Article
Engineering, Multidisciplinary
Dengliang Wang, Lu Chen, Yongliang Zhao, Weixiong Chen, Chaoyang Wang, Junjie Yan
Summary: This study focuses on the fatigue lifetime evaluation of main components within coal-fired power plants. The dynamic characteristics and equivalent thermomechanical stresses under different load cycling rates are obtained. The fatigue lifetimes of main components are evaluated based on the ASME design fatigue evaluation code.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Engineering, Mechanical
Rohan Acharya, Alexander N. N. Caputo, Richard W. W. Neu
Summary: This paper explores the use of a neural network with a probabilistic physics-guided architecture to learn the relationships between parameters and fatigue life in various creep-fatigue and thermomechanical fatigue histories and predict cycles to failure. The model is evaluated to determine its success in learning the relationship between applied TMF histories and cycles to failure.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Mikael Segersall, Dunyong Deng
Summary: The study reveals that there is no significant difference in fatigue lives between in-phase and out-of-phase thermomechanical fatigue of a single-crystal superalloy, with localized deformation bands being the main deformation mechanism and crack initiation preferred in these bands. Other TMF mechanisms, such as recrystallization and oxidation, are also discussed.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
J. Telesman, T. P. Gabb, P. T. Kantzos, L. J. Ghosn
Summary: The study examined the influence of various broaching machining parameters on the high temperature fatigue lives of a nickel-based disk alloy, quantifying the effects of tool wear and broaching speed on residual stresses, cold work, and surface roughness. These variables were found to have a substantial impact on fatigue lives, failure mode types, and fatigue crack initiation mechanisms. Statistical analyses were used to evaluate these relationships.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Editorial Material
Engineering, Mechanical
Aleksandar Sedmak, Valery Shlyannikov, Jose Correia, Virginia Infante
Summary: The 1st Virtual European Conference on Fracture (VECF1) brought together over 300 researchers worldwide, presenting more than 320 papers. The event, organized through multiple symposia, saw a significant increase in views and positive feedback.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
Wen-Ping Wu, Zi-Jun Ding, Yun-Li Li, Chao Yu, Guozheng Kang
Summary: The thermomechanical fatigue (TMF) properties of Ni-based single crystal superalloys are studied using molecular dynamics simulations. Two different cyclic deformation mechanisms are identified. Under Out-of-phase TMF loading, the samples exhibit a higher cyclic stress range, plastic strain energy density, and shorter fatigue life compared to In-phase TMF loading. The low-temperature tension half-cycle is found to result in earlier failure due to dislocation and stacking fault penetration into the precipitate phase, attracting more attention in actual operation.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Kaiju Lu, Ankur Chauhan, Fabian Knopfle, Jarir Aktaa
Summary: Effective stress and back stress are higher upon cycling a HEA compared to conventional FCC steel, contributing to the HEA's higher cyclic strength. Back stress predominantly originates the cyclic stress response of the HEA, with significant increases observed with increasing strain amplitude and reducing grain size. However, the change of effective stress is rather insignificant with altering cycle number, strain amplitude, and grain size.
MATERIALS RESEARCH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Zhiqiang Xu, Yunxian Cui, Baoliang Li, Ketong Liu, Feiting Shi, Peng Cao
Summary: This study conducted a fatigue test on flange shafts to investigate the failure mode and the impact of initial crack angle on crack propagation. The analysis program developed in this study provided insights into the characteristics of crack propagation. The study revealed that the initial crack at the shaft-flange junction propagated in radial and axial directions and followed a mixed mode pattern. The crack propagation had three stages: rapid growth, steady decline, and instability. The findings emphasized the importance of considering the initial crack angle in determining the propagation rate and fatigue life distribution.
Article
Engineering, Mechanical
Pengfei Jin, Xin Wang, Haoruo Chen, Zheng Liu, Xu Chen
Summary: This paper investigates the variations of stress field parameters, including stress intensity factors (SIFs), T-stresses, and crack-mouth-opening-displacement (CMOD) compliance, in CTS specimens with slanted propagating cracks through finite element (FE) analysis. The results show that KI, KII, and T11 are greatly influenced by the initial crack length ratio, the slanted propagating crack length ratio, and the loading angle. T33, as an out-of-plane constraint parameter, is subject to the coupling effects of in-plane geometries, out-of-plane geometries, and mixed-mode loading. Moreover, the measurement span has an effect on CMOD-compliance results for CTS specimens under mixed-mode loading, but only within the recommended range. The accuracy of the developed CMOD-compliance equations is validated through fatigue crack growth (FCG) experiments.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Abdul Haseeb Afridi, Hongtao Zhu, Eduardo Tovar Camacho, Guanyu Deng, Huijun Li
Summary: Rolling contact fatigue (RCF) crack is a dominant form of damage on rail surfaces caused by repeated contact with wheels. If left untreated, RCF defects such as squats and head checks can lead to rail fractures. Accurately predicting the damage under different operational conditions is crucial. A two-stage simulation strategy was proposed, investigating the mechanisms of RCF-induced cracks on rails through dynamic FEM for wheel-rail interaction and coupled static FEM/BEM for crack growth. The study found two critical wheel positions for crack propagation during wheel approach and departure from pre-existing cracks.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Mechanical
J. M. Alegre, I. I. Cuesta, A. Diaz
Summary: This paper presents stress-intensity factor solutions for an embedded elliptical crack in a round bar under tensile load. The solutions were obtained from finite-element analyses and validated through comparison with experimental results.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Optics
Xiang Zhang, Jianping Peng, Qian Zhang, Kang Tian, Siying Tang, Xiao Liang, Tianxiang Wang, Xiaorong Gao
Summary: This study investigates the use of induced scanning thermography (IST) for detecting rolling contact fatigue (RCF) defects at different depths. A data reconstruction method involving principal component analysis (PCA) and 'flicker factorization' is employed to extract spatial and time patterns. The detectability is evaluated across a range of speeds. The 'Ricker-PCA combination algorithms' achieve improved defect detection with a clear boundary over the velocity range of 1-4km/h, and a unique gradient response characteristic in the cooling phase is utilized to recognize defect width.
Article
Materials Science, Multidisciplinary
Peng Yin, Wei Zhang, Yi Zhang, Qiaofa Yang, Fei Liang, Le Chang, Changyu Zhou
Summary: The thermomechanical fatigue behavior of 316L was investigated by analyzing internal stress and microstructural characteristics at different cyclic stages. The results showed that cyclic stress response exhibited initial hardening followed by cyclic softening at high strain amplitudes, while continuous cyclic hardening was observed as the strain amplitude decreased. Out-of-phase TMF always resulted in cyclic softening regardless of strain amplitude. The contributions of back stress and friction stress to initial and subsequent cyclic hardening were highlighted. The hardening of back stress and friction stress was attributed to dislocation proliferation at grain boundaries and increased dislocation interactions within grains, respectively. The cyclic softening of friction stress was attributed to the annihilation of dislocations due to cross-slip. The hysteresis curves revealed that the intensity of dynamic strain aging depended on strain amplitude, loading history, and phase angle, which were related to cross-slip occurrence, solute atom diffusion rate, point defect density, and vacancy mobility. The effect of loading conditions on fracture behavior, including crack sources, secondary cracks, creep cavities, and oxidation damage, was demonstrated.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Construction & Building Technology
Meng Hu, Rongshan Yang
Summary: By establishing a hydraulic fracturing model of twinblock sleeper and conducting laboratory tests, it was found that the hydrodynamic pressure in cracks varies under different conditions, with crack opening being a sensitive factor affecting both hydrodynamic pressure and effective stress intensity. The initial crack length is identified as the main factor influencing the fatigue life of cracks.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Jaejin Jeon, Jihwan Seong, Jangmuk Lim, Min Ki Kim, Taehwa Kim, Sang Won Yoon
Summary: This article explores the role of metal spacer design in reducing thermomechanical stress in solder joints in automotive double-sided cooling power electronics modules. The study compared three new spacer shapes and found that an octagon-surface spacer demonstrated the best solder reliability compared to other designs. Validation was done through both Finite Element Method (FEM) simulations and thermal cycling experiments.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Albert Manero, Stephen Sofronsky, Kevin Knipe, Carla Meid, Janine Wischek, John Okasinski, Jonathan Almer, Anette M. Karlsson, Seetha Raghavan, Marion Bartsch
Article
Engineering, Mechanical
Kevin Knipe, Albert C. Manero, Stephen Sofronsky, John Okasinski, Jonathan Almer, Janine Wischek, Carla Meid, Anette Karlsson, Marion Bartsch, Seetha Raghavan
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2015)
Article
Nanoscience & Nanotechnology
M. R. Kabir, M. Bartsch, L. Chernova, K. Kelm, J. Wischek
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2015)
Article
Materials Science, Coatings & Films
Albert Manero, Alex Selimov, Quentin Fouliard, Kevin Knipe, Janine Wischek, Carla Meid, Anette M. Karlsson, Marion Bartsch, Seetha Raghavan
SURFACE & COATINGS TECHNOLOGY
(2017)
Article
Instruments & Instrumentation
Sanna F. Siddiqui, Kevin Knipe, Albert Manero, Carla Meid, Janine Wischek, John Okasinski, Jonathan Almer, Anette M. Karlsson, Marion Bartsch, Seetha Raghavan
REVIEW OF SCIENTIFIC INSTRUMENTS
(2013)
Article
Multidisciplinary Sciences
Kevin Knipe, Albert Manero, Sanna F. Siddiqui, Carla Meid, Janine Wischek, John Okasinski, Jonathan Almer, Anette M. Karlsson, Marion Bartsch, Seetha Raghavan
NATURE COMMUNICATIONS
(2014)
Article
Materials Science, Multidisciplinary
Albert Manero, Kevin Knipe, Janine Wischek, Carla Meid, John Okasinski, Jonathan Almer, Anette M. Karlsson, Marion Bartsch, Seetha Raghavan
Article
Materials Science, Multidisciplinary
Carla Meid, Mario Eggeler, Philipp Watermeyer, Aleksander Kostka, Thomas Hammerschmidt, Ralf Drautz, Gunther Eggeler, Marion Bartsch
Article
Nanoscience & Nanotechnology
Carla Meid, Anne Dennstedt, Markus Ramsperger, Julian Pistor, Benjamin Ruttert, Inmaculada Lopez-Galilea, Werner Theisen, Carolin Koerner, Marion Bartsch
SCRIPTA MATERIALIA
(2019)
Article
Materials Science, Multidisciplinary
C. Dresbach, J. Wischek, M. Bartsch, T. Prien
Summary: This research develops a creep model based on experimental results and literature values to predict the lifetime of turbine blades in jet engines under real loading conditions.
MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK
(2022)
Article
Materials Science, Ceramics
Stefan Hackemann, Marion Bartsch
CERAMICS-SWITZERLAND
(2019)
Article
Neurosciences
U. Mittag, A. Kriechbaumer, M. Bartsch, J. Rittweger
JOURNAL OF MUSCULOSKELETAL & NEURONAL INTERACTIONS
(2015)
Article
Materials Science, Ceramics
Kevin Knipe, Albert Manero, Sanna F. Siddiqui, Carla Meid, Janine Wischek, John Okasinski, Jonathan Almer, Anette M. Karlsson, Marion Bartsch, Seetha Raghavan
AMERICAN CERAMIC SOCIETY BULLETIN
(2015)
Proceedings Paper
Automation & Control Systems
Kevin Knipe, Albert C. Manero, Stephen Sofronsky, John Okasinski, Jonathan Almer, Janine Wischek, Carla Meid, Anette Karlsson, Marion Bartsch, Seetha Raghavan
PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2014, VOL 6
(2014)
Proceedings Paper
Materials Science, Multidisciplinary
M. R. Kabir, M. Bartsch, L. Chernova, J. Schneider, K. Kelm
ADVANCED MATERIALS SCIENCE AND TECHNOLOGY, (IFAMST-8)
(2013)
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)