Article
Materials Science, Multidisciplinary
C. Lavogiez, C. Dureau, Y. Nadot, P. Villechaise, S. Hemery
Summary: The fatigue behavior of Ti-6Al-4V with a bi-modal microstructure was investigated using different waveforms, load ratios, and frequencies. It was found that cracks were initiated along (0001) twist grain boundaries, which is consistent with prior studies. The results also showed that the critical microstructural configurations were not sensitive to environmental factors, free surfaces, loading conditions, and microstructure and composition.
Article
Engineering, Mechanical
Adrienne Muth, Reji John, Adam Pilchak, Surya R. Kalidindi, David L. McDowell
Summary: This study examines the use of Fatigue Indicator Parameters (FIPs) in Ti-6Al-4V, showing that fatigue crack formation is predominantly influenced by alpha-phase grains in the High Cycle Fatigue (HCF) regime.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Daniel Suarez Fernandez, B. P. Wynne, P. Crawforth, K. Fox, M. Jackson
Summary: The study on fatigue failure mechanisms of Ti-6Al-2Sn-4Zr-6Mo forged discs revealed that the heterogeneous crystallographic texture developed during upstream forging affects fatigue performance. Downstream machining processes were found to improve fatigue life, despite the presence of circumferential fatigue heterogeneity.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Zhihong Wu, Hongchao Kou, Nana Chen, Zhixin Zhang, Fengming Qiang, Jiangkun Fan, Bin Tang, Jinshan Li
Summary: The study investigated the effect of microstructure features on the high-cycle fatigue behavior of Ti-7Mo-3Nb-3Cr-3Al (Ti-7333) alloy. It was found that fatigue strength is closely related to microstructure features, especially the alpha(p) percentage. The alloy with lower alpha(p) percentage exhibited higher scatter in fatigue data and bimodal fatigue behavior.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Mechanical
S. Hemery, J. C. Stinville
Summary: This study monitored the microstructurally small crack growth in Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo with equiaxed and bimodal microstructures. The influence of microstructure on the lifetime variability observed in Ti alloys was evaluated, and primary alpha grains, basal plane cracking, and misalignment across boundaries were identified as key features for high crack growth rates. Dwell periods were found to induce significant small crack acceleration.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Dingcheng Tang, Xiaofan He, Bin Wu, Xiaobo Wang, Tianshuai Wang, Yuhai Li
Summary: This study investigates the mid-cycle fatigue behavior of as-built DED Ti-6Al-4V and its influencing factors. The study finds that internal pore initiation is a common mode for crack formation, involving a combination of cleavage and intergranular fracture. The quantitative development of a pore size classification method helps elucidate the relationships among microstructure, pore size, fatigue behavior, and fatigue crack growth stages.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Kai Zhang, Ying Liu, Xinni Tian, Yi Yang, Yuman Zhu, Michael Bermingham, Aijun Huang
Summary: This study investigates the high-cycle fatigue life and crack propagation rates of laser direct energy deposited Ti-6Al-4V with a trace boron addition. The refined microstructure increases crack initiation resistance and significantly improves high-cycle fatigue life. However, the crack propagation resistance, estimated from spectrum loading, is reduced due to the refined prior-beta grains and TiB particles.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Physical
Chengyi Dan, Yuchi Cui, Yi Wu, Zhe Chen, Hui Liu, Gang Ji, Yakai Xiao, Han Chen, Mingliang Wang, Jun Liu, Lei Wang, Yang Li, Ahmed Addad, Ying Zhou, Siming Ma, Qiwei Shi, Haowei Wang, Jian Lu
Summary: A fatigue resistance phenomenon has been observed in nano-TiB2-decorated AlSi10Mg alloy produced by additive manufacturing. The three-dimensional dual-phase cellular nanostructure of this alloy acts as a volumetric nanocage, preventing localized damage accumulation and fatigue crack initiation. The fatigue strength of this alloy is close to its tensile strength and surpasses that of other additive manufacturing Al alloys and high-strength wrought Al alloys.
Article
Chemistry, Physical
Mojtaba Najafizadeh, Ashkan Bahadoran, Mansoor Bozorg, Behzad Sadeghi, Jiamiao Liang, Deliang Zhang
Summary: The study found that the Al content and heat treatment significantly affected the microstructures and mechanical properties of Ti-XAl-2Fe-3Cu alloys. Increasing Al content reduced the average lamellar colony size and thickness of the alloy, while heat treatment increased lamellar thickness and partitioning of Fe and Cu. Increasing Al content slightly increased the strength without changing ductility, while heat treatment slightly reduced strength but increased tensile ductility of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Wenhao Cheng, Hongbing Liu, Jie Tan, Zhishui Yu, Qingrong Shu
Summary: This paper conducted microstructure analysis and performance research on dual laser beam welded 2060-T8/2099-T83 aluminum-lithium alloys. The study found that weld heat input significantly affects the penetration of the welded joint, with high laser power leading to increased penetration. Pore defects do not have a clear rule on the tensile strength of the weld, but they do affect fatigue life.
Article
Materials Science, Multidisciplinary
Naomi Piera Bellomo, Irem Oeztuerk, Michael Guenzel, Rachel Reed, Veeraraghavan Sundar, Amine Ammar, Caspar Schwalbe
Summary: An approach combining automation and simulation is proposed to accurately predict and analyze casting porosity. The study reveals a proportionality factor of 2.9 between pore size and critical pore size, consistent with the clusters of critical pore sizes calculated from 2D and 3D datasets. The simulated casting porosity is compared to the measured porosity on cast blades in critical regions, and the predictive accuracy is discussed in detail.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Engineering, Mechanical
I. J. Wietecha-Reiman, A. Segall, X. Zhao, T. A. Palmer
Summary: A tool based on fractal and topological techniques using image analysis has been developed to accurately characterize fracture modes and crack initiation locations. This tool quantifies feature complexity, heterogeneity, and connectivity through fractal dimensions, lacunarity, and topology measurements. It was validated on complex fatigue fractures in Ti-6Al-4V, easily differentiating fracture initiation sites and fracture modes.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Abdul Khadar Syed, Rob Plaskitt, Michelle Hill, Zsolt Pinter, Jialuo Ding, Robert Zboray, Stewart Williams, Xiang Zhang
Summary: This paper investigates the cyclic deformation behavior and fatigue properties of a wire + arc additive manufactured Ti-6Al-4V alloy. Compared to Ti-6Al-4V alloys produced by other additive manufacturing processes, the material used in this study has a coarser primary columnar beta grain structure and alpha microstructure. Fatigue tests were conducted on specimens with horizontal and vertical orientations. The vertical samples, where the loading axis was parallel with the primary columnar beta grains, showed slightly higher fatigue life and a higher cyclic softening rate compared to the horizontal samples. No porosity defects were found, and cracks initiated from either the alpha laths or alpha/beta interface due to cyclic slip localization.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Yipeng Chen, Weiwen Kong, Chao Yuan, Shuai Liu, Yong Cai, Yongqiang Wang, Xinyu Gao
Summary: The high-cycle fatigue behavior of wrought superalloy GH4742 was investigated at room temperature, 650 degrees C, and 750 degrees C. The fatigue strength at 107 cycles increases with temperature due to different fracture modes. Fatigue cracks originate from the specimen surface at room temperature, while at higher temperatures they originate from subsurface or internal crystallographic planes. The dislocation density and deformation mechanisms vary with temperature, involving APBs shearing, Orowan bypassing, and stacking faults shearing.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
Hang Lv, Zhenlin Zhang, Yarong Chen, Yan Liu, Hui Chen, Yong Chen, Jing Cheng, Jian She, Huabing He, Jintao Chen
Summary: In this study, several large Ti-6Al-4V blocks were fabricated successfully using high-power laser metal deposition (HP-LMD). The high cycle fatigue (HCF) property and fatigue crack growth (FCG) behavior of the as-built Ti-6Al-4V alloy were investigated in horizontal and vertical directions. The results showed that the HCF performance of the vertical specimens was superior to the horizontal specimens, but inferior to the wrought Ti-6Al-4V. Additionally, the fatigue crack growth rate of the vertical specimens was lower than that of the horizontal specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Miloslav Kepka, Miloslav Kepka Jr, Radovan Minich
Summary: This paper focuses on the fatigue life evaluation of the bodywork of a new articulated electric (battery) bus. The findings resulted in recommendations to improve the operational reliability of a particular vehicle and provided challenges for future research.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
T. Dusautoir, B. Berthel, S. Fouvry, P. Matzen, K-D. Meck
Summary: This study investigates the impact of post-processing treatments on the fatigue limit of additive manufactured Ti-6Al-4V under stress gradients, with a focus on surface integrity.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Zhuofan Xia, Di Wu, Xiaochen Zhang, Jianqiu Wang, En -Hou Han
Summary: The study reveals the surface-initiated rolling contact fatigue (RCF) failure mechanism under heavy load and initial high roughness surface. The results indicate that precursor of collapsed morphology and nanocrystalline layer are the main factors causing lower RCF life with high roughness compared to low roughness surfaces. The spalling failure initiating from low roughness surface under heavy load is strongly dependent on surface plastic deformation.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Daniel Gren, Knut Andreas Meyer
Summary: Rolling contact loading can cause plastic deformation and fatigue cracks. Current rail standards do not consider the effect of plasticity on mechanical behavior. This study proposes a new method for evaluating the fatigue life of deformed material and finds that superimposed compressive axial loads can increase fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
R. Kumar, S. Sanyal, J. Bhagyaraj, E. Hari Krishna, S. Mukherjee, K. Prasad, S. Mandal
Summary: This study investigates the thermomechanical fatigue (TMF) behavior of Timetal 834 alloy under different loading conditions. The results show that the alloy exhibits different cyclic hardening and softening responses at different strain amplitudes. The strain amplitude and phase angle have significant effects on the TMF life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Kai Donnerbauer, Tobias Bill, Peter Starke, Ruth Acosta, Bharath Yerrapa, Christian Boller, Klaus Heckmann, Frank Walther
Summary: Given the aging of nuclear power plants, it is important to develop methods for evaluating the integrity of components and structures in nuclear engineering. Suitable nondestructive testing methods can detect material degradation and determine its fatigue life. This study utilized various NDT parameters and scanning electron microscopic methods to explore the relationship between microstructure evolution and NDT data.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Liuyong He, Jiang Zheng, Tianjiao Li, Houkun Zhou, Lihong Xia, Bin Jiang
Summary: This study quantitatively analyzed the effects of precipitates on the deformation mode, cracking mode, and mechanical behavior of WE54 magnesium alloy during low-cycle fatigue. It was found that precipitates promoted the activation of dislocation slip and suppressed the activation of twinning, affecting the cracking mode and mechanical behavior.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Xiangkang Zeng, Conghui Zhang, Wenguang Zhu, Mingliang Zhu, Tongguang Zhai, Xiaomei He, Kangkai Song, Zhuohang Xie
Summary: The cyclic deformation behaviors and damage mechanisms of pure Zr were investigated. The cyclic stress response was mainly influenced by substructure evolutions. Prismatic < a > dislocation slip was identified as the dominant deformation mechanism. Fatigue damage was not only influenced by the initial texture, but also other factors.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Jingyu Yang, Bingbing Li, Yiming Zheng, Gang Chen, Xu Chen
Summary: Heat treatment is used to improve the low-cycle fatigue performance of additive manufactured 316LN stainless steel. The heat-treated material demonstrates initially cyclic hardening followed by softening behavior, and shows a stronger resistance to crack propagation compared to the as-built material, resulting in a longer fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Lang Zou, Dongfang Zeng, Xiong Chen, Jun Li, Hai Zhao, Liantao Lu
Summary: This study investigates the competitive relationship between fretting fatigue and plain fatigue in press-fitted railway axles. By changing the depth of the stress relief groove, the plain fatigue limit and fretting fatigue strength were tested. Detailed information was gathered, and an evaluation methodology integrating finite element simulation and the Modified Wohler Curve Method was established. The study concludes that the optimal groove depth, which balances the anti-fatigue capabilities, depends on the number of test cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Davide Leonetti, Koji Kinoshita, Yukina Takai, Alain Nussbaumer
Summary: This paper investigates the fatigue behavior of non-load-carrying transverse welded steel attachments, including fatigue crack monitoring and fracture surface analysis under constant and variable amplitude loading. A procedure is proposed to obtain a Markov transition matrix based on the measured strain signal and to randomly resample the stress history for variable amplitude fatigue tests.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Zhe Zhang, Bing Yang, Yuedong Wang, Shoune Xiao
Summary: This paper presents a method for designing fatigue life prediction models with small sample sizes by handling limited sample data. The method integrates the equivalent structural stress method with the maximum likelihood estimation method and adds reliability verification, resulting in enhanced goodness of fit, stability, and optimized sample quantity.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Cooper K. Hansen, Gary F. Whelan, Jacob D. Hochhalter
Summary: This paper presents a method to address the computational demand issue of computing FIPs using CPFEM by developing an interpretable machine learning model. Genetic programming is used to evolve interpretable expressions of FIPs from microstructure features, and these models can serve as efficient substitutes for CPFEM and be easily integrated into engineering workflows.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Luca Susmel
Summary: This paper discusses the problem of estimating notch fatigue limits using machine learning. The results show that machine learning is a promising approach for designing notched components against fatigue. The accuracy in estimating the fatigue limit can be increased by increasing the size and quality of the calibration dataset, as well as including additional input features.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Kefeng Gao, Guoqi Tan, Yanyan Liu, Qiang Wang, Qian Tang, Xuegang Wang, Qiqiang Duan, Zengqian Liu, Zhe Yi, Zhefeng Zhang
Summary: Bioinspired architectures have significant effects on material enhancement. This study investigates the fatigue properties of bioinspired ceramic-polymer composites and natural nacre, revealing the close relationship between architectural types, orientations, fatigue performance, and damage mechanisms.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)