Article
Materials Science, Ceramics
Geng Hou, De-Guang Shang, Lin-Xuan Zuo, Lin-Feng Qu, Ming Xia, Shao-Dong Wu, Xiang Yin, Chao -Lin Chen
Summary: Based on the calculation of macroscopic elastic constants and stress concentration factors, the fatigue notch factors of needled C/SiC ceramic matrix composite were determined using fatigue test data. A relationship between the fatigue notch factor and stress concentration factor was established, and a fatigue life prediction method for the central hole of the composite was proposed. The proposed method showed better accuracy in predicting the fatigue life of the central hole specimen.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Shao-Dong Wu, De -Guang Shang, Lin-Xuan Zuo, Lin-Feng Qu, Song -Guang Wang, Geng Hou, Guo-Cheng Hao
Summary: This study designed a plate specimen with arc notch to study the properties of needled C/SiC composite under random vibration loading. Random vibration tests were conducted and the vibration fatigue life and vibration response signal at the dangerous position of each specimen were obtained. The strain amplitude probability distribution of the vibration response signal was approximately described by the Dirlik distribution. The attenuation history curve of the specimen's natural frequency showed obvious nonlinearity, and the microscopic fracture morphology of failed specimens revealed different failure modes of fibers.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Geng Hou, De-Guang Shang, Lin-Xuan Zuo, Lin-Feng Qu, Ming Xia, Shao-Dong Wu, Xiang Yin
Summary: An applied approach for predicting the fatigue life of the through-hole for needled ceramic matrix composite, using the 0 degrees layers volume fraction and the fatigue notch factor, was proposed. This method can accurately predict the fatigue life of the through-hole in needled composites with different lamination types.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Fei Wang, Xuefeng Teng, Yun Jiang, Xiaoan Hu, Minghui Lu, Xiaojun Guo, Xiaochong Liu, Xin Liu, Duokui Yu
Summary: This paper investigates the tension-tension fatigue behavior of continuous fiber-reinforced ceramic matrix composites (CMCs) and studies the damage accumulation and evolution process using the acoustic emission (AE) method. The results show that the material exhibits obvious hysteresis behavior and is affected by interfacial slip and wear mechanisms. Most of the fibers have high strength and excellent toughening property.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Geng Hou, De-Guang Shang, Lin-Xuan Zuo, Lin-Feng Qu, Yi-Er Guo, Ming Xia, Shao-Dong Wu, Xiang Yin
Summary: This study monitored the fatigue damage process of SiC coated needled C/SiC composite specimen under tension-tension cyclic loading using acoustic emission (AE), revealing an enhancement of the Kaiser effect with increasing stable cycles. Cluster analysis of AE parameters identified four damage modes, providing insight into the characteristics of AE parameters at different damage stages. Additionally, the fracture morphology of the specimen was observed using scanning electron microscopy after fatigue fracture.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Dezheng Yin, Yangfang Deng, Yuzhao Ma, Xiaomeng Fan
Summary: This study investigated the mechanical behavior of a C/SiC composite with varying SiC matrix content. It was found that as the SiC matrix content increased, the flexural strength and fracture toughness of the composite sharply improved. The infiltration ability of the SiC matrix and its distribution within the composite influenced the mechanical properties.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Shao-Dong Wu, De-Guang Shang, Lin-Xuan Zuo, Lin-Feng Qu, Geng Hou, Guo-Cheng Hao, Feng-Tian Shi
Summary: The experimental results demonstrate the nonlinear stiffness characteristics of needled C/SiC composite during vibration. A proposed S-N curve associated with the number of 0 degrees layer fibers is introduced to account for the influence of fiber layer on fatigue properties. By analyzing the relationship between frequency response curve and signal strength, an amplitude probability density function is proposed to predict the fatigue life of notched plate specimen under narrow band random vibrations, which shows a good prediction effect.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Geng Hou, De-Guang Shang, Lin-Xuan Zuo, Lin-Feng Qu, Ming Xia, Yi-Er Guo, Xiang Yin, Shao-Dong Wu
Summary: The fatigue test of a needled C/SiC composite with a notch under tension-tension cyclic loading was completed, and the main fatigue crack propagation curve of the needled composite was obtained through in situ observation. By analyzing the influence of failure number and distribution on the tensile loading of 0 degrees fiber bundles, the relationship between main fatigue crack propagation and the distribution of 0 degrees fiber bundles in the needled composite was established. The reasons for the varying fatigue resistance of different notched specimens were also explained by observing the fracture microstructure, especially the distribution of 0 degrees fiber bundles, through scanning electron microscopy. In addition, acoustic emission (AE) was used to analyze the AE energy characteristics during the fatigue crack propagation process of the needled composite.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Review
Materials Science, Multidisciplinary
Yahiya Ahmed Kedir, Hirpa G. Lemu
Summary: Metallic materials are widely used in engineering constructions, and fatigue failure is a common failure mechanism in metals. Despite being studied for almost 160 years, many problems in metal fatigue remain unsolved. Fatigue occurs in metals when they are subjected to varying loads, leading to failure due to accumulation of damage. The fatigue process involves damage buildup, crack initiation, and crack growth until reaching the critical flaw size. Various prediction models have been developed to understand and predict the fatigue phenomenon, including microstructure scale parameters and different approaches for life prediction. This paper reviews these models and identifies gaps in knowledge about predicting fatigue crack initiation under variable loading at high temperatures.
Article
Engineering, Mechanical
I. M. Matos, J. A. Araujo, F. C. Castro
Summary: In this study, vibration data from a transmission line in the center-west region of Brazil was used to perform fretting fatigue tests on aluminum alloy wires. Two different methodologies for life prediction were applied to variable amplitude loading conditions, and the agreement between measured and predicted lives indicated their usefulness for fatigue analysis of overhead conductors.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Ensheng Feng, Xiaogang Wang, Chao Jiang, Vincenzo Crupi
Summary: This study advances the QTM approach for predicting the fatigue life under variable amplitude loading in both low and high cycle fatigue regimes, and successfully takes into account the loading sequence effect.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Mechanical
Zhengmao Yang, Wenhao Li, Yang Chen, Wu Zeng, Wenbo Chen, Xueqiang Cao
Summary: This work investigates the tension-tension fatigue behavior of a woven SiC/SiC ceramic matrix composite with an environmental barrier coating under elevated temperatures up to 1300 degrees C. Experimental investigations reveal the fatigue failure mechanism for SiC/SiC CMCs with EBCs under different loading conditions, and the materials undergo cyclic softening. A mechanism-based framework is proposed to interpret the fatigue behavior of CMCs through detailed fatigue experiment observations. A new fatigue damage model is developed based on the decrease in the elastic modulus, which shows good agreement with experimental data and has the potential to describe complex thermomechanical damage of SiC/SiC CMCs with EBCs.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Zhi-Qiang Tao, Ming Zhang, Yu Zhu, Tian Cai, Zi-Ling Zhang, Hu Liu, Bin Bai, Dao-Hang Li
Summary: A new calculation approach is suggested to evaluate the fatigue life of notched specimens under multiaxial variable amplitude loading, and the results demonstrate accurate estimations through experimental data validation.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Ceramics
Unni Santhosh, Jalees Ahmad, Greg Ojard, Yasser Gowayed
Summary: Results from fatigue experiments on a SiC/SiC composite are presented. A micromechanics-based model is used to study the observed behavior and the model considers progressive damage, creep, and oxidation. The deformation during fatigue in this material is primarily explained by damage in the form of matrix microcracking and interface debonding, along with creep. The stiffness of the material does not significantly change during fatigue, indicating limited contribution of fiber fracture to deformation.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Yi-Er Guo, De-Guang Shang, Di Cai, Tian Jin, Dao-Hang Li
Summary: A fatigue life prediction method based on stress normalization was proposed to reduce the influence of material property dispersion on the life of CFRC. To consider the effect of temperature on fatigue damage, a temperature influence factor was introduced into the fatigue limit equation, and a life prediction method under variable amplitude loading at high temperature was developed. The proposed method was validated using experimental results of composite multidirectional laminates under constant and variable amplitude loadings at various temperatures, with prediction errors within a factor of 5.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
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)