing any in-plane rotation. Experimental validation using DP1180 steel further confirmed the specimen’s suitability for accurately calibrating shear-sensitive fracture models.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111562"},"PeriodicalIF":5.3,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic mechanical behavior and failure evolution of water-bearing grotto sandstone under cyclic loading and unloading","authors":"Shuo Wang ,&nbsp;Wengang Zhang ,&nbsp;Yanmei Zhang ,&nbsp;Sicheng Lin ,&nbsp;Weixin Sun ,&nbsp;Siwei Jiang ,&nbsp;Zihua Xiong ,&nbsp;Gang Zhao","doi":"10.1016/j.engfracmech.2025.111573","DOIUrl":"10.1016/j.engfracmech.2025.111573","url":null,"abstract":"<div><div>To further investigate the dynamic mechanical behavior and failure evolution of grotto sandstone in water-rich environments, a series of uniaxial cyclic loading and unloading tests were conducted on water-bearing grotto sandstone, with simultaneous acoustic emission (AE) signal monitoring. The results show that a critical water content range of 2.63–3.93 % was identified, within which significant shifts occur in both the hysteresis curve and the fatigue characteristics of sandstone. The proportion of shear and tensile cracks gradually transfers from a low-frequency ordered zone to a high-frequency disordered zone, with a critical transition point occurring at an axial stress of <em>σ</em>₁ = 12 MPa and a cycle number <em>N</em> = 4. Total energy, dissipated energy, and elastic energy demonstrate exponential growth as the number of cycles increases. With increasing water content, the rate of dissipated energy increases, leading to a more significant rise in irreversible damage. The evolution of the correlation dimension of water-bearing sandstone during fatigue failure follows three stages: initial decrease stage, stable change stage, and gradual increase stage. Based on the evolution of the correlation dimension of AE absolute energy, the instability precursor information for the water-bearing sandstone can be determined. The weakening effect of water reduces the instability time of grotto sandstone under cyclic loading. This research holds significant implications for prediction of rock failure in grotto heritage of rock masses.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111573"},"PeriodicalIF":5.3,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155278","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":"Revealing microstructural crack deflection for EH36 steel and predicting fatigue growth of part-through curve cracks","authors":"Yuxiang Zhao,&nbsp;Peishi Yu,&nbsp;Lei Yao,&nbsp;Yin Tao,&nbsp;Xin Zhang,&nbsp;Junhua Zhao","doi":"10.1016/j.engfracmech.2025.111572","DOIUrl":"10.1016/j.engfracmech.2025.111572","url":null,"abstract":"<div><div>EH36 steel is widely used in marine structures, where accurate fatigue life prediction is essential. In this study, fatigue crack growth behavior was investigated through experiments and simulations on straight-through cracks with varying thicknesses and stress ratios. A three-dimensional crack growth model was developed, yielding fatigue parameters independent of geometry and loading, and showing strong agreement with experimental results. During validation, near-surface crack deflection was consistently observed in straight cracks. Further microstructural analysis using white light interferometry, SEM, and metallography revealed that grain orientation and inclusions drive the deviation of the crack path by altering local stress intensity and crack tip shape. To evaluate the model’s transferability, fatigue tests and simulations on part-through curved cracks were performed. The model accurately predicted both crack growth rates and paths. This work establishes a unified predictive framework for fatigue crack growth in EH36 steel, supported by microstructural understanding and applicable to complex crack geometries in marine engineering.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111572"},"PeriodicalIF":5.3,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118182","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}