Article
Nanoscience & Nanotechnology
R. M. Flanagan, M. A. Meyers, S. M. Valone, S. J. Fensin
Summary: The mechanisms responsible for the collapse of helium-filled bubbles during the passage of shock waves in monocrystalline copper are revealed. Both empty and helium-filled bubbles serve as dislocation sources, generating intense, localized plastic regions. There are distinct differences in the collapse of empty voids compared to He-filled bubbles, the former requiring less stress and generating a greater density of dislocations for a given shock strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Adrienne Muth, Reji John, Adam Pilchak, Surya R. Kalidindi, David L. McDowell
Summary: This study examines the use of Fatigue Indicator Parameters (FIPs) in Ti-6Al-4V, showing that fatigue crack formation is predominantly influenced by alpha-phase grains in the High Cycle Fatigue (HCF) regime.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Adrienne Muth, Reji John, Adam Pilchak, Surya R. Kalidindi, David L. McDowell
Summary: This study utilizes extreme value statistics to model Fatigue Indicator Parameters, capturing fatigue crack formation mechanisms and early growth stages to evaluate resistance to fatigue in Ti-6Al-4V microstructures. The statistical volume element ensemble approach and peaks-over-threshold method are used to rank microstructures based on their resistance to fatigue crack formation. Microstructure attributes such as grain size, orientation, and nearest neighbor arrangements are quantified in FIP 'hot spots'.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Aaditya Lakshmanan, Mohammadreza Yaghoobi, Krzysztof S. Stopka, Veera Sundararaghavan
Summary: A computational framework is developed to incorporate grain size and morphology effects in the crystal plasticity finite element method. The framework reveals the significant influence of grain size and morphology on yield strength and extreme value fatigue response. The developed framework is important for simulations of polycrystalline microstructure models with significant grain morphology anisotropy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Mechanical
Huamiao Wang, Xiaodan Zhang, Wei Wu, Peter K. Liaw, Ke An, Qin Yu, Peidong Wu
Summary: Extensive attention has been given to magnesium (Mg) alloys as potential lightweight structural materials. However, the processing and manufacturing of Mg materials with high strength and good ductility remain challenging. This is mainly due to a lack of understanding of the anisotropic mechanical behavior of Mg alloys under multiaxial stress states. In this study, the torsional and coupled torsion-tension/compression behaviors of a magnesium alloy subjected to large-strain deformation were investigated. Experimental validation was conducted and a model was proposed to capture the complex behavior of Mg alloys under different loading conditions. The findings of this study provide insights for designing and optimizing the properties of Mg alloys.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Krzysztof S. S. Stopka, Mohammadreza Yaghoobi, John E. E. Allison, David L. L. McDowell
Summary: Assessing the size of representative volume elements (RVEs) for fatigue-related applications is challenging. The present study aims to systematically investigate the trends of convergence in the simulated distribution of driving force for fatigue crack formation as a function of the size of a statistical sample of microstructure. The results show that the simulated RVE of polycrystalline microstructure using crystal plasticity finite element method converges with tens of thousands of grains, while larger volumes are required for random and rolled textures.
Article
Engineering, Mechanical
Krzysztof S. Stopka, Mohammadreza Yaghoobi, John E. Allison, David L. McDowell
Summary: This study examines the effects of surface roughness on the driving force for fatigue crack formation using microstructure-sensitive computational models. The depth of a single valley due to surface roughness is found to have a larger impact on fatigue resistance than the radius, and factors such as crystallographic textures, grain morphologies, and number of sampled grains have a limited effect on the depth of influence of these notches.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Hang Li, Chao Yu, Guozheng Kang
Summary: The non-proportional multiaxial ratchetting behavior of extruded AZ31 Mg alloy was investigated through macroscopic experimental observations and corresponding microscopic investigations. A constitutive model was developed to capture the plastic deformation mechanisms and the evolution of back stresses during the ratchetting process. The developed model successfully reproduced the non-proportional multiaxial ratchetting behavior of the AZ31 Mg alloy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Geological
Hanbeen Kim, Jung-Hyun Lee, Hyuck-Jin Park, Jun-Haeng Heo
Summary: The study highlights the significant impact of climate change on landslide occurrence and proposes a new nonstationary approach to assess future landslide probabilities. Compared with traditional stationary methods, the nonstationary approach provides better results by considering trends in climate change that are overlooked in stationary analysis.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Niloofar Mehrnia, Sinem Coleri
Summary: This paper proposes a framework based on extreme value theory for determining the rate selection for ultra-reliable communications. By modeling the wireless channel and incorporating statistical data, the best fitting parameters for the tail distribution are estimated and integrated into the rate selection function. The selected rate is validated by computing the error probability.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Mechanics
Qingcheng Yang, Somnath Ghosh
Summary: An efficient and effective crystal plasticity model is proposed for porous HCP crystals, which is validated through RVE studies.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Green & Sustainable Science & Technology
Hyuck-Jin Park, Kang-Min Kim, In-Tak Hwang, Jung-Hyun Lee
Summary: Accurate assessment of landslide hazards is crucial for reducing casualties and damage. This study adopts a physically based approach with probabilistic analysis to estimate the spatial distribution of landslide probability, and proposes an indirect approach based on rainfall frequency to estimate temporal probability. Nonstationary characteristics of rainfall data are also considered.
Article
Nanoscience & Nanotechnology
Zu Li, Meng Zhang, Tao Zhang
Summary: This study investigates the mechanisms of vibration-facilitated plastic deformation in metallic materials through tensile tests on copper single crystal foils under low-frequency vibrational loading. The experimental results show that increasing vibration frequency enhances the plastic deformability of the copper foils, which can be explained by the formation of equiaxial dislocation cells.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Shipin Qin, Zhuqing Wang, Allison M. Beese
Summary: The plasticity and ductile fracture behavior of stainless steel 304L fabricated by laser powder bed fusion additive manufacturing was found to be anisotropic and stress state dependent. An anisotropic Hill48 plasticity model, calibrated using experimental data, accurately captured this behavior. Additionally, an anisotropic Hosford-Coulomb model was used to capture the anisotropic and stress state dependent fracture behavior through a combined experimental-computational approach.
EXTREME MECHANICS LETTERS
(2021)
Article
Engineering, Civil
B. T. Zheng, J. G. Teng
Summary: Confined concrete structural members are popular in civil engineering due to superior strength and ductility. This paper presents a 3D plasticity constitutive model accurate in predicting stress-strain behavior under various confinement scenarios, combining an open strength surface and a novel potential surface. The model shows capability and high accuracy in multiple experimental conditions.
ENGINEERING STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Khalil Refai, Marco Montemurro, Charles Brugger, Nicolas Saintier
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2020)
Article
Engineering, Mechanical
Alexandre Messager, Arnaud Junet, Thierry Palin-Luc, Jean-Yves Buffiere, Nicolas Saintier, Nicolas Ranc, Mohamed El May, Yves Gaillard, Andrew King, Anne Bonnin, Yves Nadot
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2020)
Article
Engineering, Mechanical
Matthieu Bonneric, Charles Brugger, Nicolas Saintier
INTERNATIONAL JOURNAL OF FATIGUE
(2020)
Article
Engineering, Mechanical
Aleksander Karolczuk, Jan Papuga, Thierry Palin-Luc
INTERNATIONAL JOURNAL OF FATIGUE
(2020)
Article
Materials Science, Composites
E. Boissin, C. Bois, J-C Wahl, T. Palin-Luc
JOURNAL OF COMPOSITE MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Camille Rousseau, Abdelali Oudriss, Remy Milet, Xavier Feaugas, Mohamed El May, Nicolas Saintier, Quentin Tonizzo, Mariem Msakni-Malouche
SCRIPTA MATERIALIA
(2020)
Editorial Material
Engineering, Mechanical
Andrea Carpinteri, Masahiro Endo, Franck Morel, Thierry Palin-Luc, Michael Vormwald
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2020)
Article
Engineering, Mechanical
Olivier Andreau, Etienne Pessard, Imade Koutiri, Patrice Peyre, Nicolas Saintier
Summary: Optimized 316L steel samples manufactured using laser powder bed fusion were tested for high cycle fatigue at R = 0.1, showing outstanding fatigue properties. Additional fatigue tests on samples with deterministic defects of various sizes and positions revealed that the critical defect size is around 20 μm for surface defects and up to 380 μm for internal pores. Fracture surface analysis suggested that the large size discrepancy between surface and internal fatigue crack initiation could be attributed to the local gaseous environment in the pores.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Zaid Boussattine, Nicolas Ranc, Thierry Palin-Luc
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2020)
Article
Engineering, Mechanical
Eileen Boissin, Christophe Bois, Jean-Christophe Wahl, Thierry Palin-Luc, Damien Caous
Summary: This study demonstrated that the temperature dependency of composite transverse and off-axis mechanical behavior can be succinctly determined by considering the temperature dependency of the matrix initial elastic properties. This is a relevant finding for designing composite structures with a limited set of experimental data.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
N. Ranc, A. Messager, A. Junet, T. Palin-Luc, J. Y. Buffiere, N. Saintier, M. Elmay, L. Mancini, A. King, Y. Nadot
Summary: This paper aims to study the initiation and propagation of internal cracks in very high cycle fatigue fractures. By using infrared thermography to measure the surface temperature field during an ultrasonic fatigue test, a relationship between the internal crack growth and temperature field evolution on the specimen surface can be established.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Mechanical
Pablo Wilson, Nicolas Saintier, Thierry Palin-Luc, Bruno Sudret, Sebastien Bergamo
Summary: This study investigates the characteristics of defects in cast materials and their impact on material fatigue performance using statistical tools. The results demonstrate that the defects are clustered and there is no significant link between the size of the defect and its location.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
Louis Hebrard, Jean-Yves Buffiere, Thierry Palin-Luc, Nicolas Ranc, Marta Majkut, Andrew King, Arnaud Weck
Summary: In this study, physically short fatigue cracks initiated from an artificial internal notch under vacuum conditions are observed in smooth specimens made of titanium alloy. The role of environment in the explanation of the low crack growth rate of internal short crack loaded at very low stress amplitude leading to the gigacycle regime is examined. Ultrasonic cycling and synchrotron micro-computed tomography acquisitions were used to analyze the number of cycles to failure, the internal crack growth rate, and the crack growth mechanisms of internal cracks under different conditions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
G. Lafoy, J. Bergon, K. Aouati, R. Kling, T. Palin-Luc
HIGH-POWER LASER MATERIALS PROCESSING: APPLICATIONS, DIAGNOSTICS, AND SYSTEMS IX
(2020)
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)