Theoretical and Applied Fracture Mechanics最新文献

{"title":"Experimental investigation of crack evolution and failure behaviors in dual-curved flawed shale under hydraulic-mechanical loading","authors":"Wei Yi ,&nbsp;Shuxin Huang ,&nbsp;Binghui Xu ,&nbsp;Mingfeng Lei ,&nbsp;Yinian Wu ,&nbsp;Chaojun Jia ,&nbsp;Qiujing Pan","doi":"10.1016/j.tafmec.2025.105264","DOIUrl":"10.1016/j.tafmec.2025.105264","url":null,"abstract":"<div><div>Investigating crack evolution and failure behaviors in flawed shale under hydro-mechanical loading holds critical significance for improving reservoir stimulation efficiency, and ensuring wellbore stability in shale gas development. While existing studies mainly focus on straight-flawed rock and rock-like under single stress state, the behavior of bedding shale with curved flaws under hydro-mechanical loading remains poorly understood. Additionally, digital image correlation (DIC) techniques, though effective in monitoring crack propagation under compression, have rarely been applied in hydro-mechanical conditions. This study developed a transparent enclosure apparatus capable of applying hydraulic pressure directly to crack surfaces in shale specimens. A series of systematic hydraulic-mechanical experiments, combined with DIC technique, were performed on bedding shale specimens with dual circular arc flaws, to investigate the effects of hydraulic pressure (<em>P</em><em>_H</em>), bedding angle (<em>α</em>), and flaw curvature (<em>κ</em>) on crack propagation process and failure behaviors. Quantitative characterization of crack network complexity and connectivity was achieved through fractal dimension and topological analysis. Result shows that <em>α</em> has a greatest impact on the compaction stage, followed by <em>P</em>_<em>H</em>, and finally <em>κ</em>, with increasing <em>P</em>_<em>H</em> and <em>α</em> progressively suppressing compaction effects until near elimination. Nine crack types are identified, with <em>α</em> exerting a stronger influence than <em>P</em>_<em>H</em> and <em>κ</em>, particularly at larger <em>α</em>. <em>κ</em> predominantly controls non-tip crack initiation, followed by <em>α</em>, while <em>P</em>_<em>H</em> plays the minimal effect. Non-tip crack initiation usually appears in conjunction with the non-tip coalescence of rock bridges. The highest crack network complexity (<em>D</em> = 1.381) corresponds to moderate connectivity (normalized parameter <span><math><mrow><msubsup><mi>η</mi><mi>C</mi><mo>′</mo></msubsup></mrow></math></span> = 0.667), whereas the greatest connectivity (<em>D</em> = 0.737) exhibits lower complexity (<span><math><mrow><msubsup><mi>η</mi><mi>C</mi><mo>′</mo></msubsup></mrow></math></span> = 1.363), indicating no direct correlation between the crack network complexity and connectivity. The complexity of the crack network does not exhibit a direct correlation with its connectivity, and greater complexity degree of crack network does not necessarily result in a larger connectivity. This study might provide valuable insights into the crack evolution and failure behavior of shale, contributing to the advancement of shale gas exploration strategies</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105264"},"PeriodicalIF":5.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267853","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":"Mechanical properties and failure mechanism of limestone containing notches subjected to uniaxial compression: An experimental and numerical study","authors":"Peiyao Li ,&nbsp;Xinrong Liu ,&nbsp;Xueyan Guo ,&nbsp;Xinyang Luo ,&nbsp;Gen Wang","doi":"10.1016/j.tafmec.2025.105266","DOIUrl":"10.1016/j.tafmec.2025.105266","url":null,"abstract":"<div><div>The formation of rock cavities influences the cracking behavior of rock and threatens the stability of slopes. To address this issue, mechanical tests and numerical simulation were conducted to investigate the failure mechanism and mechanical properties of rock containing notches. Firstly, uniaxial compression tests were carried out to clarify the failure process of rock specimens and analyze the influence of the notch geometric parameters (height and inclination) on the mechanical properties of rocks. Meanwhile, based on the test data, the energy evolution of notched rocks during the loading process was elucidated. Furthermore, PFC simulation was employed to reveal the damage evolution of notched rock specimens; combined with the moment tensor theory, the acoustic emission characteristics during rock failure were analyzed in depth. The research results indicate that notches significantly reduce the strength and stiffness of intact rocks and simultaneously change stress distribution, leading to obvious stress concentration around notches. The moment magnitudes of acoustic emission events generated near the notches are significantly higher than those of acoustic emission events at the crack tips. During rock failure process, tensile and implosive cracks predominate, while the proportion of shear cracks is relatively low (approximately 20 %). In addition, changes in the inclination angle and height of the notches also affect the mechanical properties (strength and stiffness) and failure characteristics of the rocks. Finally, implications and limitations of this study for rock engineering are discussed. Overall, this study provides a comprehensive insight into the mechanical properties and failure mechanism of notched rocks under uniaxial compression.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105266"},"PeriodicalIF":5.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268352","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 mode I fracture behavior of frozen soil under impact loading and FDEM numerical simulation: Based on a rate-dependent elastoplastic and cohesive model","authors":"Taiyu Zhang ,&nbsp;Zhiwu Zhu ,&nbsp;Fulai Zhang","doi":"10.1016/j.tafmec.2025.105261","DOIUrl":"10.1016/j.tafmec.2025.105261","url":null,"abstract":"<div><div>The dynamic fracture behavior of frozen soil under impact loading is critical for ensuring the structural stability and service safety of infrastructure in cold regions exposed to extreme loading conditions. In this study, impact experiments were conducted on cracked straight-through flat Brazilian disk specimens under varying temperatures (−5, −15, and − 25 °C) and strain rates (100–250 s⁻¹). The crack propagation behavior, mode I dynamic fracture toughness, energy dissipation mechanisms, and responses to temperature and strain rate were systematically investigated. The results indicated that the mode I dynamic fracture toughness of frozen soil increased approximately linearly with strain rate. Low temperatures increased strain rate sensitivity. At high strain rates, the extent of specimen failure and fracture energy increased significantly. Furthermore, a finite–discrete element model incorporating rate-dependent elastoplastic behavior and a cohesive failure criterion was developed to investigate the dynamic fracture behavior of frozen soil. The spatial distribution of the cracks and evolution of the fracture modes at different strain rates were quantitatively analyzed. Simulation results demonstrated that as the strain rate increased from 100 to 250 s⁻¹, the total number of cracks increased exponentially. Shear cracks increased from 7 % to 23 %, whereas tensile cracks decreased from 93 % to 77 %. The initial inclination angle of the central crack significantly affected the fracture modes and propagation paths of the cracks. The numerical simulation results closely matched the experimental observations of crack propagation paths, failure modes, and fracture toughness evolution, indicating that the proposed numerical model effectively captures the dynamic fracture behavior of frozen soil.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105261"},"PeriodicalIF":5.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220873","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":"Toughness and energy based tensile-shear cracking resistance of green concrete developed using zeolite and waste rubber particles","authors":"Reza Sagheb,&nbsp;Mahmoud Miri,&nbsp;Hamed Ghohani Arab,&nbsp;Iman Afshoon","doi":"10.1016/j.tafmec.2025.105263","DOIUrl":"10.1016/j.tafmec.2025.105263","url":null,"abstract":"<div><div>This study explores the mixed-mode fracture behavior of sustainable concretes incorporating waste rubber particles and natural zeolite, addressing a gap in the literature where the combined influence of these two materials on fracture performance has not been evaluated. Experimental data from control, rubber-modified (15 %, 30 %, and 45 %), zeolite-modified (5 %, 10 %, 15 %), and hybrid concrete mixtures were analyzed for effective fracture toughness and fracture energy across mode mixity ranging from pure shear to pure tensile. Results show rubber reduces effective fracture toughness (up to 44 %) and fracture energy (up to 65 %) due to matrix softening, with greater shear-mode fracture energy loss from weakened frictional resistance. Zeolite enhances fracture toughness (up to 25 %) and fracture energy (up to 90 %), but high doses (15 %) diminish both due to porosity. Interaction plots reveal no significant fracture toughness interaction with rubber, zeolite, or mode mixity, indicating mode-independent crack initiation effects, while fracture energy exhibits significant interactions; rubber impacts shear fracture more, and zeolite boosts shear fracture energy preferentially. Zeolite's reinforcing effect on fracture energy excels at low rubber content. Regression analysis progresses from linear (Model-1: <em>R</em>^<em>2</em> = 50 % for fracture toughness, 72 % for fracture energy) to cubic-interaction models (Model-4: <em>R</em>^<em>2</em> = 91 % fracture toughness, 95 % fracture energy), with Model-4 best capturing non-linearities and interactions for precise optimization.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105263"},"PeriodicalIF":5.6,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221508","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":"Modelling dynamic brittle fracture with fourth-order phase-field integrated Eulerian SPH","authors":"Vishabjeet Singh ,&nbsp;Md Rushdie Ibne Islam","doi":"10.1016/j.tafmec.2025.105257","DOIUrl":"10.1016/j.tafmec.2025.105257","url":null,"abstract":"<div><div>Dynamic brittle fracture presents substantial numerical challenges due to the complex nature of crack initiation, propagation, branching, and fragmentation. In this work, we develop a fourth-order phase-field model for brittle fracture within the Eulerian Smoothed Particle Hydrodynamics (ESPH) framework. The use of higher-order spatial derivatives in the phase-field formulation enables enhanced resolution of crack topology, stable interfaces and smoother energy dissipation. The ESPH method, operating in the current configuration, is particularly suited for modelling large deformations and complex fracture behaviours without the need for remeshing, which might be required for mesh-based methods. We validate our model against several benchmark problems, such as dynamic crack branching in notched plates under tensile loading and asymmetric crack propagation in three-point bending tests. The results highlight the capability of the proposed fourth-order ESPH-phase-field model to accurately predict crack paths, branching, and coalescence phenomena with improved interface regularity and numerical robustness.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105257"},"PeriodicalIF":5.6,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220871","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":"Three-dimensional numerical elastoplastic analysis of stress and strain fields near a crack tip","authors":"Mateus B. Neiva ,&nbsp;Carlos A. Almeida ,&nbsp;Ivan F.M. Menezes","doi":"10.1016/j.tafmec.2025.105255","DOIUrl":"10.1016/j.tafmec.2025.105255","url":null,"abstract":"<div><div>The presence of crack defects is of paramount importance in structural life prediction analyses. Basic studies utilizing the Linear Elastic Fracture Mechanics approach show that the Stress Intensity Factor (SIF) largely governs Fatigue Crack Growth (FCG). However, overloads may induce material “memory effects” that delay, arrest, or accelerate the FCG rate — a behavior that cannot be described adequately using a single elastic parameter analysis. To address service-variable amplitude loadings, recent research has proposed using a prescribed stress–strain distribution as the driving force of FCG, based on the critical damage approach. Due to the assumptions made in these analytical derivations, significant equilibrium and compatibility conditions are violated in the resulting solutions, as they rely on an idealized singular stress–strain field at the crack front region. This work provides a comprehensive review of published analytical results for solutions under both elastic and elastoplastic material behavior regimens, including Williams and HRR, which assume a singular stress distribution field, and Creager–Paris, which assumes a non-singular stress field but remains within the elastic range of the material. These solutions are compared throughout the study, with results obtained from numerical analysis using a 3D finite element discretization, applying the elastoplastic von Mises yielding criterion, to model the blunt crack tip. From this comparison, we derive conclusions regarding the application limits of the theoretical models and the required scope of numerical model representation. In addition to monotonically increasing applied loads, this work also considers unloading conditions as a main contribution to the proposed numerical analysis.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105255"},"PeriodicalIF":5.6,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220872","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 effect of cyclic thermal shock on the mixed mode I-II fracture characteristics of granite","authors":"Wen Hua ,&nbsp;Wenyu Zhang ,&nbsp;Shiming Dong ,&nbsp;Mao Zhou ,&nbsp;Ziran Zhang","doi":"10.1016/j.tafmec.2025.105258","DOIUrl":"10.1016/j.tafmec.2025.105258","url":null,"abstract":"<div><div>Thermal shock cycling induces progressive strength degradation in rock masses, significantly compromising the stability of underground excavations. By using central cracked Brazilian disc (CCBD) specimens, the pure mode I, pure mode II and mixed mode I-II fracture characteristics of thermally treated granite under heating-cooling cycles were investigated. The study focused on the effects of thermal shock cycling on the fracture mechanical behavior of granite, particularly in terms of crack propagation morphology, load-displacement response, and the evolution of fracture toughness. Meanwhile, scanning electron microscope (SEM) technology was also used to analyze the microstructure changes of granite, exploring the damage mechanism behind the deterioration of macroscopic mechanical properties. The results show that with the increase of temperature and cycle times, both mode I and mode II fracture components (<em>K</em>_I, <em>K</em>_II) of granite specimens exhibit a decreasing trend under all loading conditions. Among them, the degradation effect of thermal shock cycling on <em>K</em>_I is greater than that on <em>K</em>_II. Thermal shock cycling induced damage in granite shows pronounced temperature sensitivity, with 300 °C conditions producing damage nearly triple those observed at 100 °C. The strength degradation in granite primarily results from microstructural alterations induced by the coupled effects of cyclic thermal stresses and hydrothermal interactions.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105258"},"PeriodicalIF":5.6,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the fracture behavior and ductility of self-compacting concrete containing recycled nylon granules: An experimental and modeling study","authors":"Sadegh Abedi Mavaramkolaei ,&nbsp;Mohammad Ali Sayarinejad ,&nbsp;Ali Nazari ,&nbsp;Morteza Rayati Damavandi","doi":"10.1016/j.tafmec.2025.105254","DOIUrl":"10.1016/j.tafmec.2025.105254","url":null,"abstract":"<div><div>Utilizing polymer waste materials like compacted nylon as partial aggregate substitutes in concrete mixtures represents a viable strategy to mitigate environmental concerns. This incorporation also affects the mechanical fracture response of self-compacting concrete (SCC), improving its ductility and energy absorption capacity. The present research evaluates how introducing nylon granules in place of fine aggregates at replacement levels of 0 %, 5 %, 10 %, and 15 % influences SCC's fracture and ductility properties through the application of the Boundary Effect Method (BEM). A total of 48 notched beams were tested in a servo-controlled testing system employing the three-point bending test. The results indicate that increasing the nylon granule replacement level in SCC up to 15 % led to reductions of approximately 24 %, 19 %, and 20 % in the size-independent fracture energy (<span><math><mrow><msub><mi>G</mi><mi>F</mi></msub></mrow></math></span>), the initial fracture energy (<span><math><mrow><msub><mi>G</mi><mi>f</mi></msub></mrow></math></span>), and the fracture toughness (<span><math><mrow><msub><mi>K</mi><mi>IC</mi></msub></mrow></math></span>), respectively. Moreover, the results of the reference crack length parameter (<span><math><mrow><msubsup><mi>α</mi><mo>∞</mo><mo>∗</mo></msubsup></mrow></math></span>) indicated that by increasing the nylon granule content, the concrete became more ductile and its design criterion complied with the strength criterion. An increase in nylon granule content up to 15 % led to a rise in parameter <span><math><mrow><msubsup><mi>α</mi><mo>∞</mo><mo>∗</mo></msubsup><mspace></mspace></mrow></math></span>of the SCC specimens. This rise was approximately 23 % compared with the reference specimen (concrete without nylon granules). On average, the <span><math><mrow><msub><mi>G</mi><mi>F</mi></msub><mo>/</mo><msub><mi>G</mi><mi>f</mi></msub><mspace></mspace></mrow></math></span>ratio obtained from BEM for SCC specimens containing nylon granules was found to be 3.17. Finally, the mechanical properties data and experimental variables were utilized to develop multivariate predictive models for fracture parameters in SCC incorporating nylon particles. A comparison of the current experimental results with findings reported in the literature confirmed that the models exhibit acceptable accuracy and reliability.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105254"},"PeriodicalIF":5.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220877","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":"Extension and applications of rate-dependent cohesive zone models to mixed mode damage","authors":"Jia Li ,&nbsp;Yao Shan ,&nbsp;Yu Yan ,&nbsp;Shunhua Zhou ,&nbsp;Xiaoping Ji ,&nbsp;Zhiqiang Shu ,&nbsp;Ke Xiang","doi":"10.1016/j.tafmec.2025.105250","DOIUrl":"10.1016/j.tafmec.2025.105250","url":null,"abstract":"<div><div>Interfacial bonding failure between asphalt concrete and rail wrapping materials is a major challenge in tram track systems. The combination of complex stress conditions and the viscoelastic nature of asphalt makes traditional rate-dependent cohesive zone model (CZM) insufficient to describe mixed mode (I/II/III) fracture. In this study, a novel mixed mode rate-dependent CZM is proposed. The model integrates three orthogonal Maxwell elements with energy-driven damage initiation and evolution criteria, enabling a coupled description of multi-directional fracture in viscoelastic interfaces for the first time, and numerical implementation is accomplished via ABAQUS user material subroutine (UMAT). To address the high-dimensional parameter space of the proposed model, an inverse analysis framework is developed for efficient parameter identification. Experimental validation is performed through interfacial fracture tests on asphalt concrete-rail wrapping material composite specimens under varying loading rates and out-of-plane loading angles, confirming the model's ability to capture mixed-mode fracture behavior and rate-dependent failure mechanisms. The constitutive model is then implemented in a 3D solid finite element model of tram tracks to quantitatively evaluate interfacial bonding failure under typical operating speeds. Results indicate that that interface damage is increased with decreasing speed, that outer rail interface damage is more severe than inner rail damage, and that damage is propagated from the bottom to the top along the depth direction.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105250"},"PeriodicalIF":5.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220875","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":"DA-DONN: A data-augmented and dual-optimized neural network method for fatigue crack growth rate prediction","authors":"Hui Sun,&nbsp;Zheng Liao,&nbsp;Zhihui Hu,&nbsp;Gongxian Wang,&nbsp;Xiheng Ruan,&nbsp;Xingshuo Wang,&nbsp;Jianmin Lu","doi":"10.1016/j.tafmec.2025.105256","DOIUrl":"10.1016/j.tafmec.2025.105256","url":null,"abstract":"<div><div>Accurate prediction of fatigue crack growth rate (FCGR) is of great significance in the field of materials science and engineering. To address the limitations of existing prediction methods due to data scarcity and suboptimal model performance, this paper proposes a method called the Data-Augmented and Dual-Optimized Neural Network (DA-DONN). The method employs piecewise cubic Hermite interpolation (PCHIP) to augment the FCGR data, thereby alleviating the small-sample problem. Bayesian optimization (BO) is used to tune the hyperparameters of the neural network, and the horned lizard optimization algorithm (HLOA) is applied to optimize the initial weights and biases, thus improving the prediction accuracy. Experimental results indicate that DA-DONN achieves a significantly lower MSE than SA-DNN on the 7075 aluminum alloy test set. On the 6013 aluminum alloy dataset, DA-DONN also outperforms DLFCO-DNN and MFA-DNN in terms of MAE, RMSE, and Mean RE, demonstrating its superior accuracy and practical feasibility.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"141 ","pages":"Article 105256"},"PeriodicalIF":5.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221509","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}