Article
Materials Science, Multidisciplinary
Tao Gao, Xu Zhao, Hongqian Xue, Zhidan Sun
Summary: The fracture surface characteristics and micromechanisms of fish-eye crack initiation in a Ti-6Al-4V alloy under VHCF loading were investigated. The crack initiation area exhibited ragged-like mountains, dimples, and various irregular rods/particles, grooves, and microvoids. These characteristics were primarily attributed to the nucleation and coalescence of microvoids and grooves at the alpha(s)/beta(r) interface inside the beta(trans). The beta(trans) played a dominant role in the fish-eye crack initiation and early propagation process.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Mechanical
WangSub Shin, Kyong-Ho Chang, Shazia Muzaffer
Summary: The research analyzed the fatigue performance of cruciform fillet welded joints with full and incomplete penetration under load carrying and non-load carrying conditions. It was found that welding deformation, residual stresses, and stress magnitude affect the fatigue crack initiation and fatigue life of welded structures.
ENGINEERING FAILURE ANALYSIS
(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
Engineering, Mechanical
Jin-Ha Hwang, Yun-Jae Kim, Jin-Weon Kim
Summary: This paper proposes a model to predict the initiation cycle of a cracked component under very low cycle fatigue, based on the assumption that the mechanism of crack initiation remains the same under monotonic loading. The predicted cycles are validated against different test data and show similar results in all cases.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Nanoscience & Nanotechnology
Alice Cervellon, Chris J. Torbet, Tresa M. Pollock
Summary: The anisotropic fatigue properties of three Ni-based SX superalloys were investigated in the very high cycle fatigue regime. The [111] orientation showed higher fatigue lives at high stresses but lower fatigue lives at very low stresses. The resolved shear stress on the octahedral slip systems and the pseudo-cube slip in the matrix were identified as the main reasons for the anisotropy effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Gyoko Oh, Atsushi Umezawa
Summary: This study conducted high-cycle fatigue tests on stainless steel sheets, elbow pipes, and welded specimens under combined loading states to establish criteria for fatigue failure. The cyclic stress-strain curve of the parent sheet was used for the analysis of the welded specimens, which showed Mode I or Mode I + III fatigue fracture at the stress concentration part of the weld. The crack initiation occurred on the side with higher equivalent stress, and the crack grew perpendicular to the surface of the elbow pipe. The proposed method using strain energy release rate allowed for the prediction of fatigue limit and life of similar structures.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
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
Engineering, Mechanical
Chao Wang, Yanguang Sun, Zhengyang Ren
Summary: This paper presents a viscoelastic fatigue and fracture (VEFF) modeling and its preliminary application to asphalt binder under cyclic loading. Both traditional time sweep (TS) fatigue test and linear amplitude sweep (LAS) test are performed. The failure definition is unified from the peak of fracture energy. The binder fatigue performance is dominated by its resistance to crack propagation. A mechanistic criterion paradigm is established to be independent of the strain ramping rate in LAS and strain amplitude in TS tests. The proposed model is verified by various binders, demonstrating the reasonable use of the LAS as an accelerated fatigue protocol.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Huijing Zhang, Xiaohui Zhao, Yu Liu
Summary: The research results indicate that HFIR treatment can refine the grain sizes on the surface of welded joints and increase the hardness, elastic modulus, and residual stress, effectively extending the fatigue crack growth life of welded joints.
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
Tao Gao, Hongqian Xue, Zhidan Sun
Summary: The VHCF properties and damage mechanisms of a Ti-6Al-4V alloy with needle-like beta phase were investigated, revealing that fatigue damage is primarily caused by interior crack initiation with a fish-eye pattern. The formation of this particular appearance is attributed to the nucleation and coalescence of microvoids and grooves occurring in the transformed beta phase (beta(t)), which plays a dominant role in the crack initiation process of Ti-6Al-4V in the VHCF regime.
Article
Engineering, Mechanical
Tao Gao, Hongqian Xue, Zhidan Sun, Delphine Retraint, Yanli He
Summary: The fatigue behavior and damage mechanisms of a Ti-8Al-1Mo-1V alloy were investigated in the very high cycle fatigue (VHCF) regime. It was found that the crack initiation area is characterized by nano-marking facets and flat facets induced by slip activity. The large scatter in fatigue life can be attributed to slip inhomogeneity.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Civil
Thin Thin Htut, Satoyuki Tanaka, Donghui Ma, Jun Okada, Masahito Honnami, Kaoru Shinoda, Masamitsu Abe, Takeru Katayama
Summary: A novel fatigue test specimen was developed to investigate the fatigue fracture behaviors of a shell and tube heat exchanger. The specimen consisted of a single tube and a tubesheet joined by welding to form a tube-to-tubesheet welded joint. A fatigue test was conducted under tensile cyclic load, and defects were generated from the root of the joint, propagating with complex crack front trajectories. Crack propagation (CP) simulation was performed using the extended finite element method (X-FEM) to study the CP behavior. The experimental and numerical studies successfully revealed the fundamental fracture characteristics of the welded joint.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Mingyang Ma, Ruilin Lai, Jin Qin, Bin Wang, Huiqun Liu, Danqing Yi
Summary: The weld reinforcement has a significant impact on the mechanical properties of MIG welded joints. While increasing the tensile strength of the joint, it has a detrimental effect on fatigue properties by altering the mechanism of fatigue crack initiation and rupture compared to smooth specimens.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
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
Mechanics
Bin-Bin Zhuang, Yan-Nan Du, Shuo Weng, Ming-Liang Zhu, Fu-Zhen Xuan
Summary: The transition behavior of fatigue crack growth was investigated using data from a CrNiMoV steel welded joint. It was found that the m-lnC relationship was linearly correlated under a given stress ratio in both Paris and near-threshold regimes. The coordinate of the transition point was determined as the slope and intercept of the m-lnC relationship. A new model for predicting the transition point was established, which is significant for accurate fatigue life assessment based on the bilinear approach.
ENGINEERING FRACTURE MECHANICS
(2022)
Review
Engineering, Mechanical
Yang Fu, Gang Zhu, Mingliang Zhu, Fuzhen Xuan
Summary: Traditional design, manufacturing, and maintenance methods have become inefficient in the digitized world, and there is a need for a unified platform for integration. The concept of digital twin and associated technology provide a solution for the integration of design, manufacturing, and maintenance throughout the product lifecycle.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2022)
Article
Engineering, Mechanical
Ming-Liang Zhu, Gang Zhu, Fu-Zhen Xuan
Summary: This study explores the mechanism of the formation of fine granular area morphology in the case of very high cycle fatigue failure of high strength steel. It proposes a microstructure-dependent crack initiation and early growth model based on the fragmentation of martensitic laths and formation of dislocation cells. The model has been verified under environmental fatigue and found applicable to white etching crack in rotating contact fatigue. Additionally, a machine learning-Z parameter integrated approach for fatigue life prediction has been developed, showing promise for designing engineering structures with long life.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Mechanics
Rong Chen, Xiao-Kai Hu, Ming-Liang Zhu, Fu-Zhen Xuan
Summary: In this study, the near-tip strain was characterized and statistically analyzed to develop a strain-based criterion for evaluating crack-tip plasticity under both tensile and fatigue loadings. The near-tip strain of 304 stainless steel followed a Lognormal distribution, while that of 25Cr steel followed a Gauss distribution and evolved to a Logistic-Gauss-Lognormal distribution with fatigue crack growth and plasticity increase. A relative strain accumulation parameter was proposed, which represented the branch or stable growth mode, and fatigue crack growth occurred when the relative strain accumulation exceeded 1.3. The cracking speed parameter was established and indicated that different cracking behaviors at the macro-scale behaved similarly at the atomic scale. Microstructural damage analysis revealed that fatigue crack growth in 25Cr steel was governed by breakdown of lathy martensite and formation of fine grains, while cracking in 304 stainless steel was accompanied by austenite-to-martensite transformation occurring at a near-tip strain of approximately 13%.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Yang Fu, Tong Li, Ya-Bin Yan, Xiao-Yuan Wang, Ming-Liang Zhu, Fu-Zhen Xuan
Summary: In this study, the mechanism of metal-H interaction in Cr-Mo steels was investigated. The results showed that different atomic doping had different effects on hydrogen behavior in the steel, with C, Si, and Mo doping making the solid solution of hydrogen easier, while Mn and Cr doping made it more difficult.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Yunjian Song, Shu Huang, Jie Sheng, Emmanuel Agyenim-Boateng, Yunfeng Jiang, Qiang Liu, Mingliang Zhu
Summary: The hydrogen embrittlement resistance of 2205 duplex stainless steel treated with laser peening was investigated. Laser peening changed the morphology and distribution of the ferrite and austenite phases, altering the path of hydrogen transport and diffusion. The refined grain structure induced by laser peening increased the difficulty of hydrogen atom penetration by providing more tortuous grain boundaries. Furthermore, the beneficial microstructures induced by laser peening, such as dislocation entanglements and mechanical twins, helped trap hydrogen atoms and reduce their mobility. Hydrogen determination tests provided direct evidence of reduced hydrogen penetration. Additionally, the depth of the brittle region in the tensile fracture was inversely proportional to the laser power density, indicating that increasing laser power density can decrease the hydrogen embrittlement sensitivity of the 2205 duplex stainless steel.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Multidisciplinary
Sijie Shen, Bingchuan Yan, Ting Wang, Guiyi Wu, Shuyan Zhang, Mingliang Zhu
Summary: This paper investigates the effects of various factors on the crack driving force (CDF) of weld center crack (WCC) and HAZ center crack (HAZCC) on the inner surface of X80 pipes. The results show that the CDF is significantly influenced by crack size, crack location, strength mismatch, and HAZ softening coefficient. The distribution of the J-integral at the crack tip is also investigated, and a strain-based failure assessment diagram (SB-FAD) considering various factors is developed. This study provides valuable insights for the safety assessment of crack-like defects on the inner surface of X80 pipeline girth welds.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Mechanics
Yu-Ke Liu, Jia-Le Fan, Gang Zhu, Ming -Liang Zhu, Fu -Zhen Xuan
Summary: Research on life prediction for mechanical structures in very high cycle fatigue regime is crucial, but collecting fatigue data can be expensive and time-consuming. To address this, machine learning's data-driven approach has emerged as a solution. In this study, a small dataset of GCr15 bearing steel subjected to very high cycle fatigue tests was extracted, and the Z-parameter model was used to generate extended datasets. Models driven by support vector machine, artificial neural network, and Z-parameter based physics-informed neural network were established. The physics-informed neural network calibrated by Z-parameter model trained on a larger dataset demonstrated more accurate and reliable prediction compared to other models. The effectiveness of Z-parameter in data extension and model construction as priori physics knowledge for a data-driven approach was shown. In the future, the Z-parameter model deserves more attention in life prediction for engineering materials and structures in the very high cycle fatigue regime.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Jia-Le Fan, Gang Zhu, Ming-Liang Zhu, Fu-Zhen Xuan
Summary: This study combines physical parameters with artificial neural networks to predict the fatigue life of 15Cr and FV520B-I steels. The results show that this approach has higher predictive accuracy compared to traditional physical parameter models and the Mayer model.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Shun Zhang, Xiao-Long Li, Jian-Feng Zhang, Lu Zhang, Ming-Liang Zhu, Fu-Zhen Xuan
Summary: The high cycle fatigue behavior of the FGH96 alloy inertia friction welded joint under axially push-pull cyclic loading at 650°C was studied. The results showed that the fatigue strength of the welded joint was comparable to that of the pure base metal. The larger grain size, more twin boundaries, and high angle grain boundaries in the base metal induced a higher crack initiation potential. Interior crack initiation was dominant, and it was transferred from large facet to twin-assisted facet, and finally to inclusion with decreasing stress level. The Z-parameter model was applied for the first time to predict the fatigue life in the case of facet-induced crack initiation, and good agreement was achieved between the prediction and experimental data.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Yi-Fan Yang, Hua-Yan Hu, Lin Min, Qian-Tao Sun, Miao Song, Ming-Liang Zhu, Jian-Feng Wen, Shan-Tung Tu
Summary: The HCF and VHCF behaviors and failure mechanism of Inconel 718 were investigated through ultrasonic fatigue tests and microscopic characterization techniques. It was found that the S-N curve continuously decreases in the HCF regime, while forming a plateau for VHCF. Cracks initiate from a single site on the surface or subsurface. Site-specific focused ion beam sampling and transmission electron microscopy characterization revealed that the crack initiation is governed by slip-induced localized plastic deformation. Microcracks initiate near non-metallic inclusions or slip band-grain boundary sites. Furthermore, a life correlation model considering the size of micro-defect was proposed to better correlate the fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Xiangkang Zeng, Conghui Zhang, Wenguang Zhu, Mingliang Zhu, Tongguang Zhai, Chi Ma, Tingchuang Shu, KangKai Song
Summary: This study investigated the deformation and crack initiation behaviors of pure Zr under fully-reversed cyclic deformation with different strain amplitudes. It was found that prismatic slip with a higher Schmid Factor was the dominant deformation mode. Fatigue cracks mainly initiated at persistent slip bands and grain boundaries. The interaction of persistent slip bands with grain boundaries resulted in strain transferring to the neighboring grains. Higher geometrical compatibility factor and lower residual Burgers vector reduced strain localization.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Hang Zhang, Shu Huang, Jie Sheng, Cheng Wang, Junhui Zhang, Mingliang Zhu, Emmanuel. Agyenim-Boateng, Chaoxu Liang, Bin Xue, Hongwei Yang, Jianzhong Zhou, Jinzhong Lu
Summary: This research proposes a novel photocuring 4D printing strategy for manufacturing intelligent materials and structures with adjustable shape recovery rate, sequential recovery behavior, and high-load deformation capability.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Yu-Hui Huang, Fang-Xin Yang, Nan Wang, Ming-Liang Zhu, Fu-Zhen Xuan
Summary: This study investigated the effect of low cycle fatigue on stress corrosion cracking susceptibility in a CrNiMoV steel. Interrupted fatigue tests in air and slow strain rate tensile tests in 3.5 wt% NaCl solution at 180°C were conducted. It was found that cyclic softening improved stress corrosion cracking resistance by deflecting cracks along lath martensites. The microstructure evolution due to low cycle fatigue damage was well described by the Kernel Average Misorientation (KAM) from Electron Backscatter Diffraction.
NPJ MATERIALS DEGRADATION
(2023)
Article
Engineering, Mechanical
Chen Wang, Rong Chen, Su-Juan Guo, Ming-Liang Zhu, Fu-Zhen Xuan
Summary: Cyclic plastic finite element modeling was conducted to investigate the impact of overload on fatigue crack growth. The study found that the stress transfer mechanism was more pronounced in the case of crack blunting, but its effect was limited in time. It was also observed that the level of crack closure varied periodically due to the gradual relaxation of compressive residual stress.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(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)
