Article
Materials Science, Multidisciplinary
Daliang Yu, Wen Yang, Wanqing Deng, Songzhu Zhu, Qingwei Dai, Dingfei Zhang
Summary: This study investigated the hot tearing mechanisms in Aluminum (Al) parts with complex structures using optical microscope, scanning electron microscope, energy dispersive spectrometer, and finite difference method. Shrinkage porosities and cracked brittle Fe-bearing phases were found in the casted specimens, with improper solidification sequence contributing to crack initiation in the engine. Numerical simulation supported the observation of microstructure, suggesting that solidification sequence promoted casting defects.
Article
Engineering, Mechanical
Zilu Xu, Chaowen Huang, Mingpan Wan, Changsheng Tan, Yongqing Zhao, Shengli Ji, Weidong Zeng
Summary: This study comparatively investigated the crack initiation and propagation behavior of Ti-55531 alloy with lamellar and bimodal microstructures under low cycle fatigue. Results showed that the two microstructures exhibited significant differences in cyclic deformation and fatigue behavior due to their different sensitivities to cyclic strain. Additionally, stacking faults were identified as another important mechanism for crack nucleation at the alpha(s)/beta interface of Ti alloys.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Zhong Zhang, Chaowen Huang, Zilu Xu, Jiang Yang, Shaolei Long, Changsheng Tan, Mingpan Wan, Dan Liu, Shengli Ji, Weidong Zeng
Summary: The high cycle fatigue (HCF) properties and microcrack initiation behavior of Ti-55531 alloy with a multilevel lamellar microstructure under various notch radii were systematically investigated. The reduction of notch root radius significantly promotes fatigue microcrack initiation, and then dramatically reduces the HCF life and strength of the alloy. The cyclic deformation of the alloy is mainly controlled by the slipping and deformation twinning in plates, and the primary fatigue crack initiation micro-mechanism is a/b interface cracking induced by slipping and twinning at all notch HCF specimens.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Jingyu Sun, Guian Qian, Jianghua Li, Ruiyang Li, Zhimo Jian, Youshi Hong, Filippo Berto
Summary: Currently, there is no systematic approach to simulate the microstructure sensitive crack initiation and propagation process in very-high-cycle fatigue. In this study, a computational framework combining crystal plasticity and cohesive zone model is developed to simulate the defect-induced short crack growth in an additively manufactured AlSi10Mg alloy. The framework can control the crack growth rate and the proportion of crack initiation damage in the total damage. An acceleration strategy is proposed to improve the computational efficiency for very-high-cycle fatigue. Experimental observations and simulation results show good agreement.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
Guo-Qin Sun, Dong-Yue Zhu, Shu-Jun Chen, Zhan-Feng Deng, Wei Kang, De-Guang Shang
Summary: The fatigue initiation and propagation behavior of wire arc additive manufactured Al-Mg alloy in aerospace structures was investigated. Multiple crack initiation was observed with small cracks distributed in the deposition and layer band zones. The main crack originated from the coarse columnar grain boundaries and final fracture occurred in the strain concentration zone. Fatigue fractures showed initiation at pores, non-melted particles, and grain boundaries.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Zhong Zhang, Chaowen Huang, Sinuo Chen, Mingpan Wan, Ming Yang, Shengli Ji, Weidong Zeng
Summary: This paper studied the high cycle fatigue (HCF) of a high strength novel 211Z.X aluminum alloy. The fine and dispersive distribution of the second phases improved the strength of the alloy, and the formation of short-bar and spherical precipitates promoted coordinated deformation, resulting in better HCF properties.
Article
Materials Science, Multidisciplinary
Hang Zhou, Zheng Zhang
Summary: Low-cycle fatigue tests were conducted to investigate fatigue crack initiation and early propagation behavior under mechanical cyclic and thermal cyclic loadings. Metallographic and scanning electron microscopy (SEM) were used for analysis. The damage mode of silicon particles plays a significant role in crack behavior, with cracks induced by fractured particles in mechanical fatigue and debonded particles in thermal fatigue. The initiation of cracks varies depending on the particle morphology, while the subsequent coalescence of microcracks is primarily controlled by the brittle fracture of particles. The broken sequence of particles is crucial during the early propagation stage of fatigue crack.
Article
Nanoscience & Nanotechnology
Xiaolu Gui, Guhui Gao, Baifeng An, R. D. K. Misra, Bingzhe Bai
Summary: The study investigated the effects of inclusion size and microstructural features on HCF/VHCF in a B/M steel. It was found that fatigue crack initiation was mainly influenced by inclusions, with the majority of fatigue life consumed by the crack initiation process regardless of the source of the crack. The ratio of fatigue crack initiation life to total fatigue life exhibited a wide scatter due to variations in the B/M hierarchical structure within individual prior austenite grains when cracks initiated from sub-surface microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Takayuki Shiraiwa, Fabien Briffod, Manabu Enoki
Summary: A method for predicting fatigue crack initiation of the 7075 aluminum alloy by crystal plasticity finite element analysis considering microstructures was proposed in this study. The calculated crack initiation life and morphology were in good agreement with the experimental results, indicating the effectiveness of the proposed method in predicting fatigue crack initiation in aluminum alloys.
Article
Nanoscience & Nanotechnology
Yoshikazu Nakai, Shoichi Kikuchi, Kaito Asayama, Hayata Yoshida
Summary: The research revealed that twinning occurs under compressive stress, while detwinning only happens under tensile stress. Compression-compression fatigue tests can lead to continuous twinning, changing grain orientation and causing crack formation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Zhihong Wu, Hongchao Kou, Jinshan Li, Nana Chen, Zhicheng Xi, Fan Sun, Frederic Prima
Summary: In this study, low-cycle fatigue tests were conducted on the dual phase titanium alloy Ti-5Al-7.5V at room temperature to investigate the deformation mechanisms and crack initiation. It was found that planar dislocation slip, localized at the basal and prismatic planes of the alpha phase, was the primary deformation mode. Multiple slips occurred simultaneously within a single grain. Microcracks were observed along the basal slip bands, but were confined within the primary alpha grains without propagating to the surrounding transformed beta matrix. The presence of silicides in contact with the microcracks and slip bands did not lead to crack initiation. It remains unclear whether the silicides can act as dislocation sources for planar slips and facilitate crack nucleation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Yuna Wu, Hengcheng Liao, Yunyi Tang
Summary: This study investigated the high-cycle fatigue behavior of Al-Si alloys under different conditions and found that the fatigue strength of the alloy is lower at 350 degrees C with different fatigue crack origins. Additionally, the study showed that at high temperatures, the hardness and reduced modulus of the Al15Mn3Si2 phase are higher, making cracks more likely to initiate and propagate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Noelle Easter C. Co, James T. Burns
Summary: The fatigue resistance of aerospace structures is affected by corrosion damage. The formation of fatigue cracks is influenced by the micro-scale corrosion morphologies and underlying microstructure. A modest correlation was found between the initiation of fatigue cracks and grains with high misorientation angles with respect to adjacent grains.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Chemistry, Multidisciplinary
Gaoge Xue, Takashi Nakamura, Nao Fujimura, Kosuke Takahashi, Hiroyuki Oguma
Summary: Uniaxial fatigue tests were conducted on a beta titanium alloy Ti-22V-4Al up to a very high cycle fatigue (VHCF) regime, studying the initiation and propagation processes of internal fatigue cracks. Three facet initiation models were proposed, with the major facet being determined as the true crack initiation site. By applying a Tanaka-Akiniwa model, the material constants for the Paris law were determined using conventional fatigue tests, showing that the formation of multiple facets in beta titanium alloys is sequential rather than simultaneous.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Mei Zhang, Zijie Yan, Bendao Zhang, Qing Xu, Qiaosheng Shen, Henghua Zhang
Summary: The LCF behavior of a T6-treated low silicon cast aluminum alloy Al-3.5Si-0.5Mg-0.4Cu was studied under axial symmetric tension-compression cyclic loading conditions. The study included the LCF behavior and experimental results under 6 different total strain amplitudes ranging from 0.25% to 0.5%. OM, SEM, XRD, and TEM were employed to observe and analyze the fracture morphology and microstructure evolution. The results showed that cracks were initiated from surface or subsurface defects. A higher total strain amplitude resulted in a smaller sum area of fatigue crack initiation region, a steady crack propagation regime, and a larger fatigue striation bandwidth. Furthermore, the crack propagated along the interface between eutectic silicon and α-Al matrix under lower strain amplitudes, while it extended through eutectic silicon particles under higher strain amplitudes.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Sebastien Dezecot, Jean-Yves Buffiere, Alain Koster, Vincent Maurel, Fabien Szmytka, Eric Charkaluk, Nora Dahdah, Ahmed El Bartali, Nathalie Limodin, Jean-Francois Witz
SCRIPTA MATERIALIA
(2016)
Article
Nanoscience & Nanotechnology
Sebastien Dezecot, Matthieu Rambaudon, Alain Koster, Fabien Szmytka, Vincent Maurel, Jean-Yves Buffiere
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Engineering, Mechanical
Vincent Maurel, Vincent Chiaruttini, Manon Abecassis, Alain Koster, Sebastien Dezecot
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2020)
Article
Materials Science, Multidisciplinary
Sebastien Dezecot, Vincent Maurel, Jean-Yves Buffiere, Fabien Szmytka, Alain Koster
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)
