Theoretical and Applied Fracture Mechanics最新文献

{"title":"Acid-Induced fracture and pore structure evolution in basalt","authors":"Shuxin Liu ,&nbsp;Xiaofei Liu ,&nbsp;Xiaoran Wang ,&nbsp;Qiang Sun ,&nbsp;Jinhua Wang ,&nbsp;Jiaxin Shao ,&nbsp;Joseph F. Labuz","doi":"10.1016/j.tafmec.2025.105200","DOIUrl":"10.1016/j.tafmec.2025.105200","url":null,"abstract":"<div><div>Basalt has emerged as a promising candidate for in-situ mineral carbonation in CCUS applications. Developing fracture and pore networks in basalt formations is crucial for facilitating CO₂-rock interactions by increasing the reactive surface area. This study investigates the mechanistic effects of acid-induced weakening on fracture propagation and pore structure evolution in basalt. Notched semi-circular bend (NSCB) tests were conducted under various pH conditions, combined with multi-scale characterization techniques including acoustic emission (AE) monitoring, nuclear magnetic resonance (NMR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results show that with decreasing pH, the elastic modulus, peak load, and fracture toughness of basalt significantly decline, while the length of the fracture process zone (FPZ) increases. Meanwhile, the number of AE events and associated energy release intensify, suggesting earlier crack initiation and more rapid propagation. AE responses exhibit earlier onset, higher cumulative energy, and a marked increase in mid-to-low frequency, high-amplitude signals. Additionally, the proportion of tensile mode fractures increases with increasing acidity. NMR results indicate substantial increases in both micro- and macropore volumes following acid treatment. As acidity increases, the spatial and temporal fractal dimensions of AE events, along with the full-scale pore fractal dimension, generally decrease, reflecting enhanced internal connectivity of the pore network. Under stronger acidic conditions, these dimensions increase slightly, implying the development of more complex and dispersed microcracks and pores. The full-scale pore fractal dimension is positively correlated with the spatial and temporal fractal dimensions of AE events. From an engineering perspective, the integration of downhole logging with geophysical monitoring may offer a useful reference for real-time reservoir evaluation, contributing to improved injectivity and CO₂ sequestration efficiency in basalt formations.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"140 ","pages":"Article 105200"},"PeriodicalIF":5.6,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144988620","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":"Experimental study on the failure mechanism of sandstone containing en-echelon joints and anchoring control effect of NPR bolt","authors":"Yuxiang Feng ,&nbsp;Ruixue Zhang ,&nbsp;Zhigang Tao ,&nbsp;Qinzheng Feng","doi":"10.1016/j.tafmec.2025.105207","DOIUrl":"10.1016/j.tafmec.2025.105207","url":null,"abstract":"<div><div>This study systematically investigates the failure mechanisms of en-echelon jointed rock with varying joint dip angles and the bolt anchoring control effects through uniaxial compression tests combined with acoustic emission monitoring and digital image correlation techniques. The results demonstrate that unanchored specimens exhibited through-going failure characteristics, with the severity of failure significantly increasing as the joint dip angle increases. When the joint dip angle ranges from 15° to 45°, the specimens exhibit tensile cracks through-going failure, with AE events being dispersed and strain concentration zones localized around the joints. In contrast, at higher dip angles (60°–75°), the specimens exhibit shear cracks through-going failure, with AE events concentrating during the failure stage and showing higher peak values. Bolt anchoring significantly improves the mechanical properties of en-echelon rock, effectively reducing the degree of failure and strain values. Furthermore, strain values in the anchored zone are lower than in the distal jointed regions. Meanwhile, it leads to more dispersed AE events with lower peak amplitudes during the failure stage. At higher joint dip angles, bolt anchoring transforms the specimen’s failure mode from through-going failure to block failure. Negative Poisson’s Ratio (NPR) bolt anchoring provides better anchoring effects and reduces the transition angle of failure modes. Bolt restraint is pronounced under low dip angle conditions, with axial force increasing sharply during the plastic stage. Under high dip angle conditions, axial force increases sharply only during the failure stage. These findings provide critical insights for optimizing support strategies in en-echelon jointed rock engineering.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"140 ","pages":"Article 105207"},"PeriodicalIF":5.6,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144925452","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":"Hierarchical toughening in Glass/Epoxy Composites: Synergistic effects of fiber texture scale and rubbery nanofiber interleaves on delamination resistance","authors":"Hesamaldin Saghafi ,&nbsp;Isa Ahmadi ,&nbsp;Ramin Khamedi ,&nbsp;Hamed Saghafi ,&nbsp;Andrea Zucchelli","doi":"10.1016/j.tafmec.2025.105208","DOIUrl":"10.1016/j.tafmec.2025.105208","url":null,"abstract":"<div><div>This study investigates synergistic toughening in glass/epoxy composites through fiber texture scaling (560–2000 µm bundles) and NBR/PCL nanofiber interleaves. Coarser textures inherently increased fracture toughness by 95–100 % via fiber bridging and crack-path tortuosity. Nanofiber integration amplified this effect, with coarse-textured nano-modified composites achieving 125 % higher toughness than non-modified counterparts. Key mechanisms included matrix plastic deformation (microvoid formation), enhanced fiber–matrix adhesion (resin-coated fibers), and crack bifurcation. Rising R-curves confirmed progressive energy dissipation, while sawtooth force–displacement patterns revealed intermittent crack arrest at nanofiber-rich zones. SEM analysis showed a transition from brittle failure (smooth interfaces) in non-modified samples to ductile failure (rough, porous morphologies) in nano-modified systems. The macro-nano synergy enabled simultaneous improvements in fracture resistance (G_IC ↑125 %, G_IR ↑162 %), peak load (↑48 %), and energy absorption without compromising in-plane properties. These results establish a multi-scale design paradigm for aerospace/automotive composites requiring balanced delamination resistance and structural efficiency.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"140 ","pages":"Article 105208"},"PeriodicalIF":5.6,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144932099","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 displacement-spatial co-adaptive strategy for the meshfree simulation of brittle phase-field fracture","authors":"Tianlong Ma ,&nbsp;Qiaoling Zhang ,&nbsp;Yongbin Ge ,&nbsp;Wentao Ma","doi":"10.1016/j.tafmec.2025.105191","DOIUrl":"10.1016/j.tafmec.2025.105191","url":null,"abstract":"<div><div>While prior studies have typically explored displacement-adaptive (DA) or spatially adaptive (SA) strategies independently, few have achieved their integration within a unified phase-field framework. To our knowledge, this work presents the first integration of adaptive displacement step-size adjustment and damage-partitioned spatial refinement within the RPIM meshfree framework. For the DA component, we develop a variation-driven step-size adjustment algorithm, in which the next displacement increment is adaptively determined based on the maximum variations of the phase field and history strain energy between successive load steps, as well as the current step size. For the SA component, we embed our previously proposed damage-driven partitioned node refinement scheme [<span><span>1</span></span>], which automatically adjusts nodal density in low-, medium-, and high-damage zones without requiring prior knowledge of the crack path. By combining DA and SA with RPIM’s capabilities (including irregular geometry handling, accurate interpolation, and low mesh sensitivity), the unified DSA accelerates simulations through simultaneous reduction of displacement steps and spatial nodes, significantly improving computational efficiency over using DA or SA alone. Validation on 2D and 3D benchmarks confirms superior adaptivity, efficiency, and accuracy.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"140 ","pages":"Article 105191"},"PeriodicalIF":5.6,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144988619","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 toughness of Khaya ivorensis and Magnolia obovata for mobility applications","authors":"Riccardo Houngbegnon ,&nbsp;Rostand Moutou Pitti ,&nbsp;Valery Doko ,&nbsp;Thomas Jailin ,&nbsp;Benoît Blaysat ,&nbsp;José Xavier ,&nbsp;Nicolas Sauvat ,&nbsp;Joseph Gril ,&nbsp;Naman Recho","doi":"10.1016/j.tafmec.2025.105209","DOIUrl":"10.1016/j.tafmec.2025.105209","url":null,"abstract":"<div><div>This work focuses on the study of the fracture toughness of two wood species. It investigates the opportunity of using alternative wood species to <em>Magnolia obovata</em>, a Japanese species, to design satellites based on wooden structures. The use of wooden structures would enable us to move towards carbon neutrality in the long term. <em>Khaya ivorensis</em>, a tropical species of African origin, is explored in this context. More specifically, a comparison of the fracture processes between <em>Khaya ivorensis</em> and <em>Magnolia obovata</em> is carried out to assess their durability against the loads they may encounter in extreme applications. Tests are conducted in crack opening and mixed modes configurations, using Localized Spectrum Analysis (LSA), an innovative approach for measuring displacement and strain fields. The energy release rates are evaluated using the compliance method under imposed displacement. The decoupling of the fracture modes allowed for determining the contributions of Mode I and Mode II in mixed mode. Additionally, Scanning Electron Microscope (SEM) observations were performed to examine the impact of wood anatomy on fracture surfaces and fracture parameters. <em>Khaya ivorensis</em> demonstrated better fracture performance, revealing results consistent with its density and ribbon-like structure.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105209"},"PeriodicalIF":5.6,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005353","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":"Effects of fissure inclination and spacing on crack evolution and mechanical behavior of 3D-printed horseshoe tunnel models: Experiments and SPH simulations","authors":"Wenbing Zhang ,&nbsp;Yuhui He ,&nbsp;Shuyang Yu ,&nbsp;Mingchao Li ,&nbsp;Danda Shi ,&nbsp;Hongwei Zhang","doi":"10.1016/j.tafmec.2025.105196","DOIUrl":"10.1016/j.tafmec.2025.105196","url":null,"abstract":"<div><div>To elucidate the regulatory mechanisms of prefabricated fissures on the mechanical behavior and crack evolution of horseshoe-shaped tunnels, this study employs sand-based 3D printing technology to fabricate tunnel models containing prefabricated fissures with varying inclinations (<em>θ</em> = 0°–90°) and spacings (<em>L</em> = 30–65 mm). Uniaxial compression tests, coupled with digital image correlation (DIC) and improved smoothed particle hydrodynamics (SPH) simulations, are conducted to systematically investigate the influence of fissure parameters on crack initiation and propagation patterns, peak stress–strain responses, and failure mechanisms. The results demonstrate that fissure inclination governs crack types by modifying the ratio of normal to shear stresses along the fissure plane. At <em>θ</em> = 15°, shear stress predominates, resulting in the lowest peak strength (∼3.0 MPa), whereas at <em>θ</em> = 75°, tensile stress dominates, yielding the maximum peak strength (∼4.8 MPa). Fissure spacing influences failure modes via stress field interaction: significant stress superposition at <em>L</em> = 35 mm leads to pronounced strength degradation (peak stress ∼ 2.5 MPa), while minimal stress interference at <em>L</em> = 50 mm corresponds to optimal mechanical performance (∼4.5 MPa). Observations from DIC and numerical results from SPH simulations collectively validate a chain mechanism linking fissure geometry, stress concentration, and crack propagation. Specifically, small inclinations (0°–30°) and narrow spacings (30–40 mm) facilitate multi-crack coalescence and extensive damage zones, whereas large inclinations (75°–90°) and wider spacings (50–65 mm) favor localized brittle failure. These findings offer quantitative guidance for tunnel stability design under complex geological conditions.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"140 ","pages":"Article 105196"},"PeriodicalIF":5.6,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917837","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":"Prediction of fatigue crack propagation driven by data and model collaboration with probability updates","authors":"Pengfei Ding ,&nbsp;Xinglin Miao ,&nbsp;Zhijie Liu ,&nbsp;Xianzhen Huang ,&nbsp;Yuxiong Li ,&nbsp;Xiaobang Wang","doi":"10.1016/j.tafmec.2025.105197","DOIUrl":"10.1016/j.tafmec.2025.105197","url":null,"abstract":"<div><div>During the service life of engineering structures, fatigue crack propagation is inherently influenced by a multitude of uncertainties, encompassing material inhomogeneities, load fluctuations, and environmental corrosion, making accurate prediction a pivotal challenge in safeguarding structural safety and reliability. This paper proposes a data and model collaborative driving method based on probability updates to achieve high-precision prediction and uncertainty quantification of fatigue crack propagation. Construct a framework by integrating fracture mechanism models, finite element simulations, Bayesian theory, and data processing techniques. Select effective parameter groups based on experimental data confidence intervals, combine maximum likelihood estimation and Akaike information criteria to determine the optimal distribution characteristics of parameters, and use a kriging model to efficiently fit complex nonlinear relationships. Leveraging probability update mechanisms and Markov chain Monte Carlo sampling techniques, the dynamic evolution of parameter distributions from prior to posterior is achieved, thereby enabling quantitative characterization of system uncertainties. Experimental verification shows that the model prediction error is less than 4%, and reliability analysis reveals the decreasing trend of reliability with the number of cycles. The results provide theoretical methods for fatigue life assessment and reliability optimization of engineering structures, and have important guiding significance for structural design and maintenance strategy formulation.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"140 ","pages":"Article 105197"},"PeriodicalIF":5.6,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144932628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fatigue-defect criticality in laser powder bed fused aluminum alloys","authors":"Shaharyar Baig ,&nbsp;Alireza Jam ,&nbsp;Stefano Beretta ,&nbsp;Shuai Shao ,&nbsp;Nima Shamsaei","doi":"10.1016/j.tafmec.2025.105201","DOIUrl":"10.1016/j.tafmec.2025.105201","url":null,"abstract":"<div><div>This study investigated the influence of volumetric defects on the fatigue behavior of laser powder bed fused AlSi10Mg and Scalmalloy, two aluminum alloys with distinct microstructures and potentially different defect sensitivity. Specimens were fabricated in three orientations with different energy inputs, to intentionally induce volumetric defects of varying geometries at reasonable populations. The stress-life fatigue data for both alloys exhibited significant scatter, owing to the differences in the defect characteristics of specimens. Fatigue notch factor-based life estimations, relying on the fatigue limit as a function of the critical defect size, were found to be effective in predicting the stress-life behavior for AlSi10Mg. For Scalmalloy, the location of the defects relative to the bimodal grain structure, as well as some fine-grained regions often serving as crack initiation sites, introduced significant uncertainty in the fatigue limit predictions. As a result, crack growth-based models —instead of notch factor-based ones— were able to sufficiently describe the fatigue behavior of both alloys, with predictions either within a scatter band of 3 or on the conservative side of experimental fatigue lives.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"140 ","pages":"Article 105201"},"PeriodicalIF":5.6,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922825","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":"Machine learning model for fatigue crack growth prediction in marine structural steel under high-low frequency superimposed loading","authors":"Kuilin Yuan ,&nbsp;Guozhao Li ,&nbsp;Runhong Zhang ,&nbsp;Yichen Jiang","doi":"10.1016/j.tafmec.2025.105203","DOIUrl":"10.1016/j.tafmec.2025.105203","url":null,"abstract":"<div><div>Accurate fatigue life prediction in marine structures subjected to combined low-frequency (LF) and high-frequency (HF) cyclic loading is of great significance. This study develops the fatigue crack growth prediction models for marine structural steel under high-low frequency superimposed loading using three machine learning (ML) algorithms: back-propagation (BP) neural network, genetic algorithm optimized BP (GA-BP) neural network and particle swarm optimized BP (PSO-BP) neural network. The ML models are trained and validated by using the dataset of fatigue crack growth tests under various loading conditions with different load amplitude ratios, load frequency ratios and mean load levels. The predictive performance of the three ML models is systematically compared with each other as well as the modified Wheeler model and the Huang model. Results demonstrate that the ML models exhibit superior agreement with experimental data compared to the classical theoretical models, and the GA-BP neural network model achieves the best overall accuracy. These findings suggest that the neural network models, by effectively capturing the interaction effects between LF and HF load components, can provide robust and promising tools for predicting the fatigue crack growth behaviour of marine structures.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"140 ","pages":"Article 105203"},"PeriodicalIF":5.6,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922824","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 void growth-based ductile fracture models incorporating interaction effects of stress triaxiality and Lode angle parameter","authors":"Jingsheng Zhou,&nbsp;Leroy Gardner","doi":"10.1016/j.tafmec.2025.105204","DOIUrl":"10.1016/j.tafmec.2025.105204","url":null,"abstract":"<div><div>The void growth rate in ductile fracture is influenced by both the stress triaxiality and Lode angle parameter. Traditional ductile fracture models often treat these effects independently, combining them as the product of two isolated terms. However, since both stress states affect void geometry, either through volume expansion or shape distortion, the geometry change induced by one may influence that caused by the other, indicating an interaction between the two stress states. This study investigates this interaction through numerical simulations using three-dimensional micromechanical finite element models with a single spherical void. A wide range of stress states are analysed, with both stress triaxiality and Lode angle parameter varying from −1 to 1. Based on the observed interaction effects of the two stress states on void growth, two new ductile fracture models are proposed: the Positive Stress Triaxiality-Lode Angle Parameter Interaction Model (PTLIM), proposed for specimens under monotonic tensile loading, and the Full-range Stress Triaxiality-Lode Angle Parameter Interaction Model (FTLIM), applicable to tension, compression and tension–compression cyclic loading. Both models are validated against 198 fracture coupons, and shown to offer significantly improved accuracy in the prediction of fracture strains over other published models that treat the effects of stress triaxiality and Lode angle parameter as independent terms. This highlights the advantage of accounting for the interaction between these two stress state parameters in fracture strain prediction.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"140 ","pages":"Article 105204"},"PeriodicalIF":5.6,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144925454","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}