Article
Materials Science, Characterization & Testing
Giorgia Scetta, Nathan Selles, Patrick Heuillet, Matteo Ciccotti, Costantino Creton
Summary: The study shows that the stress-stretch curve of TPUs changes with the number of applied cycles when cyclically loaded up to the same value of maximum stretch, but eventually reaches a steady state. A suitable methodology based on fracture mechanics approach is proposed to evaluate the cyclic fatigue resistance in TPUs, with additional treatments to account for the higher tendency to creep of TPUs compared to thermoset rubbers. Comparing the results with classical filled rubbers, TPUs demonstrate excellent toughness and cyclic fatigue resistance, suggesting new opportunities for applications requiring resistance to crack propagation under cyclic loading at large strains.
Article
Engineering, Marine
Qin Dong, Geng Xu, Yaoyu Hu, Ziya Peng
Summary: The main objective of this paper is to investigate the residual strength of a cracked plate considering fatigue crack propagation under cyclic loading. Factors such as crack length, number of cycles, tensile/compressive cyclic loads, and out-of-plane deformation are considered in the study of residual strength. The numerical results provide insight into the effect of crack propagation on structural residual strength, aiming to guide the evaluation of residual strength in cracked components.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Huawen Ye, Ruosen Huang, Yu Zhou, Jilin Liu
Summary: This study proposes a reverse-reasoning method to obtain and calibrate the Paris law constants. The accuracy of the method is confirmed through finite element modeling and sensitivity analysis. The results show that the constant m is stable, while the prestress effect significantly affects the constant C.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Mengdi Jia, Zhimin Wu, Rena C. Yu, Xiaoxin Zhang
Summary: This study investigates the mixed mode I-II fatigue crack propagation process of the three-point bending (TPB) beam using the digital image correlation (DIC) method. The results show that the mixed mode I-II crack propagation path under fatigue loading is consistent with that under static loading. A unified model for characterizing mixed mode I-II fatigue crack propagation in concrete is developed based on the experimental results. The feasibility of predicting the fatigue life of concrete structures using the proposed model is explored.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
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
Keisuke Fujita, Hayato Tsuboi, Shoichi Kikuchi
Summary: The effect of grain size on fatigue crack propagation in a CrMnFeCoNi alloy was evaluated. It was found that there were no noticeable differences in fatigue threshold between specimens with fine-grained and coarse-grained structures at low force ratios due to fatigue crack reflection inside coarse grains. Even in the fine-grained specimens, the magnitude of crack closure was high, exceeding that of austenitic stainless steel with the same fine grains. Therefore, the effect of grain size on the threshold stress intensity factor range was not significant in the present CrMnFeCoNi alloy, unlike austenitic stainless steels.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Yanfei Niu, Haoliang Huang, Jiangxiong Wei, Chujie Jiao, Qiangqiang Miao
Summary: The study investigates the fatigue crack propagation behavior in ultra-high-performance concrete (UHPC) containing different volume fractions of steel fibers under cyclic flexural loading. Different UHPC specimens exhibit varying critical crack lengths and propagation rates, with strain diagrams showing distinct patterns for crack growth. The research highlights the importance of reducing applied stress level and increasing steel fiber reinforcement to enhance fatigue life.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Xiaochuan Ma, Yajie Wang, Xianghe Wang, Weibin Yin, Linya Liu, Jingmang Xu
Summary: Fatigue crack propagation in rails is a significant issue for railway maintenance cost and operating safety. Studying the fatigue crack propagation rules of different rail materials provides scientific guidance for rail selection and maintenance plans. By conducting fatigue crack propagation tests on U71Mn and U75V rails, fracture criteria were established and verified. A peridynamic model was used to analyze the crack propagation process in the two types of rails. Simulation results showed that U71Mn rail, with a lower crack propagation rate than U75V rail, is more suitable for high-speed railways. The rate of crack propagation increases with wheel load and wheel-rail friction coefficient. Measures like improving track regularity and lubrication could be taken to reduce wheel-rail impact and friction coefficient to prolong rail service life.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Leonid K. Leshchinskiy, Vitaliy P. Ivanov, Elena V. Lavrova, Dmitry P. Il'yaschenko
Summary: This paper presents the experimental analysis of data that shows the increased resistance of heterogeneous multilayer clad composites to dynamic loading destruction compared to homogeneous materials. The crack retardation caused by lamination at the boundary of the layers is believed to be the reason for this. The study also demonstrates the crack retardation in the destruction of heterogeneous compact composite samples by cyclic off-center stretching, with the fractogram clearly showing the transverse tightening of the sample section. It argues that crack nucleation plays a decisive role in the process of dynamic destruction of heterogeneous composites obtained by both multilayer cladding and explosion welding.
Article
Materials Science, Multidisciplinary
Tu-Ngoc Lam, Hsu-Huan Chin, Xiaodan Zhang, Rui Feng, Huamiao Wang, Ching-Yu Chiang, Soo Yeol Lee, Takuro Kawasaki, Stefanus Harjo, Peter K. Liaw, An-Chou Yeh, Tsai-Fu Chung, E-Wen Huang
Summary: The present study investigates the effect of crystallographic texture on fatigue resistance in CoCrFeMnNi high-entropy alloys. X-ray nano-diffraction and electron backscatter diffraction techniques were used to study the deformation behavior and texture evolution. Twinning-induced shear deformation was found to enhance the fatigue resistance of the alloy. These findings address the quantitative discrepancy observed in previous studies.
Article
Engineering, Mechanical
Guoying Sui, Zhenqiang Wang, Xuming Fang, Guhui Gao, Chengzhi Zhao, Yibin Guo, Yixing Song, Fengchun Jiang
Summary: This study investigates the intrinsic correlation between macroscopic ratchetting-fatigue behavior and microscopic mechanisms in a quenching & tempering 42CrMo high-strength structural steel under near-yield mean stress conditions. The results show that fatigue strength decreases significantly with increasing mean stress, and two distinct fracture patterns were observed. The study provides important insights for predicting the fatigue lifetime of actual bolt fasteners.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Jinci Chen, Jiangteng Li, Gang Ma
Summary: This study investigates the growth and damage mechanism of Mode I cracks through compression tests and SEM analysis. The results show that the crack growth process can be divided into three stages, and the crack growth rate is positively correlated with the stress intensity factor.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
J. Song, L. G. Zhao, H. Qi, S. Li, D. Shi, J. Huang, Y. Su, K. Zhang
Summary: A coupled phase field-viscoplasticity approach was developed for modeling deformation and crack growth in a nickel-based superalloy under fatigue loading. The model effectively predicts cyclic softening behavior, fatigue crack propagation under varied dwell times, and 3D crack growth behavior. The predictive capability of the coupled model is confirmed by capturing geometric features and overall crack growth rate.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Engineering, Mechanical
Diego Erena, Jesus Vazquez, Carlos Navarro, Jaime Dominguez
Summary: In this article, a new fretting fatigue life prediction model is proposed, which automatically determines the crack direction based on the crack initiation length, and obtains excellent correlation between experimental and predicted results.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
Carlos G. Davila, Mathew W. Joosten
Summary: A new cohesive fatigue model (CF22) is proposed based on extensive experimental data characterization. To reduce the number of parameters required, experimental Paris law data is transformed into a plot of amplitude versus mean relative endurance and fitted using an empirical function. This novel characterization procedure helps identify trends and inconsistencies in the data and provides model input parameters without needing inverse analysis. The CF22 fatigue model improves the predictions of crack propagation rates and thresholds, especially under high stress ratios and mode mixity.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
R. Gholami, Saleh Akbarzadeh, S. Ziaei-Rad, M. M. Khonsari
Summary: The study aims to investigate the impact of nano-particles' weight fraction on the friction coefficient in mixed-lubrication regime through experimental and theoretical analysis. Results demonstrate good agreement between theoretical and experimental findings, with a parametric study conducted to explore additional influencing factors.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Behnam Hajshirmohammadi, Michael M. Khonsari
Summary: An online approach using thermoelectricity was proposed to predict the fatigue life of metallic specimens under cyclic loading. The methodology was validated with experimental results, showing a practical methodology for early prediction of fatigue. The correlation between thermoelastic potential and fatigue life was demonstrated in low-carbon steel 1018 specimens measured via an infrared camera.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Engineering, Mechanical
Arash P. Jirandehi, M. M. Khonsari
Summary: A statistical method is presented for estimating the plastic strain energy per cycle in metals under fatigue. The distribution of plastic strain under cyclic loading follows a two-parameter Weibull probability function and a second probability function is incorporated to account for different crystallographic directions. Results from a thermodynamically based model and a finite element model support the predictions made using the statistical method.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
A. Nourian-Avval, M. M. Khonsari
Summary: This paper proposes a model for predicting fatigue life under multiaxial loading based on dissipated heat during fatigue tests, evaluating fatigue damage by considering different rates of dissipated energy under various multiaxial loadings. The predictive capability of the models is confirmed through comparison with experimental fatigue results.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
M. Mehdizadeh, M. M. Khonsari
Summary: The study presented an experimental and theoretical analysis of low carbon steel 1018 subjected to multiaxial loading, showing that different loading conditions affect fatigue life. The use of thermography for fatigue life prediction was more accurate than hysteresis loops in capturing specimens' fatigue life under multiaxial fatigue loading.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Joonyoung Jang, Michael M. Khonsari
Summary: A new nonlinear fatigue damage accumulation model is developed in this paper, which considers the loading sequence effect and predicts the rate of damage by introducing a loading sequence parameter. The applicability of the proposed model is validated using nine sets of independent experimental measurements of fatigue life under multiple loading sequences, showing that the predictions are in agreement with the measured results and providing a reliable estimation of fatigue life.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Review
Engineering, Mechanical
Arash P. Jirandehi, Michael M. Khonsari
Summary: Recent progress in microstructure-sensitive research has led to insights on estimating fatigue damage and predicting useful life. A computational crystal plasticity approach incorporating statistical representations of material microstructure and a new thermodynamically based framework has been suggested.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Composites
Ali Mahmoudi, Michael M. Khonsari
Summary: A new approach utilizing the concepts of kinetic strength and fracture fatigue entropy can reliably predict the fatigue life of laminated composites by considering the temperature and time dependence through Zhurkov's model.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Engineering, Mechanical
Ali Mahmoudi, M. M. Khonsari
Summary: A new method based on the fracture fatigue entropy (FFE) criterion is proposed to predict the fatigue life of metals. This method utilizes the concept of kinetic strength of solid materials to rapidly predict the cyclic plastic strain energy and temperature evolution. Experimental results for Al 7075-T6, LCS 1018, API 5L X52, and MCS 1045 are compared with theoretical predictions, demonstrating that this model can reliably predict the temperature evolution, plastic strain energy dissipation, and fatigue life of metals.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Arash P. Jirandehi, Ali Haghshenas, M. M. Khonsari
Summary: In this study, fully-reversed bending fatigue and impulse excitation tests were conducted to investigate the behavior of High Carbon Steel (HCS) at different environmental temperatures. It was found that with increasing environmental temperature, the specimens tended to become more brittle, leading to a decrease in fatigue life.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Chemical
Soroosh Salehi, Sahar Ghatrehsamani, Saleh Akbarzadeh, M. M. Khonsari
Summary: This paper presents an experimental procedure and a thermodynamic methodology for evaluating adhesive wear in systems with variable and sequential speeds. The continuum damage mechanics (CDM) is used to estimate the probability of asperities forming wear particles and derive the wear coefficient. The results show that the wear coefficient in descending cases is higher than in ascending velocity experiments. Additionally, Archard's law is not suitable for predicting wear volume in situations with variable speeds.
Article
Physics, Multidisciplinary
Mohammad A. Amooie, K. P. Lijesh, Ali Mahmoudi, Elaheh Azizian-Farsani, Michael M. Khonsari
Summary: The effect of sudden variations in working modes and fatigue behavior of CS 1018 is studied using a general model based on the concept of fracture fatigue entropy (FFE). Fully reversed bending tests are conducted on dog bone specimens with variable frequency tests to simulate fluctuating working conditions. The results show that regardless of frequency changes, FFE remains constant and within a narrow band range, similar to a constant frequency.
Article
Engineering, Mechanical
Mohammad A. Amooie, M. M. Khonsari
Summary: This study investigates the fracture behavior of carbon steel 1018 in low-temperature environments. Fully-reversed bending experimental tests were performed to examine the efficacy of using Fracture Fatigue Entropy (FFE) concept for predicting fatigue life at different environmental temperatures. The results show that lower operating temperatures can improve fatigue life of carbon steel. Additionally, FFE remains nearly constant and can be used for reliable prediction of fatigue life at different environmental temperatures. Illustrative examples are provided to demonstrate the utility of this approach for prediction purposes.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Mechanics
A. Mahmoudi, M. R. Khosravani, M. M. Khonsari, Tamara Reinicke
Summary: This study investigates the accumulated entropy at the crack tip of a semi-circular bending (SCB) specimen to determine the threshold for material fracture and interatomic debonding. The plastic flow at the crack tip is measured using the Digital Image Correlation (DIC) technique and strain maps superposed to SCB specimens. The generated entropy at the crack tip reaches a critical limit, beyond which bond breakage occurs, leading to crack surface propagation.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Ali Mahmoudi, Mohammad A. Amooie, Lijesh Koottaparambil, Michael M. Khonsari
Summary: This study introduces a reliable technique for predicting the remaining useful life of components by measuring the temperature signature when the operating frequency is rapidly changed. The approach is validated through fatigue tests on stainless steel specimens. The method allows for predicting the remaining useful life at different operating frequencies.
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)
