Article
Engineering, Mechanical
Ruiming Zhang, Kai Ma, Wenzhu Peng, Jinyang Zheng
Summary: The fatigue crack growth rates of 4130X steel in different hydrogen concentrations were measured, and the influence of hydrogen on crack behavior was analyzed. Results show that the crack growth rate increases with increasing hydrogen pressure, reaching a threshold at 87.5 MPa.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
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
Engineering, Mechanical
Alireza Golahmar, Philip K. Kristensen, Christian F. Niordson, Emilio Martinez-Paneda
Summary: A new theoretical and numerical approach based on phase field has been proposed for predicting hydrogen-assisted fatigue. The role of hydrogen in fatigue crack growth is investigated, and virtual S-N curves for both notched and smooth samples are obtained, showing good agreement with experiments.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Rebeca Fernandez-Sousa, Covadonga Betegon, Emilio Martinez-Paneda
Summary: In this study, we investigate the influence of microstructural traps on hydrogen-assisted fatigue crack growth. A new formulation combining multi-trap stress-assisted diffusion, mechanism-based strain gradient plasticity, and a hydrogen- and fatigue-dependent cohesive zone model is presented. The results show that the ratio of loading frequency to effective diffusivity governs fatigue crack growth behavior. Increasing the density of beneficial traps, not involved in the fracture process, results in lower fatigue crack growth rates. The study identifies the combinations of loading frequency and carbide trap densities that minimize embrittlement susceptibility, providing a foundation for the rational design of hydrogen-resistant alloys.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Yuhei Ogawa, Haruki Nishida, Masami Nakamura, Vigdis Olden, Alexey Vinogradov, Hisao Matsunaga
Summary: This study investigates the fatigue crack growth behavior of two carbon steels with different pearlite volume fractions in a pressurized gaseous hydrogen environment. The results show that pearlite can mitigate the accelerated crack growth caused by hydrogen. This is mainly attributed to the perpendicular alignment of ferrite/cementite lamellar in pearlite to the cracking direction, which acts as barriers to intermittently arrest crack propagation. However, the presence of pearlite lamellar parallel to the crack-plane leads to brittle delamination fracture, increasing the crack growth rate and compromising the mitigating effect of pearlite.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
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
Engineering, Mechanical
Chenfeng Duan, Shengguan Qu, Xiongfeng Hu, Siyu Jia, Xiaoqiang Li
Summary: This paper investigates the effect of electropulsing-assisted ultrasonic surface rolling (EUSR) on 25CrNi2MoV steel. The EUSR process results in the formation of nano-gradient structures, reduction in surface roughness and improvement in surface hardness, residual compressive stress, and fatigue resistance. Furthermore, EUSR treatment significantly increases the depth of hardened and residual stress layers, prolongs the fatigue life of the specimens, and identifies the misorientation of adjacent grains as an important indicator affecting fatigue crack growth.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
T. Ramgopal, Ashwini Chandra, Xiaoji Li, Francois Ayello
Summary: This paper investigates the environmentally assisted cracking of high-strength nickel-based alloys in a 3.5 wt% NaCl (pH = 8.2) solution under cathodic polarization. The crack growth rates under cyclic, static, and varying stress intensity loading modes are studied, revealing susceptibility to hydrogen embrittlement. Alloy 725 shows the highest susceptibility, while Alloy 718 exhibits the highest resistance. The crack growth rates are affected by loading frequency and strain rate, and first principles modeling suggests water adsorption under the crack tip conditions.
Article
Chemistry, Multidisciplinary
F. He, V. K. Thakur, M. Khan
Summary: The study emphasizes the importance of comprehensive research on the crack propagation behavior of polymeric structures fabricated using three-dimensionally printed parts. Existing studies are found to be limited in accurately assessing the true crack growth phenomenon in real applications, posing a challenge for evaluating crack growth under time-dependent coupled loading conditions.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Mechanics
Oguzhan Demir
Summary: This paper presents a numerical methodology for predicting crack growth path and life of structures containing cracks, applied to three different case studies on spur gear tooth. Three-dimensional non-planar fatigue crack propagation analyses are conducted using FRAC3D, showing close agreement with available data from the literature in terms of crack growth trajectories. The methodology and criteria introduced can be utilized for three-dimensional crack growth analysis with less user intervention, time, and effort.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Tingsen Zheng, Nian-Zhong Chen
Summary: A cyclic cohesive zone model is proposed in this paper to predict hydrogen assisted fatigue crack growth, considering the degradation of cohesive strength and accumulated cohesive length. An inverse Logistic formula is introduced to describe the degradation model of the accumulated cohesive length. The prediction results of the proposed model are compared with experimental data of fatigue crack growth rates (FCGRs) of API 5L Grade B, X42 and X52 pipeline steels under hydrogen environment, and the results demonstrate a good agreement between the predicted FCGRs and the experimental data.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Sang Min Lee, Sang-Youn Park, Un Bong Baek, Byoung-Ho Choi
Summary: The effect of high-pressure hydrogen on an SA-372 Grade J steel pressure vessel was analyzed through fatigue crack growth testing, fracture toughness testing, and finite element analysis. The test results, including the degradation of fracture toughness and the presence of hydrogen inflection in the fatigue crack growth rate, were used in the finite element analysis to analyze the fatigue crack growth behavior under different conditions. The residual fatigue life was evaluated considering the morphological evolution of the crack, the initial aspect ratio, and the initial crack-to-depth ratio.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
A. Zafra, G. Alvarez, G. Benoit, G. Henaff, E. Martinez-Paneda, C. Rodriguez, J. Belzunce
Summary: We investigated the effects of conducting hydrogen-assisted fatigue crack growth experiments in different environments on welded 42CrMo4 steel. The results showed significant differences between testing approaches and weld regions. Microscopy analysis and finite element modelling were used to explain these differences. Both testing approaches revealed higher susceptibility to hydrogen embrittlement in the heat affected zone, with similar microstructural behavior observed in both regions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Jihwi Kim, Michael R. Hill
Summary: This study develops a method to predict crack face contact under linear elastic conditions in a residual stress-bearing body. The method applies the weight function to compute a system of linear equations that can determine crack face contact pressure. The method is validated against the finite element method and shows good agreement in predicting crack face contact and the effects of residual stress on fatigue crack growth.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Alexander Bosch, Michael Vormwald
Summary: A new concept for predicting fatigue life based on cyclic J-integral modeling was proposed and validated on austenitic stainless steel, considering factors such as stress concentration and nonhomogeneous microstructure. The model shows practical value for understanding fatigue behavior under variable loads.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
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)