Article
Materials Science, Multidisciplinary
C. Lavogiez, C. Dureau, Y. Nadot, P. Villechaise, S. Hemery
Summary: The fatigue behavior of Ti-6Al-4V with a bi-modal microstructure was investigated using different waveforms, load ratios, and frequencies. It was found that cracks were initiated along (0001) twist grain boundaries, which is consistent with prior studies. The results also showed that the critical microstructural configurations were not sensitive to environmental factors, free surfaces, loading conditions, and microstructure and composition.
Article
Engineering, Mechanical
Anastasios G. Gavras, Anthony G. Spangenberger, Diana A. Lados
Summary: A study was conducted on the long and small fatigue crack growth mechanisms of various light structural aluminum and titanium alloys, leading to the development of a predictive model for microstructurally controlled small fatigue crack growth behavior, which agrees well with experimental data.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Zhihong Wu, Hongchao Kou, Nana Chen, Zhixin Zhang, Fengming Qiang, Jiangkun Fan, Bin Tang, Jinshan Li
Summary: The study investigated the effect of microstructure features on the high-cycle fatigue behavior of Ti-7Mo-3Nb-3Cr-3Al (Ti-7333) alloy. It was found that fatigue strength is closely related to microstructure features, especially the alpha(p) percentage. The alloy with lower alpha(p) percentage exhibited higher scatter in fatigue data and bimodal fatigue behavior.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Crystallography
Baohua Nie, Yu Song, Xianyi Huang, Haiying Qi, Zihua Zhao, Dongchu Chen
Summary: In this paper, the low cycle fatigue (LCF) behaviors of TC21 alloy with a bi-lamellar basketweave microstructure were investigated. The cyclic stress-strain as well as the strain-life equations were obtained. The fatigue life decreased significantly with an increasing total strain, and the cyclic softening behavior was interpreted by cyclic back stress and friction stress.
Article
Materials Science, Multidisciplinary
Huiping Wu, Dayong An, Tianle Li, Wentao Ye, Xifeng Li, Jun Chen
Summary: The fatigue crack propagation behavior of diffusion-bonded heterogeneous TA2/Ti55/TA2 laminate was studied. Delta phase precipitates were formed in TA2 during diffusion bonding process. Adjacent delta grains exhibited a common {1 1 0} pole. The common orientation relationship between alpha and delta grains is {1120}HCP// {1 1 0}FCC. The presence of delta phase and secondary cracks contributed to the reduction of fatigue crack growth rate in TA2. The high strength and abundant alpha/beta interfaces in the Ti55 interlayer led to a significant decrease in fatigue crack growth rate.
Article
Nanoscience & Nanotechnology
Motoki Sakaguchi, Yoshinori Niwa, Wenxiang Gong, Keisuke Suzuki, Hirotsugu Inoue
Summary: The study found that at high temperatures, the fatigue crack growth resistance of the triplex microstructure is significantly increased, mainly due to the higher volume fraction of ductile p phase. Meanwhile, the fatigue crack growth threshold in different microstructures and temperatures is almost comparable and shows the same temperature dependency.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
B. Fernandez Silva, J. Kawalko, K. Muszka, M. Jackson, K. Fox, B. P. Wynne
Summary: This paper investigates the formation and deformation mechanisms of quasi-cleavage facets in dwell fatigue in a bimodal titanium alloy. It identifies basal slip as the critical damage mode leading to dwell fatigue failure and presents a possible criterion for slip transfer.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Nanoscience & Nanotechnology
Zhandong Wang, Shibin Wang, Kun Yang, Mingzhi Chen, Kedong Bi, Zhonghua Ni, Guifang Sun
Summary: The microstructurally short fatigue crack initiation and growth behaviors of Ti-6Al-4V repaired by Underwater Directed Energy Deposition (UDED) were studied, and compared with those of Ti-6Al-4V repaired by In-Air Directed Energy Deposition (DED). The results showed that the UDED-repaired Ti-6Al-4V had alpha' martensite as the dominant microstructure, while the in-air DED-repaired Ti-6Al-4V had alpha+beta due to heat treatment. The UDED-repaired Ti-6Al-4V had higher strength and microhardness compared to the in-air DED-repaired Ti-6Al-4V. However, the UDED-repaired Ti-6Al-4V had shorter micro crack initiation time and poorer fatigue crack propagation resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Abdul Khadar Syed, Xiang Zhang, Alec E. Davis, Jacob R. Kennedy, Filomeno Martina, Jialuo Ding, Stewart Williams, Philip B. Prangnell
Summary: The influence of three different deposition strategies on the fatigue crack growth behavior of WAAM Ti-6Al-4V was studied. The oscillation build exhibited the lowest crack growth rates and behaved more similarly to an annealed microstructure compared to the other two deposition strategies.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Crystallography
Baohua Nie, Shuai Liu, Xianyi Huang, Haiying Qi, Binqing Shi, Zihua Zhao, Dongchu Chen
Summary: The crack initiation, propagation, and damage behaviors of TC21 alloy with basketweave microstructure under low cycle fatigue (LCF) were investigated. The process of LCF damage was observed, and in-situ SEM fatigue analysis was conducted. The study found that LCF crack damage showed different sensitivity to cyclic stress, with different initiation and propagation patterns.
Article
Engineering, Mechanical
Litton Bhandari, Vidit Gaur
Summary: This study investigates the cyclic behavior and cold dwell sensitivity of additively manufactured Ti6Al4V alloy. Low cycle fatigue tests were conducted on specimens exposed to a dwell period, revealing a significant reduction in fatigue lives at lower strain amplitudes but similar lives at higher ones. Fractographic analysis identified multiple crack initiation regions, attributed to process-induced defects or facet formation in α laths. The study discusses the failure mechanism based on stress redistribution and relaxation.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Nanoscience & Nanotechnology
Hang Lv, Zhenlin Zhang, Yarong Chen, Yan Liu, Hui Chen, Yong Chen, Jing Cheng, Jian She, Huabing He, Jintao Chen
Summary: In this study, several large Ti-6Al-4V blocks were fabricated successfully using high-power laser metal deposition (HP-LMD). The high cycle fatigue (HCF) property and fatigue crack growth (FCG) behavior of the as-built Ti-6Al-4V alloy were investigated in horizontal and vertical directions. The results showed that the HCF performance of the vertical specimens was superior to the horizontal specimens, but inferior to the wrought Ti-6Al-4V. Additionally, the fatigue crack growth rate of the vertical specimens was lower than that of the horizontal specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Simon Pillmeier, Reinhard Pippan, Juergen Eckert, Anton Hohenwarter
Summary: Low Young's modulus 8-type titanium alloys, such as the Ti-45Nb alloy, have elastic properties close to that of human bone and contain non-toxic elements, making them highly desirable for load bearing implants. Severe plastic deformation methods, such as high pressure torsion, can significantly increase their relatively low hardness and strength. The fatigue crack growth behavior of Ti-45Nb in different microstructural states (as-received, HPT-deformed, HPT + cold-rolled, HPT + heat-treated) was investigated using compact tension specimens. The alloy exhibited weak anisotropy in the fatigue crack growth behavior, attributed to the transcrystalline fracture mode.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
J. Geathers, C. J. Torbet, J. W. Jones, S. Daly
Summary: Water vapor has a significant impact on the small fatigue crack growth rates in Ti-6242S alloy, with a linear dependence observed between crack growth rate and water vapor pressure. This work highlights the importance of humidity in determining fatigue life even at high cyclic frequencies.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
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
Materials Science, Multidisciplinary
J. C. Stinville, T. Francis, A. T. Polonsky, C. J. Torbet, M. A. Charpagne, Z. Chen, G. H. Balbus, F. Bourdin, V. Valle, P. G. Callahan, M. P. Echlin, T. M. Pollock
Summary: This study developed a methodology for conducting time-resolved digital image correlation in the SEM to analyze time-dependent mechanical deformation phenomena. Experimental investigation of microscope and electron beam scanning parameters that influence the rate at which time-resolved DIC information is mapped was conducted, and time-resolved DIC imaging was successfully demonstrated on a Ti-7Al alloy.
EXPERIMENTAL MECHANICS
(2021)
Article
Engineering, Mechanical
Yejun Gu, Jean Charles Stinville, Patrick G. Callahan, McLean P. Echlin, Tresa M. Pollock, Jaafar A. El-Awady
Summary: Fatigue crack initiation at high temperatures in polycrystalline nickel-base superalloys occurs at microscopic fatigue shear bands near twin boundaries with minimal metallurgical defects. Formation of fine-scale carbide precipitates along these fatigue shear bands during fatigue above 650 degrees C is observed, with pipe diffusion critical to their formation coincident with delocalization of slip during fatigue.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Jonathan Cappola, Jean-Charles Stinville, Marie-Agathe Charpagne, Patrick G. Callahan, McLean P. Echlin, Tresa M. Pollock, Adam Pilchak, Matthew Kasemer
Summary: The equiaxed microstructure of Ti-6Al-4V alloy contains alpha-phase grains of varying orientations. The presence of microtextured regions can adversely affect the mechanical properties of the alloy, particularly quasi-static and fatigue properties. Studies have shown that orientation spread within microtextured regions facilitates strain localization, and the intensity of microtexture in neighboring regions further influences the extent of strain localization.
Article
Materials Science, Multidisciplinary
Jonathan M. Hestroffer, Marat Latypov, Jean-Charles Stinville, Marie-Agathe Charpagne, Valery Valle, Matthew P. Miller, Tresa M. Pollock, Irene J. Beyerlein
Summary: This study investigates the evolution of intragranular lattice rotations and slip activity in a high performance, polycrystalline face centered cubic material during monotonic and cyclic loading using a combination of in-situ high-resolution digital image correlation (HR-DIC), Heaviside-DIC method (H-DIC), and crystal plasticity finite element (CPFE). The results show that most grains develop intragranular lattice rotation gradients that span the grain, regardless of their size and lattice orientation. The analysis of slip lines reveals agreement in the active slip systems and changes in local slip activity across individual grains. The findings suggest that deforming grains are divided into sub-granular regions of uniform lattice rotation, most often associated with one or two active slip systems.
Article
Materials Science, Multidisciplinary
J. C. Stinville, W. Ludwig, P. G. Callahan, M. P. Echlin, V. Valle, T. M. Pollock, H. Proudhon
Summary: This study enables imaging of bulk slip events within the 3D microstructure through the combined use of X-ray diffraction contrast tomography and topotomography. Correlative measurements were performed using various methods to validate the observation of slip events and significant differences were found between bulk and surface grains, highlighting the need for 3D observations to better understand deformation in polycrystalline materials.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Maxwell Pinz, George Weber, Jean Charles Stinville, Tresa Pollock, Somnath Ghosh
Summary: This paper develops a probabilistic crack nucleation model for the Ni-based superalloy Rene 88DT under fatigue loading using a Bayesian inference approach. The underlying mechanisms driving crack nucleation are identified through a data-driven, machine learning approach. Experimental fatigue-loaded microstructures are characterized to correlate the grain morphology and crystallography to the crack nucleation sites. A multiscale model, incorporating experimental polycrystalline microstructures, is developed for fatigue simulations.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Physics, Applied
E. Barraud, T. de Resseguier, J. Baillargeat, S. Hemery, J. Cormier
Summary: In this study, the dynamic behavior of a nickel-based superalloy under shock loading was investigated using laser-launched flyers. It was found that different microstructures and heat treatment conditions significantly influence the dynamic failure mechanisms.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Manufacturing
T. Yvinec, A. Nait-Ali, D. Mellier, D. Bertheau, J. Cormier, P. Villechaise, L. Rat, S. Hemery
Summary: In this study, the microstructure, porosity, and tensile properties of Ti-6Al-4V fabricated by laser metal deposition were characterized. It was found that while there was no significant anisotropy in strength, the ductility varied depending on the loading direction. An increase in ductility along the build direction was attributed to strain delocalization. Various factors such as crystallographic textures, grain morphology, distance to free surface, porosity, and shielding during manufacturing were also examined for their influence on the tensile properties.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
A. Huet, A. Nait-Ali, T. Giroud, P. Villechaise, S. Hemery
Summary: This study investigates strain localization behavior in high strength metastable beta titanium alloys and finds that the elastic anisotropy of the beta phase plays a crucial role in slip activity and strain localization, while the presence of the alpha phase also affects deformation behavior.
Article
Multidisciplinary Sciences
J. C. Stinville, M. A. Charpagne, A. Cervellon, S. Hemery, F. Wang, P. G. Callahan, V. Valle, T. M. Pollock
Summary: In this study, the physical origins of fatigue strength in metallic materials were investigated by observing the nanoscale deformation processes of individual materials at the earliest stages of cycling. The quantitative relationships between yield strength and other physical characteristics were identified, and a method for predicting fatigue strength based on slip localization amplitude was proposed.
Article
Materials Science, Multidisciplinary
C. Lavogiez, C. Dureau, Y. Nadot, P. Villechaise, S. Hemery
Summary: The fatigue behavior of Ti-6Al-4V with a bi-modal microstructure was investigated using different waveforms, load ratios, and frequencies. It was found that cracks were initiated along (0001) twist grain boundaries, which is consistent with prior studies. The results also showed that the critical microstructural configurations were not sensitive to environmental factors, free surfaces, loading conditions, and microstructure and composition.
Article
Engineering, Mechanical
Zhihong Wu, Hongchao Kou, Jinshan Li, Samuel Hemery, Nana Chen, Junhui Tang, Fengming Qiang, Fan Sun, Frederic Prima
Summary: Dwell fatigue failure of titanium alloy components has been a major threat to aircraft safety for the past 50 years. Designing a microstructure with low primary alpha phase content can achieve high strength and low sensitivity to dwell loading. Cracking occurs primarily along preexisting slip bands and twist grain boundaries. Load holding plays a significant role in crack initiation and switching of crack modes.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Coatings & Films
Samuel Lett, Aurelie Quet, Samuel Hemery, Jonathan Cormier, Erick Meillot, Patrick Villechaise
Summary: Cold spray as a new additive manufacturing process provides benefits for oxidation-sensitive materials like titanium alloys, but the challenge lies in achieving dense deposition due to high alloy strength. This study explores the sensitivity of deposition parameters and the application of in situ shot peening to reduce porosity. The presence of residual stresses is also addressed, aiming to provide guidelines for controlling porosity and residual stresses to produce dense and thick Ti-6Al-4V coatings with good structural integrity.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(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)
