Article
Chemistry, Physical
Yang Liu, Ping Jiang, Guihua Duan, Jing Wang, Lingling Zhou, Jijia Xie
Summary: This paper investigates the behavior and mechanism of fatigue crack propagation in CrCoNi medium-entropy alloys with heterogeneous microstructures. Experimental results show that specimens with partial recrystallization microstructures have higher crack propagation rates and opposite effects on fatigue crack thresholds compared to those with complete recrystallization microstructures. Fatigue cracks in recrystallization grains grow along slip planes or twin boundaries, leading to crack deflections and roughness-induced crack closure effect. The area percentage of recrystallization and grain size of recrystallization grains significantly affect the value of the fatigue crack growth threshold.
Article
Materials Science, Multidisciplinary
Duncan W. MacLachlan, Vasilis Karamitros, Fionn P. E. Dunne
Summary: This paper proposes an engineering approach to the problem of fatigue crack initiation at the microstructural scale. The initiation of fatigue cracks is broken down into separate processes, and a fundamental approach to modelling these processes has been developed. The method successfully correlates with fatigue data for a specific material.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Vasilis Karamitros, Duncan W. MacLachlan, Fionn P. E. Dunne
Summary: Mechanistic short crack growth in single crystal Ni gamma-gamma' microstructure is investigated using Crystal Plasticity (CPFEM) and eXtended Finite Element Method (XFEM). The study hypothesizes that maximum slip and stored energy density are the mechanistic drivers for the crack path and growth rate in gamma-gamma' microstructures.
Article
Engineering, Mechanical
Guoying Sui, Zhenqiang Wang, Jiarui Li, Chengzhi Zhao, Fengchun Jiang, Hongliang Li
Summary: In this study, the fatigue characteristics and cracking behaviors of 42CrMo steel with two different microstructures (fine/coarse-grain tempered sorbite/bainite) were investigated. It was found that fine-grain microstructure exhibits higher fatigue strength, while the coarse-grain microstructure has a higher fatigue crack growth threshold. The presence of multiple fatigue sources and higher-degree ratchetting-fatigue damage in the coarse-grain microstructure accelerates fatigue crack initiation. Roughness-induced crack closure in the coarse-grain microstructure leads to a delay in fatigue crack growth and an increase in the fatigue crack growth threshold.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Ruike Zhao, Huaizhi Zhao, Lei Lu
Summary: In this study, we investigated the fatigue crack growth characteristics of bulk nanotwinned Cu with different microstructural aspects. The results show that the nanotwinned Cu has significantly improved fatigue resistance compared to conventional polycrystalline Cu, which can be attributed to the activation of specific primary slip systems.
SCIENCE CHINA-MATERIALS
(2023)
Article
Mechanics
Guoying Sui, Zhenqiang Wang, Fengchun Jiang, Chengzhi Zhao, Yibin Guo, Wanyou Li
Summary: Microstructural differences of two different tempered sorbite/bainite (TS/B) microstructures, fine TS/B structures (M42) and coarse TS/B structures (M52), have been analyzed to understand fatigue crack propagation (FCP) behaviors of 42CrMo steel. The FCP rates of M42 and M52 are similar in most AK regimes, but M52 shows slower FCP rate than M42 in the near-threshold (I-L) to early Paris-regime (II-E) with low AK. The microstructure-induced crack closure and crack retardation behavior in M52 is attributed to the more tortuous FCP path and numerous micro-cracks in B and larger-sized crack deflections at the carbides and boundaries compared to M42, especially in the I-L.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Daniel J. Long, Weifeng Wan, Fionn P. E. Dunne
Summary: In this study, crystal plasticity finite element modeling with the eXtended Finite Element Method and a stored energy density fracture criterion were used to investigate the fatigue crack growth rate in Zircaloy-4. The results showed that the growth rate fluctuations at microstructural features were primarily driven by elastic anisotropy and yield stress mismatch. Additionally, the reduced growth rate in soft hexagonal close packed grains was linked to crack path tortuosity, which was controlled by the cyclic development of an in-plane shear back stress. Moreover, the stored energy density accurately captured the major microstructure-driven differences in crack growth rate.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Jin-Qun Zhu, Yi-Xin Lu, Lin-Gen Sun, Shu Huang, Lin-Bo Mei, Ming-Liang Zhu, Fu-Zhen Xuan
Summary: The fatigue crack growth behavior of Inconel 740H and Haynes 282 nickel-based alloys was investigated at different temperatures. The results showed an increased fatigue crack growth rate for both alloys, with Inconel 740H exhibiting an increased fatigue threshold at high temperatures. The presence of MC carbides, serrated grain boundaries, and twins affected the crack growth path. The interaction between the strengthening ?' phase and dislocations was different in the two alloys, with Haynes 282 exhibiting shear mechanisms and Inconel 740H exhibiting Orowan bypass mechanisms at elevated temperatures. The resistance of dislocation movement was reduced by cross slip, dislocation climbing, and entanglement, leading to accelerated damage accumulation. The different Cr content in the two alloys promoted the formation of different carbides and oxide layers, which played a role in the fatigue threshold at elevated temperatures.
MATERIALS CHARACTERIZATION
(2023)
Article
Mechanics
Gabriel Riedl, Robert Pugstaller, Gernot M. Wallner
Summary: Delamination is a common failure mode in laminated structures. This study developed a novel fatigue test setup for simultaneous characterization of multiple specimens, which is important for evaluating cyclic debonding resistance and adhesive formulation development.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Peirong Ren, Philip J. Withers, Zhengxing Zuo, Huihua Feng, Weiqing Huang
Summary: The influence of microstructure on the behavior of short fatigue cracks in cast Al-Si alloy under high cycle loading conditions was investigated. It was found that in the early stage, cracks mainly grew transgranularly and were frequently inhibited at grain boundaries. In the late stage, the crack growth mode shifted from crystallographic to noncrystallographic. Finer microstructures offered greater resistance to crack nucleation and propagation.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Yijing Wang, Yulong An, Guoliang Hou, Xiaoqin Zhao, Huidi Zhou, Jianmin Chen
Summary: This study investigates the microstructure regulation of Ti6Al4V alloy and its influence on crack propagation behavior under ultrasonic cavitation. The results show that due to the existence of fewer slip systems, higher hardness and elastic resilience of alpha phase, as well as the presence of substructures, it is difficult to initiate and propagate cracks in the alpha phase during cavitation erosion compared to the beta phase. The Ti6Al4V alloy after heat treatment with air cooling exhibits excellent cavitation erosion resistance, attributed to the precipitation of acicular secondary alpha grains inside the transformed beta phase and the formation of nanotwins in the interface between transformed beta phase and primary alpha phase.
Article
Chemistry, Physical
Yuhei Ogawa, Keiichiro Iwata
Summary: This study investigates the fatigue crack growth (FCG) property of pearlitic steel in a high-pressure hydrogen gas environment. Results show that pearlitic steel exhibits less hydrogen-induced FCG acceleration compared to martensite and pure ferritic iron at the same strength level, especially under slow loading-rate conditions, which is beneficial for suppressing time-dependent cracking.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Nanoscience & Nanotechnology
Motoki Sakaguchi, Yoshinori Niwa, Wenxiang Gong, Keisuke Suzuki, Hirotsugu Inoue
Summary: The study found that at high temperatures, the fatigue crack growth resistance of the triplex microstructure is significantly increased, mainly due to the higher volume fraction of ductile p phase. Meanwhile, the fatigue crack growth threshold in different microstructures and temperatures is almost comparable and shows the same temperature dependency.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Hailin Zhai, Wenjie Zhang, Jishen Jiang, Xianfeng Ma, Huanyue Lin, Changquan Xiao, Shuai Wang, Wenjia Qiu, Jingyu Zhong
Summary: The effects of microstructure on fatigue short crack propagation behavior of Al0.3CoCrFeNi high entropy alloys (HEAs) were investigated using in-situ fatigue testing under scanning electron microscope (SEM). The experimental results showed that specimens with fine grain (FG) had better fatigue crack propagation resistance and longer fatigue life compared to specimens with coarse grain (CG). The fatigue short crack propagation followed a transgranular mode associated with octahedral slip. The fatigue small crack growth was mainly microstructurally sensitive, exhibiting noticeable fluctuations related to the blocking effects of grain boundaries and twin boundaries. Furthermore, a modified fatigue crack growth model was proposed, which could effectively evaluate the crack growth rates of HEAs with different grain microstructures under different fatigue stresses.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Multidisciplinary
Mengmeng Wang, Shizhe Feng, Atilla Incecik, Grzegorz Krolczyk, Zhixiong Li
Summary: In this work, a digital twin-driven approach is proposed to accurately predict the fatigue life of a structure by establishing effective communication between a DT virtual model and a physical model. The proposed approach consists of three modules and operates in offline and online stages. Experimental results demonstrate that the proposed approach can efficiently and accurately predict fatigue crack growth.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Mechanical
P. Chowdhury, H. Sehitoglu, W. Abuzaid, H. J. Maier
INTERNATIONAL JOURNAL OF PLASTICITY
(2015)
Article
Materials Science, Multidisciplinary
Piyas Chowdhury, Guowu Ren, Huseyin Sehitoglu
PHILOSOPHICAL MAGAZINE LETTERS
(2015)
Article
Engineering, Mechanical
Sertan Alkan, Piyas Chowdhury, Huseyin Sehitoglu, Richard G. Rateick, Hans J. Maier
INTERNATIONAL JOURNAL OF FATIGUE
(2016)
Article
Engineering, Mechanical
P. Chowdhury, H. Sehitoglu, H. J. Maier, R. Rateick
INTERNATIONAL JOURNAL OF PLASTICITY
(2016)
Article
Materials Science, Multidisciplinary
Piyas B. Chowdhury, Huseyin Sehitoglu, Richard G. Rateick, Hans J. Maier
Article
Engineering, Mechanical
Piyas B. Chowdhury, Huseyin Sehitoglu, Richard G. Rateick
INTERNATIONAL JOURNAL OF FATIGUE
(2014)
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)