Article
Materials Science, Multidisciplinary
D. F. Shi, Z. J. Zhang, Y. H. Yang, Y. Z. Zhou, R. Liu, P. Zhang, Z. F. Zhang
Summary: Nickel-based single-crystal superalloys are widely used in manufacturing aeroengine turbine vanes due to their excellent high-temperature performance. However, the presence of low-angle grain boundaries (LAGBs) during their manufacture can weaken the mechanical properties of the superalloys. In this study, the relationship between grain boundary misorientation (GBM) and fatigue properties of superalloys at elevated temperatures was systematically investigated using six different bicrystals with varying tilt LAGBs. The study found that an increase in GBM led to an increase in GB precipitates and cast micropores, resulting in a decrease in fatigue life and fatigue strength. The study also established a quantitative fatigue strength prediction model and evaluated the coupling effect of cast micropores and GBM on the fatigue damage mechanisms of the bicrystals.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Mechanical
J. Telesman, T. P. Gabb, P. T. Kantzos, P. J. Bonacuse, R. L. Barrie, C. A. Kantzos
Summary: In this study, crack initiation, crack coalescence, and small crack growth behavior of over 400 seeded inclusions in P/M Udimet 720 nickel disk alloy were monitored during interrupted low cycle fatigue testing at 650 degrees C. Two types of seeded alumina inclusions were used with average sizes of 54 μm and 122 μm, with fatigue behavior sub-categorized into four groups and detailed visual maps developed for inclusion size/cycle history. The effect of surface residual stresses on fatigue life was also investigated.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Ahmed Azeez, Viktor Norman, Robert Eriksson, Daniel Leidermark, Johan Moverare
Summary: Understanding crack growth behavior is crucial for accurate prediction of fatigue lives. Testing out-of-phase thermomechanical fatigue crack propagation on FB2 steel in high-temperature steam turbine sections showed the impact of crack closure on growth rate. The study also found that crack growth rate is mainly controlled by the minimum temperature of the cycle, and finite element models with stationary sharp cracks can capture crack closure behavior.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Review
Materials Science, Multidisciplinary
Leila Fathyunes, M. A. Mohtadi-Bonab
Summary: Gas turbines are widely used in various applications and play a significant role in sustainable energy generation. However, many turbines experience unexpected and catastrophic failure due to the synergistic effects of multiple damage mechanisms. This review paper investigates the damages caused by corrosion and fatigue in turbines, such as fatigue corrosion, hot corrosion and oxidation, and thermomechanical fatigue, emphasizing their combined effect. The mechanism of fatigue crack initiation and growth in corrosive environments is also examined. Furthermore, the influence of loading conditions, corrosive environment characteristics, and turbine material properties on this failure is summarized. Common methods for addressing corrosion fatigue damage, including surface treatment and cathodic protection, are briefly discussed.
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
Yiming Zheng, Bingbing Li, Jingwei Zhao, Caiming Liu, Takamoto Itoh, Xu Chen
Summary: Investigating fatigue crack growth behavior is crucial for the design and safety evaluation of engineering structures. In this study, a new thermomechanical fatigue (TMF) crack propagation testing method was developed for variable temperature conditions, and its validity was proven through a series of tests.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Mechanical
Iman Shakeri, Hilmar K. Danielsen, Adrien Tribhou, Soren Faester, Oleg Mishin, Martin A. Eder
Summary: This study investigates the impact of manufacturing defects induced by thread rolling on the high-cycle fatigue life of M30 class 10.9 stud bolts. The high-cycle fatigue tests of two batches of seemingly identical bolts reveal significant differences in fatigue performance. Scanning electron microscopy characterization shows a clear correlation between the defect size, in the form of rolling-induced microcracks in the thread root, and the fatigue life of the investigated bolts. Numerical fatigue analysis agrees well with experimental data. Electron backscatter diffraction is used to determine the characteristic length of microstructurally short defects in the tempered martensite microstructure. These results shed light on the critical manufacturing defect sizes in bolts, which is an essential parameter for quality control in the manufacturing process.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Ahmed Azeez, Robert Eriksson, Viktor Norman, Daniel Leidermark, Johan Moverare
Summary: Exploring crack growth behavior is crucial for accurate fatigue life predictions. In this study, cracked specimens were tested under strain-controlled out-of-phase thermomechanical fatigue conditions. Higher minimum temperature resulted in faster crack growth rates, while the addition of dwell times showed no significant effects. Crack closure was observed in all tests, and the addition of dwell times and change in minimum temperature had little to no effect on crack closure stresses.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
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
Jiawei Wang, Tao Guo, Kewei Gao, Xiaolu Pang
Summary: The effect of different diffusion-resistance bond coats on the fatigue performance of second-generation single crystal superalloys was investigated in this study. The beta-(Ni,Pt)Al coating decreased the fatigue performance of the substrate, while the gamma ' coating improved it. Oxidation is the most important factor leading to fatigue failure of the bond coat at high temperature.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
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
Chemistry, Physical
Jianxing Mao, Zhixing Xiao, Dianyin Hu, Xiaojun Guo, Rongqiao Wang
Summary: This paper systematically investigates the creep-fatigue crack growth behavior of the nickel-based superalloy GH4720Li under different temperature, stress ratio, and dwell time conditions. A concise binomial crack growth model is proposed and validated, which accurately predicts the experimental data.
Article
Engineering, Mechanical
D. Martinez de Luca, A. R. Hamilton, P. A. S. Reed
Summary: In this study, Inconel 718 manufactured by Laser Powder Bed Fusion was characterized in terms of microstructure, post-processing heat treatment, and the dependence of fatigue crack growth (FCG) on build orientation. Long crack fatigue tests were conducted at different temperatures and frequencies. It was found that at 350 degrees C, build orientation had no effect on FCG rates, but at higher temperatures, build orientation significantly affected FCG rates due to microstructural differences caused by the printing strategy.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Shiyu Suzuki, Motoki Sakaguchi, Masaya Domen, Takanori Karato, Kenta Suzuki
Summary: The effects of grain boundaries on fatigue crack propagation in a cast Ni-base superalloy were investigated. The study found that grain boundaries can retard the propagation of shear cracks and accelerate the propagation of cracks along high angle boundaries. Secondary cracks can also be nucleated along high angle boundaries.
Article
Nanoscience & Nanotechnology
L. C. Zhang, R. Jiang, Y. C. Wang, L. Zhang, J. T. Liu, Y. W. Zhang, Y. D. Song
Summary: This study investigates the short fatigue crack propagation behavior of a powder metallurgy superalloy (FGH4098) for aeroengine turbine disc application. The results show that the grain boundary oxidation has a significant influence on the crack propagation, and the temperature has a more evident effect on the fine-grained FGH4098 compared to the coarse-grained FGH4098.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
A. T. Radzicki, W. S. Johnson, R. W. Neu, B. S. Annigeri, B. M. Ziegler
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2017)
Article
Engineering, Mechanical
B. C. Clark, G. M. Castelluccio, M. W. Reiterer, D. L. McDowell, R. W. Neu
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2019)
Article
Engineering, Mechanical
Ernesto A. Estrada Rodas, Richard W. Neu
INTERNATIONAL JOURNAL OF PLASTICITY
(2018)
Article
Materials Science, Multidisciplinary
Thomas C. Winter, Richard W. Neu, Preet M. Singh, Lynne E. Kolaya, Chaitanya S. Deo
JOURNAL OF NUCLEAR MATERIALS
(2018)
Article
Engineering, Mechanical
Michael R. Hirsch, Robert L. Amaro, Stephen D. Antolovich, Richard W. Neu
INTERNATIONAL JOURNAL OF FATIGUE
(2014)
Article
Engineering, Mechanical
S. D. Neal, R. W. Neu
JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME
(2014)
Article
Engineering, Mechanical
M. M. Kirka, D. J. Smith, R. W. Neu
JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME
(2014)
Article
Materials Science, Multidisciplinary
S. Gorgannejad, M. Reisi Gahrooei, K. Paynabar, R. W. Neu
Article
Engineering, Mechanical
Ernesto A. Estrada Rodas, Sanam Gorgannejad, Richard W. Neu
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2019)
Letter
Engineering, Mechanical
Youshi Hong, Luca Susmel, Filippo Berto, Richard W. Neu, Masahiro Endo
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2019)
Article
Engineering, Mechanical
Morris Satin, W. Steven Johnson, Richard W. Neu, Balkrishna Annigeri, Brett Ziegler, Raymond Keith Kersey
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2020)
Article
Engineering, Mechanical
Chuchu Zhang, Richard W. Neu
Summary: This paper proposes a novel way to understand the role of glaze layer in reducing friction and wear on metal material systems undergoing fretting/sliding at elevated temperatures. Using computer vision algorithms, the study develops workflows for quantitative glaze layer identification and image alignment, demonstrating that the glaze layer can reduce friction and wear by reducing real contact area.
Article
Engineering, Mechanical
Chuchu Zhang, Richard W. Neu
Summary: A systematic experimental investigation is conducted to understand the effect of temperature and cycling frequency on the friction and wear behavior of high-Cr, high-Ni heat-resistant austenitic stainless steel 310S under gross slip fretting wear. The study uses a cylinder-on-flat contact configuration with temperatures ranging from 20°C to 700°C and cycling frequencies ranging from 1 Hz to 50 Hz. The results provide insights into the severe-to-mild wear transition and the establishment of an effective glaze layer protection.
Proceedings Paper
Engineering, Mechanical
Michael M. Kirka, Sachin R. Shinde, Phillip W. Gravett, Richard W. Neu
11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2
(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)