{"title":"Data-Driven Estimation of Fatigue Parameters in Concrete: A Minimal-Input Approach Based on Compressive Strength","authors":"René Panian, Mahdi Yazdani","doi":"10.1111/ffe.70221","DOIUrl":"https://doi.org/10.1111/ffe.70221","url":null,"abstract":"<div>\u0000 \u0000 <p>Given the key role of concrete in civil infrastructure, assessing its performance under fatigue loading remains a persistent challenge, largely due to the reliance of fatigue parameters on case-specific experimental data, which are often unavailable in real-world engineering practice. To address this limitation, this study developed an empirical framework for estimating fatigue parameters of concrete based on an integrated literature analysis, eliminating the need for costly and extensive laboratory testing. By employing statistical analysis and machine-learning techniques, the research proposed predictive relationships for Paris' law parameters (\u0000<span></span><math>\u0000 <mi>C</mi></math> and \u0000<span></span><math>\u0000 <mi>m</mi></math>), threshold stress intensity factor (\u0000<span></span><math>\u0000 <mo>∆</mo>\u0000 <msub>\u0000 <mi>K</mi>\u0000 <mi>th</mi>\u0000 </msub></math>), and critical stress intensity factor or fracture toughness (\u0000<span></span><math>\u0000 <msub>\u0000 <mi>K</mi>\u0000 <mi>c</mi>\u0000 </msub></math>) of concrete. In this approach, compressive strength (\u0000<span></span><math>\u0000 <msubsup>\u0000 <mi>f</mi>\u0000 <mi>c</mi>\u0000 <mo>′</mo>\u0000 </msubsup></math>) serves as the primary predictor to reflect its fundamental influence on fatigue resistance. The proposed relationships enable efficient and practical evaluation of fatigue behavior of concrete, thereby facilitating the assessment and design of concrete infrastructure subjected to fatigue loads.</p>\u0000 </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1809-1823"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147715250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shaymaa Merheb, Dmytro Vasiukov, Modesar Shakoor, Hugo Heyraud, Daniella Guedes Sales, Philippe Rohart, Samir Assaf, Salim Chaki
{"title":"Numerical Modeling of Hydrogen-Assisted Cracking With Phase Field Regularized Cohesive Zone Model and Penalty-Based Moving Hydrogen Boundary Condition","authors":"Shaymaa Merheb, Dmytro Vasiukov, Modesar Shakoor, Hugo Heyraud, Daniella Guedes Sales, Philippe Rohart, Samir Assaf, Salim Chaki","doi":"10.1111/ffe.70226","DOIUrl":"https://doi.org/10.1111/ffe.70226","url":null,"abstract":"<p>The degradation of metallic materials due to hydrogen embrittlement (HE) poses critical challenges for structural reliability. Phase-field models offer an energy-based approach that does not require predefined crack paths and automatically determines crack initiation, growth, and coalescence. However, conventional implementations of the phase-field regularized cohesive zone model (PF-CZM) apply hydrogen boundary conditions only on the initial external surfaces, neglecting the exposure of newly formed crack surfaces. To address this limitation, this study refines the PF-CZM by incorporating a penalty approach to implicitly enforce moving hydrogen boundary conditions, ensuring realistic hydrogen exposure on evolving crack surfaces. Numerical examples demonstrate the model's effectiveness in modeling crack propagation from structural defects and highlight its capability to handle complex crack patterns. The results also show the significant influence of the moving hydrogen boundary condition in nonuniform exposure scenarios, where accelerated crack growth, elevated local hydrogen concentrations, and a transition toward brittle failure are captured.</p>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1824-1844"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ffe.70226","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147714915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
João Teixeira Oliveira de Menezes, Marco Mariani, Nora Lecis, Enrique Mariano Castrodeza
{"title":"Influence of Crack Plane Orientation on the Fracture Toughness of 316L Stainless Steel Produced by Binder Jetting","authors":"João Teixeira Oliveira de Menezes, Marco Mariani, Nora Lecis, Enrique Mariano Castrodeza","doi":"10.1111/ffe.70197","DOIUrl":"https://doi.org/10.1111/ffe.70197","url":null,"abstract":"<div>\u0000 \u0000 <p>Binder jetting, an indirect additive manufacturing technique based on powder processing, comprises two fundamental stages: the deposition of a liquid binder to create a green structure and a densification stage through thermal treatments, which includes curing, debinding, and sintering procedures. The microstructural evolution during these thermal processes is a determining factor for the mechanical behavior and properties of the material. In this study, tensile tests were performed according to the ASTM E8/E8M standard, and fracture tests were conducted according to the ASTM E1820 standard on 316L stainless steel specimens processed by binder jetting. Two different crack plane orientations were tested to study their influence on mechanical performance. Furthermore, microstructural analysis highlighted the role of residual porosity in providing a direct correlation with the observed fracture toughness values. The findings contribute to a deeper understanding of the structure–property relationships in binder-jetted metals and offer pathways for enhancing their mechanical reliability in engineering applications.</p>\u0000 </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1610-1624"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147715021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yousheng Qian, Tiejun Tao, Liansheng Liu, Xingchao Tian, Shuai Song
{"title":"Influence of Crustal Stress on Explosion Crack Propagation Behavior and Application in Shallow and Deep Buried Tunnel Engineering","authors":"Yousheng Qian, Tiejun Tao, Liansheng Liu, Xingchao Tian, Shuai Song","doi":"10.1111/ffe.70199","DOIUrl":"https://doi.org/10.1111/ffe.70199","url":null,"abstract":"<div>\u0000 \u0000 <p>Rational utilization of the guiding effect of crustal stress on explosive crack can significantly enhance blasting efficiency. This paper modified the calculation models for the crushed zone and fractured zone in tunnels at different burial depths and validated the models using numerical simulation methods. The influencing factors of blasting crack extension in deep and shallow buried roadways were analyzed, and the guiding significance of crack extension characteristics on the design of blasthole mesh parameters was discussed. The results show that the error in the theoretical calculations is controlled within 6%, indicating a high degree of accuracy. The longest radial main cracks appeared in the directions of 75°–90°, 70°–72°, and 74° in the blast holes for burial depths <i>H</i> ≤ <i>h</i><sub><i>q</i></sub>, <i>h</i><sub><i>q</i></sub> <i>< H</i> ≤ <i>H</i><sub><i>P</i></sub>, and <i>H</i> > <i>H</i><sub><i>P</i></sub>, respectively. Blasting yields optimal results when the blasthole alignment follows the direction of main fracture propagation.</p>\u0000 </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1625-1643"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147715142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Run Wang, Jing Li, Xiao-long Li, Juan Ma, Giuseppe Muscolino
{"title":"A Three-Parameter Multiaxial Fatigue Life Prediction Model Considering the Influence of Mean Stress","authors":"Run Wang, Jing Li, Xiao-long Li, Juan Ma, Giuseppe Muscolino","doi":"10.1111/ffe.70225","DOIUrl":"https://doi.org/10.1111/ffe.70225","url":null,"abstract":"<div>\u0000 \u0000 <p>Since the Manson–Coffin model cannot characterize the existence of a fatigue limit, this paper develops a novel multiaxial fatigue life prediction model that accounts for the significant influence of mean stress and non-proportional loading-induced additional hardening on multiaxial fatigue life. The proposed model is based on a generalized three-parameter framework that accounts for mean stress effects. Furthermore, this developed model incorporates the Walker exponent to reflect material sensitivity to mean stress and utilizes a damage parameter defined on the critical plane to account for multiaxial fatigue loading. A comparative analysis of predicted and experimental results was conducted using 484 experimental data points collected from the literature for 14 different materials. The statistical assessment shows that 93.4% of the data points fall within a factor-of-three life scatter band, demonstrating that the proposed multiaxial fatigue model offers good prediction accuracy and wide material applicability.</p>\u0000 </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1861-1876"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147714916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nai-Jian Dong, Ze-Yi Xu, Jian-Feng Wen, Shan-Tung Tu
{"title":"Reduced Tensile Ductility Induced by Intergranular Cracking of Laser Powder Bed Fused Alloy 718 at 650°C","authors":"Nai-Jian Dong, Ze-Yi Xu, Jian-Feng Wen, Shan-Tung Tu","doi":"10.1111/ffe.70228","DOIUrl":"https://doi.org/10.1111/ffe.70228","url":null,"abstract":"<div>\u0000 \u0000 <p>The limited high-temperature ductility of laser powder bed fused (LPBF) Inconel 718 restricts its use in aerospace and nuclear industries. This study elucidated the mechanisms responsible for reduced ductility of LPBF Inconel 718 at 650°C compared with room temperature (RT). Although strength and ductility were high at RT, tensile properties fell sharply at 650°C, with elongation dropping to 21% of RT. The ductility loss manifests as pronounced intergranular fracture, driven by inherent strain localization along high-angle grain boundaries at 650°C and intensified by MC-type carbide precipitation at grain boundaries. A damage model integrated within a crystal plasticity framework, incorporating geometrically necessary dislocation (GND) and statistically stored dislocation (SSD), successfully simulated GND-dominated intergranular fracture at 650°C and SSD-dominated transgranular fracture at RT. This study uncovers tensile fracture mechanisms of LPBF Inconel 718 across temperatures, providing insights for the reliable use of additively manufactured superalloys in high-temperature applications.</p>\u0000 </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1895-1911"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147714917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Static Assessment of Hybrid Double-Lap Bolted Joints With Additively Manufactured 316L Plates","authors":"Hasan Almuhanna, Giacomo Torelli, Luca Susmel","doi":"10.1111/ffe.70218","DOIUrl":"https://doi.org/10.1111/ffe.70218","url":null,"abstract":"<p>The present study examines the static response and evaluates the accuracy of design standards and selected literature-based design criteria in estimating the load capacity of the inner plates of double-lap shear bolted connections in single- and double-bolt configurations. The analysis is based on 70 experiments previously reported by the authors, including conventional and additively manufactured inner plates produced by wire arc additive manufacturing and selective laser melting. While additively manufactured plates exhibited load capacities comparable to conventional plates, they generally showed reduced ductility. Experimental load capacities are compared against the European standards EC3-1-8 and EC3-1-4 and the American standard AISC 370. Although originally developed for carbon steel, EC3-1-8 provided the most accurate estimations, whereas EC3-1-4 and AISC 370 consistently overestimated the load capacity. Literature-based equations showed the closest agreement, highlighting limitations in current standards for additively manufactured bolted plates.</p>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1721-1741"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ffe.70218","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147715141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Guang Wu, Yuwen Chen, Tao Liao, Xingjia Xiong, Nanhai Ye
{"title":"An Enhanced Nonlinear Fatigue Cumulative Damage Model Based on Load Interaction and Material Properties","authors":"Guang Wu, Yuwen Chen, Tao Liao, Xingjia Xiong, Nanhai Ye","doi":"10.1111/ffe.70229","DOIUrl":"https://doi.org/10.1111/ffe.70229","url":null,"abstract":"<div>\u0000 \u0000 <p>To address the challenge of predicting material fatigue life under variable-amplitude loading, this paper proposes an improved Manson–Halford (M-H) nonlinear cumulative damage model. The enhanced model comprehensively considers load interactions and material property parameters. Firstly, the strength degradation coefficient is derived by establishing a novel residual strength model requiring no additional parameter fitting. Combined with the load amplitude ratio, this effectively captures the coupled effects of load interaction and strength degradation. Secondly, the elastic modulus parameter is introduced to modify the characteristic exponent of the fatigue life ratio in the M-H model, thereby enhancing the sensitivity of fatigue damage to different materials. Finally, validation against experimental data from six different metallic materials under two-level and multilevel loading conditions demonstrated that this model exhibits superior robustness and predictive accuracy compared to other modified M-H models. This model provides a more physically grounded and readily applicable tool for fatigue life assessment under complex loading conditions.</p>\u0000 </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1845-1860"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147714940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gabriel de Castro Coêlho, Júlio Feitosa da Silva Neto, Antonio Almeida Silva, Marco Antonio dos Santos
{"title":"Influence of Surface Flaw Interaction on Failure Assessment Diagram in the Framework of Fitness-for-Service Procedures","authors":"Gabriel de Castro Coêlho, Júlio Feitosa da Silva Neto, Antonio Almeida Silva, Marco Antonio dos Santos","doi":"10.1111/ffe.70243","DOIUrl":"https://doi.org/10.1111/ffe.70243","url":null,"abstract":"<p>This study investigates the influence of closely spaced surface-flaw interaction on failure assessment diagrams (FADs) used in fitness-for-service evaluations, addressing the conservatism introduced when standards such as BS 7910 and API 579 recharacterize interacting flaws as a single bounding crack. Finite element analyses were conducted on tension-loaded ASTM A516 Gr.70 plates containing two semielliptical surface flaws, with systematic variation of aspect ratio, depth ratio, and coplanar spacing. Elastic and elastic–plastic J-integrals were employed to construct advanced FADs and quantify interaction effects. Results indicate that decreasing coplanar spacing significantly reduces the FAD safe region due to increased plastic contributions, with depth ratio identified as the dominant parameter controlling crack-driving force amplification. Although the bounding flaw methodology ensures safety, it can be excessively conservative, particularly for deep, closely spaced flaws, leading to allowable stress reductions exceeding 80%. A refined approach based on the deepest flaw is proposed, maintaining conservatism while substantially improving prediction accuracy.</p>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1877-1894"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ffe.70243","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147714941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lunan Wang, Jiahao Zhang, Xiaomeng Yin, Hongyu Bai, Yan Wang
{"title":"Effect of Cyclic Freeze–Thaw Treatments on Progressive Failure Characteristics and Local Damage of Granite","authors":"Lunan Wang, Jiahao Zhang, Xiaomeng Yin, Hongyu Bai, Yan Wang","doi":"10.1111/ffe.70215","DOIUrl":"https://doi.org/10.1111/ffe.70215","url":null,"abstract":"<div>\u0000 \u0000 <p>Rock deterioration induced by freeze–thaw (FT) weathering threatens the stability and safety of rock engineering in cold areas. To investigate the effect of cyclic FT treatments on progressive failure characteristics and damage evolution of rocks, the uniaxial compression test and digital image correlation technology were conducted on granite specimens treated with different FT cycles. Results indicate that with increasing FT cycles, the characteristic stresses decrease linearly to varying degrees. The progressive failure process is accompanied by the change in the distribution characteristics of full-field strains and the development of local damage. The skewness and kurtosis of strain distribution curves decrease gradually with increasing stress levels and decreasing FT cycles, while the shape is always right-skewed and steep. Furthermore, the local damage development is progressively improved during loading, exhibiting the enhancements of severity and linearity. Additionally, the cyclic FT treatments exert a promoting effect on the local damage development. The increased FT cycles expand the strain difference and weaken the material stiffness, resulting in a higher level of local damage development.</p>\u0000 </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"49 5","pages":"1579-1596"},"PeriodicalIF":3.2,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147714956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}