International Journal of Fatigue最新文献_第10页

A comprehensive study on the effects of the macromolecular network structure on the fatigue properties and damage modes of natural rubber 大分子网络结构对天然橡胶疲劳性能和损伤模式影响的综合研究

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-06-06 DOI: 10.1016/j.ijfatigue.2025.109014

G. Delahaye , G. Delaporte , Y. Mouslih , J. Rosselgong , S.M. Guillaume , B. Ruellan , I. Jeanneau , J.-B. Le Cam

{"title":"A comprehensive study on the effects of the macromolecular network structure on the fatigue properties and damage modes of natural rubber","authors":"G. Delahaye , G. Delaporte , Y. Mouslih , J. Rosselgong , S.M. Guillaume , B. Ruellan , I. Jeanneau , J.-B. Le Cam","doi":"10.1016/j.ijfatigue.2025.109014","DOIUrl":"10.1016/j.ijfatigue.2025.109014","url":null,"abstract":"<div><div>The present study investigates the effects of the macromolecular network structure, <em>i.e.</em>, the active chain density and cross-link length, on the fatigue resistance of carbon-black filled natural rubber. A wide range of vulcanization systems (conventional, semi-efficient and efficient) and conditions (time and temperature) have been considered. The active chain density was evaluated by swelling tests and using the Flory–Rehner relationship. Uniaxial fatigue tests under relaxing and non-relaxing tension loading conditions were performed, in order to characterize the fatigue resistance and the fatigue lifetime reinforcement. Moreover, a complementary post-mortem analysis at both the macro- and the microscopic scales was systematically carried out to understand the link between the damage mechanisms and the macromolecular network structure. The active chain density was found to drive the fatigue properties and damage mechanisms. Furthermore, the fatigue lifetime reinforcement and the markers of the strain-induced crystallization have been correlated. They both depend on the active chain density and the strain level. Long cross-link length enhanced the fatigue properties at low active chain density, but this effect tends to decrease as the active chain density increases for relaxing tension loadings. <em>A contrario</em>, the cross-link length was found to have negligible effect on the fatigue lifetime reinforcement and damage mechanisms. The vulcanization time showed a strong effect for long cross-link length, while no effect was observed for short cross-links. The vulcanization temperature had only slight effect on fatigue resistance for each vulcanization system studied. Finally, several diagrams were proposed to fully describe and characterize the relationship between active chain density, fatigue properties and damage mechanisms.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109014"},"PeriodicalIF":5.7,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548581","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}

引用次数: 0

Influence of acid environment on the fatigue behavior of short glass fiber polyamide 6/6.6 (35% wt.) composites 酸性环境对短玻璃纤维聚酰胺6/6.6 （35% wt.）复合材料疲劳性能的影响

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-06-03 DOI: 10.1016/j.ijfatigue.2025.109084

Florent Alexis , Sylvie Castagnet , Carole Nadot-Martin , Gilles Robert , Peggy Havet

引用次数: 0

Revealing anisotropic fatigue behavior and multiscale failure mechanisms of bio-inspired heterogeneous glass sponge lattice structures fabricated by laser powder bed fusion under high-cycle compression fatigue 高周压缩疲劳下激光粉末床熔接仿生非均质玻璃海绵晶格结构的各向异性疲劳行为及多尺度破坏机制

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-06-03 DOI: 10.1016/j.ijfatigue.2025.109093

Meng He , Lei Yang , Chao Zhao , Ronghong Zhang , Danna Tang , Liang Hao

{"title":"Revealing anisotropic fatigue behavior and multiscale failure mechanisms of bio-inspired heterogeneous glass sponge lattice structures fabricated by laser powder bed fusion under high-cycle compression fatigue","authors":"Meng He , Lei Yang , Chao Zhao , Ronghong Zhang , Danna Tang , Liang Hao","doi":"10.1016/j.ijfatigue.2025.109093","DOIUrl":"10.1016/j.ijfatigue.2025.109093","url":null,"abstract":"<div><div>Lattice structures (LSs) fabricated via additive manufacturing (AM) are widely used for their lightweight, high strength-to-weight ratio, and energy absorption properties. However, the long-term fatigue performance of metallic lattice structures (MLSs) remains challenging, primarily due to structural failure and manufacturing defects. This study investigates the dynamic compressive fatigue behavior of bio-inspired glass sponge lattice structures (GSLSs) and their variants. Combining micro-CT characterization reveals a structure–property relationship where nodal geometry optimization improves fabrication quality and fatigue performance. Results show that GSLS achieves the highest fatigue strength (0.7 <span><math><mrow><msub><mi>F</mi><mrow><mi>max</mi></mrow></msub></mrow></math></span> = 17.897 kN) at 10<sup>4</sup> cycles, while GSLS-I exhibits the highest fatigue strength (<span><math><mrow><msub><mi>N</mi><mi>f</mi></msub></mrow></math></span>) at 10⁶ cycles (0.7 <span><math><mrow><msub><mi>F</mi><mrow><mi>max</mi></mrow></msub></mrow></math></span> = 11.827 kN). Meanwhile, failure mode analysis shows that stress concentrations at nodes and horizontal overhangs accelerate crack initiation, explaining the more excellent fatigue stability of GSLS, GSLS-II, and GSLS-S (R<sup>2</sup> = 0.99, 0.95, and 0.96) compared to GSLS-I and GSLS-III (R<sup>2</sup> = 0.69 and 0.76). Finite element analysis (FEA) further elucidates fatigue failure mechanisms, confirming cyclic ratcheting and strut-level stress distribution as key factors influencing fracture. This study provides a predictive framework for fatigue failure in MLSs and offers insights into optimizing high-performance LSs for aerospace, automotive, biomedical implants, and other engineering applications.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"200 ","pages":"Article 109093"},"PeriodicalIF":5.7,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213312","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}

引用次数: 0

A crystal plasticity finite element-based model for predicting the fatigue life of Cr-coated Zr4 alloy 基于晶体塑性有限元的cr包覆Zr4合金疲劳寿命预测模型

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-06-03 DOI: 10.1016/j.ijfatigue.2025.109091

Wenjie Zhang , Xianfeng Ma , Hailin Zhai, Baiming Yao, Ziyi Li, Jishen Jiang

{"title":"A crystal plasticity finite element-based model for predicting the fatigue life of Cr-coated Zr4 alloy","authors":"Wenjie Zhang , Xianfeng Ma , Hailin Zhai, Baiming Yao, Ziyi Li, Jishen Jiang","doi":"10.1016/j.ijfatigue.2025.109091","DOIUrl":"10.1016/j.ijfatigue.2025.109091","url":null,"abstract":"<div><div>The Cr-coated zirconium alloy has emerged as a leading candidate for accident-tolerant fuel (ATF) claddings in light-water nuclear reactors. However, experimental investigations have revealed that the application of Cr coating significantly reduces the fatigue life of Zr4 alloy at ambient temperature, posing a risk to the integrity of ATF claddings. To analyze the microscopic mechanism responsible for this fatigue degradation under cyclic loading, a crystal plasticity finite element model (CPFEM) is developed to explore the contrasting effects of Cr coating on the fatigue response of Zr4 substrate within uncracked and cracked regions. The cumulative plastic shear strain (p<sub>acc</sub>) is chosen as a fatigue indicator parameter (FIP) in this analysis. The findings indicate that in uncracked Cr-coated regions, the Cr layer effectively lowers p<sub>acc</sub> at the interface, which enhances fatigue resistance. Conversely, cracked regions significantly amplify local p<sub>acc</sub>, accelerating the nucleation and propagation of fatigue cracks. Utilizing CPFEM and a probabilistic method considering grain randomness, a fatigue life prediction model influenced by microstructural characteristics is developed for both uncoated and Cr-coated Zr4 alloy. Unlike the conventional grain-averaged FIP calculation method, the proposed model utilizes the concept of “crack-affected zone” to obtain more accurate evaluation in the detrimental impact of coating cracks on the fatigue life of Cr-coated Zr4 alloy.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"200 ","pages":"Article 109091"},"PeriodicalIF":5.7,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279592","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}

引用次数: 0

Suppressing crack growth and enhancing fatigue resistance in thin-wall high-pressure die-cast (HPDC) A380 alloy via friction stir processing 采用搅拌摩擦工艺抑制A380薄壁高压压铸合金裂纹扩展，提高其抗疲劳性能

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-06-02 DOI: 10.1016/j.ijfatigue.2025.109092

Avik Samanta , Nicole R. Overman , Kranthi Balusu , Hrishikesh Das , Ayoub Soulami , Glenn J. Grant , Saumyadeep Jana

{"title":"Suppressing crack growth and enhancing fatigue resistance in thin-wall high-pressure die-cast (HPDC) A380 alloy via friction stir processing","authors":"Avik Samanta , Nicole R. Overman , Kranthi Balusu , Hrishikesh Das , Ayoub Soulami , Glenn J. Grant , Saumyadeep Jana","doi":"10.1016/j.ijfatigue.2025.109092","DOIUrl":"10.1016/j.ijfatigue.2025.109092","url":null,"abstract":"<div><div>This research investigates the enhancement of fatigue life in thin-wall high-pressure die-cast (HPDC) hypoeutectic Al-Si alloy A380 through friction stir-based thermomechanical processing. The improvement is attributed to a shift in the fatigue crack propagation mode from transgranular to intergranular. Under a bending load configuration with a stress ratio of R = 0.1, friction stir processing (FSP) extends fatigue life by 5 to 15 times compared to the untreated HPDC A380 alloy, depending on the applied stress level. For the same stress level, FSP delays crack initiation by ∼ 25 times and reduces the crack propagation rate by ∼ 40 times compared to the HPDC condition. The post-FSP fatigue property enhancement is driven by porosity elimination, replacement of dendritic microstructure with a processed microstructure that exhibits Si and 2nd phases refinement and uniformity. Crack initiation sites for HPDC material are identified at microstructural defects such as porosity and Fe-Mn-containing particle/matrix interface, whereas crack initiates stochastically at the particle/matrix interface for FSPed material. Additionally, we highlight the transgranular propagation pathway of the HPDC, which proceeds continuously along and through the Al-Si eutectic and multiple second-phase particle compositions. In contrast, finely divided and refined second phases arrest the continuous intergranular crack propagation pathway under the FSP condition.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"200 ","pages":"Article 109092"},"PeriodicalIF":5.7,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221360","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}

引用次数: 0

Understanding the effect of Dynamic Strain Aging on Thermo-Mechanical Fatigue of a near-α Ti-alloy: A crystal-plasticity model framework 动态应变时效对近α钛合金热-机械疲劳的影响：晶体塑性模型框架

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-05-31 DOI: 10.1016/j.ijfatigue.2025.109067

Syed Mustafa Kazim , Kartik Prasad , Pritam Chakraborty

{"title":"Understanding the effect of Dynamic Strain Aging on Thermo-Mechanical Fatigue of a near-α Ti-alloy: A crystal-plasticity model framework","authors":"Syed Mustafa Kazim , Kartik Prasad , Pritam Chakraborty","doi":"10.1016/j.ijfatigue.2025.109067","DOIUrl":"10.1016/j.ijfatigue.2025.109067","url":null,"abstract":"<div><div>Timetal 834, a near-<span><math><mi>α</mi></math></span> Titanium alloy, is a candidate material for high pressure compressor blisks of aero-engines. The alloy is expected to experience Thermo-Mechanical Fatigue (TMF) loading during operation, which can reduce its design life. The effect can be exacerbated by Dynamic Strain Aging (DSA) which is observed in this alloy within the operational temperature range. In this work, a crystal plasticity model is developed that incorporates the micro-mechanism of DSA to understand its influence on the TMF response in the <span><math><mi>α</mi></math></span>-grains, the <span><math><mi>α</mi></math></span> and <span><math><mi>β</mi></math></span> laths in colonies, and representative volume elements of this alloy. Simulations are performed for In-Phase (IP) and Out-of-Phase (OP) TMF loadings for temperature intervals of 300–450 °C and 450–600 °C consistent with experimental conditions. The results show that the model is able to capture the mean stress evolution for OP and IP TMFs, as well as the transition of peak stress from softening to hardening with cycles, as observed in experiments. Comparison of simulated responses with and without DSA, clearly reveals that the transition from softening to hardening of peak stress during TMF is caused by DSA. This inference is also supported by serrations observed in certain segments of the hysteresis loop, signifying the occurrence of DSA.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"200 ","pages":"Article 109067"},"PeriodicalIF":5.7,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204676","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}

引用次数: 0

Modeling the effect of TiN inclusion on fatigue lives of high-strength steel 模拟TiN夹杂物对高强钢疲劳寿命的影响

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-05-31 DOI: 10.1016/j.ijfatigue.2025.109090

Zikuan Xu , Peng Wang , Yichunxiang Shen , Peng Zhang , Bin Wang , Ziheng Shao , Zhefeng Zhang

{"title":"Modeling the effect of TiN inclusion on fatigue lives of high-strength steel","authors":"Zikuan Xu , Peng Wang , Yichunxiang Shen , Peng Zhang , Bin Wang , Ziheng Shao , Zhefeng Zhang","doi":"10.1016/j.ijfatigue.2025.109090","DOIUrl":"10.1016/j.ijfatigue.2025.109090","url":null,"abstract":"<div><div>In the present study, variability in high-cycle fatigue lives has been studied in AISI 52100 high-strength steel containing TiN inclusions at two heat treatment states. It is found that the spatial orientations of TiN inclusions in the samples are randomly distributed, and have no significant effect on their cracking behavior under cyclic stress. All the examined samples revealed that the fracture planes of TiN inclusion are approximately vertical to the loading axis. Accordingly, a fatigue life prediction model is proposed by taking into account the cracking behaviors of TiN inclusions, ultimately reducing the prediction error of fatigue lives to within 2.5 times of the experimental values. The model demonstrates that the size and shape of TiN inclusions significantly affect fatigue lives of the samples. Specifically, TiN inclusions in samples with longer fatigue life either has a small area perpendicular to the loading direction or is thin parallel to the loading direction. Overall, the comprehensive results regarding the effect of TiN inclusions on fatigue life highlight the strategies to minimize uncertainty in fatigue life predictions for high-strength steels.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"200 ","pages":"Article 109090"},"PeriodicalIF":5.7,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212705","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}

引用次数: 0

High-cycle fatigue behavior of ultra-thin Ag interconnectors in GaAs cell arrays for deep space exploration: temperature cycling and impact of wind and dust particles 深空探测用砷化镓电池阵列中超薄银互连体的高周疲劳行为：温度循环和风尘颗粒的影响

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-05-30 DOI: 10.1016/j.ijfatigue.2025.109087

Ming-Yuan Zhang , Xue-Mei Luo , Zhi-Bin Wang , Bing-Li Hu , Fu-Lai Cheng , Qi Gao , Hao Wang , Guang-Ping Zhang

{"title":"High-cycle fatigue behavior of ultra-thin Ag interconnectors in GaAs cell arrays for deep space exploration: temperature cycling and impact of wind and dust particles","authors":"Ming-Yuan Zhang , Xue-Mei Luo , Zhi-Bin Wang , Bing-Li Hu , Fu-Lai Cheng , Qi Gao , Hao Wang , Guang-Ping Zhang","doi":"10.1016/j.ijfatigue.2025.109087","DOIUrl":"10.1016/j.ijfatigue.2025.109087","url":null,"abstract":"<div><div>The ultra-thin Ag interconnectors used for GaAs solar cell arrays applications face numerous challenges in deep space exploration missions, such as extreme temperature variations and the impact of wind and dust particles. In this study, finite element analysis was employed to investigate the effects of temperature cycling, as well as the impact of wind and dust particles. These analyses helped identify the loading modes of the GaAs cell Ag interconnectors with stress relief loops, specifically tensile-tensile fatigue and dynamic bending fatigue, and locate high-risk sites for potential failure. Subsequently, the fatigue damage behaviors of the ultra-thin Ag interconnector foils under tensile-tensile and dynamic bending fatigue tests were carefully examined. Finally, fatigue life at high-risk failure sites was quantitatively estimated based on the experimental fatigue data. The findings would have important implications for understanding fatigue damage behavior of micron-scale metal interconnector foils and for engineering design of GaAs solar cell interconnectors with long-term fatigue reliability in hash space environments.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109087"},"PeriodicalIF":5.7,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178369","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}

引用次数: 0

Fatigue life prediction of composite laminates based on energy conservation and damage entropy accumulation 基于能量守恒和损伤熵累积的复合材料层合板疲劳寿命预测

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-05-29 DOI: 10.1016/j.ijfatigue.2025.109088

Yalin Han , Fuqiang Wu , Yuhao Lian

{"title":"Fatigue life prediction of composite laminates based on energy conservation and damage entropy accumulation","authors":"Yalin Han , Fuqiang Wu , Yuhao Lian","doi":"10.1016/j.ijfatigue.2025.109088","DOIUrl":"10.1016/j.ijfatigue.2025.109088","url":null,"abstract":"<div><div>Fatigue is an irreversible thermodynamic process accompanied by multi-component energy dissipation and entropy accumulation. This study analyzes the energy composition of total mechanical input hysteresis energy during the fatigue process of composites. By excluding thermal dissipation and viscoelastic internal friction dissipation energy, which do not directly contribute to fatigue damage, the irrecoverable damage energy is extracted. This portion of energy is closely related to the final failure of the specimen and the accumulation of damage entropy. The differences in energy dissipation mechanisms between low-cycle and high-cycle fatigue are evaluated, and a fatigue life prediction model for composites is established based on different damage entropy thresholds. Fatigue tests were conducted on glass fiber-reinforced polymer (GFRP) composite laminates, and the fatigue properties were investigated using infrared thermography (IRT) and digital image correlation (DIC). The proposed damage entropy model for fatigue life prediction was validated at various loading frequencies (2–5 Hz) and across a wide range of cycles (10<sup>2</sup>-10<sup>6</sup> cycles), showing good agreement with the experimental results.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109088"},"PeriodicalIF":5.7,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184342","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}

引用次数: 0

The influence of process parameters and building orientation on fracture toughness and fatigue crack growth behavior of laser powder bed fused tantalum 工艺参数和构建方向对激光粉末床熔敷钽断裂韧性和疲劳裂纹扩展行为的影响

IF 5.7 2区材料科学

International Journal of Fatigue Pub Date : 2025-05-29 DOI: 10.1016/j.ijfatigue.2025.109086

Rongzheng Huang , Wenling Shi , Kuixue Xu , Rong Wang , Haiqiong Xie , Kai Wei

{"title":"The influence of process parameters and building orientation on fracture toughness and fatigue crack growth behavior of laser powder bed fused tantalum","authors":"Rongzheng Huang , Wenling Shi , Kuixue Xu , Rong Wang , Haiqiong Xie , Kai Wei","doi":"10.1016/j.ijfatigue.2025.109086","DOIUrl":"10.1016/j.ijfatigue.2025.109086","url":null,"abstract":"<div><div>Laser powder bed fused tantalum (LPBF-Ta) is a burgeoning biometal for application in personalized orthopedic implants. However, the effects of process parameters and building orientation on fracture toughness and fatigue crack growth behavior remain to be elucidated. In this study, LPBF-Ta with superior crack resistance was fabricated by optimizing laser energy density and building orientation, and the underlying strengthening and failure mechanisms were revealed. The experimental results indicate that the optimal fracture toughness of 77.4 MPa∙m<sup>1/2</sup> and the lowest fatigue crack growth rate were obtained in samples built along the XY orientation at a laser energy density of 154.16 J/mm<sup>3</sup>. Superior plastic deformation capabilities lead to crack tip blunting, and localized fracture regions along the boundaries of cellular structures facilitate crack branching and deflection, synergistically contributing to the excellent fracture toughness. Besides, high-angle grain boundaries, triple junctions, cellular blocks, and dislocation networks collectively impede dislocation mobility, thereby resulting in a reduced fatigue crack growth rate. Conversely, samples built along the ZX orientation at identical laser energy density demonstrated superior fatigue crack growth threshold. The elevated threshold is primarily attributed to the slip mismatch between adjacent grains and the roughness-dominated crack closure effect.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109086"},"PeriodicalIF":5.7,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189389","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}

引用次数: 0