Article
Materials Science, Multidisciplinary
Zilong Zhao, Peng Zhang, Shengzhi Li, Jie Zhang, Weidong Shi, Chuangju Zhang, Yefei Li, Jingbo Yan, Fang Yang, Chang Zhang
Summary: The fatigue-creep properties of Ni-Fe based superalloy under different conditions vary significantly, showing that increasing strain amplitude, temperature, and holding time all have an impact on fatigue cycles. Dislocations bypass second phase particles during deformation, and longer holding time leads to the growth of the second phase, ultimately exceeding the critical size for dislocation cutting.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Sungcheol Park, Yuya Tanaka, Saburo Okazaki, Yusuke Funakoshi, Hideto Kawashima, Hisao Matsunaga
Summary: Torsional fatigue testing on AM Alloy 718 revealed that microstructural features, including twist angle and tilt angle, played a significant role in crack growth behavior. The impact of precipitates on crack growth rate was found to be insignificant.
Article
Mechanics
Saburo Okazaki, Satoshi Okuma, Kevinsanny, Yuhei Ogawa, Hideto Kawashima, Yusuke Funakoshi, Hisao Matsunaga
Summary: The study investigated the interaction-effects of adjacent, circumferential V-notches on the fatigue limit of Alloy 718, and found that specimens with seven adjacent circumferential notches had lower fatigue limit than those with a single circumferential notch. This was attributed to the increased stress intensity factor range of shear-mode fatigue cracks at notch-roots, resulting from the competition between stress mitigation through the mechanistic interaction of notches and the orderly spatial alignment of crack-planes.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Metallurgy & Metallurgical Engineering
Xie Jun, Shu De-long, Hou Gui-chen, Yu Jin-jiang, Zhou Yi-zhou, Sun Xiao-feng
Summary: The study on low-cycle fatigue (LCF) behavior of K416B alloy at 650 degrees C reveals that the fatigue life of the alloy depends on its material strength, characterized mainly by elastic deformation. Deformation mechanism of the alloy in tension-compression fatigue involves dislocation slip reflected in a dislocation configuration similar to the Frawk-Reed source. During late stages of LCF, fatigue-induced cracks develop from the alloy surface and may propagate along regions of eutectic and bulk M6C carbide, leading to cleavage fracture.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Engineering, Mechanical
Lei Han, Yibing Wang, Yu Zhang, Cheng Lu, Chengwei Fei, Yongjun Zhao
Summary: The cracking behavior and microscopic mechanism of K403 superalloy turbine blade under Combined high and low Cycle Fatigue (CCF) conditions were studied. It was found that the crack initiation sites changed with increasing loads due to the competition and alliance of different microstructural factors and their interaction with grain boundaries. The role shift of high cycle fatigue in CCF led to the transformation of crack modes from transgranular to intergranular.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Yuya Tanaka, Sungcheol Park, Saburo Okazaki, Hisao Matsunaga
Summary: A novel strategy for evaluating the fatigue limit of Ni-based superalloy 718 is proposed based on fatigue tests and stress analysis.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Yipeng Chen, Weiwen Kong, Chao Yuan, Shuai Liu, Yong Cai, Yongqiang Wang, Xinyu Gao
Summary: The high-cycle fatigue behavior of wrought superalloy GH4742 was investigated at room temperature, 650 degrees C, and 750 degrees C. The fatigue strength at 107 cycles increases with temperature due to different fracture modes. Fatigue cracks originate from the specimen surface at room temperature, while at higher temperatures they originate from subsurface or internal crystallographic planes. The dislocation density and deformation mechanisms vary with temperature, involving APBs shearing, Orowan bypassing, and stacking faults shearing.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Quanfeng Xiao, Yuanming Xu, Xinling Liu, Xinghui Jia
Summary: This study investigates the high cycle fatigue behavior of a Ni-base single crystal super-alloy at 760 degrees C and 850 degrees C. At 760 degrees C, the crack grows in the crystallographic shearing mode and the crack tip propagation mechanism is non-crystallographic mode. When the temperature rises to 850 degrees C, recrystallization grains are observed in the fatigue initiation region, and the stress reduction leads to the increment of accumulative strain and the aggravation of recrystallization.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Kaustav Barat, Abhijit Ghosh, Alok Doharey, Shreya Mukherjee, Anish Karmakar
Summary: This study presents the microscale fracture mechanics aspects of non-propagating LCF cracks in cylindrical specimens of Ni based superalloy Haynes 282 and aims to uncover the underlying crystallographic factors. Two key parameters, Crack Tip Opening Angle (CTOA) and maximum tangential stress (OMTS), were used for characterization. The variations of CTOA along with a propagating crack show a nonlinear decay followed by a stabilized regime, with the fraction of the stabilized regime increasing at lower strain amplitudes. The mixity of local KI and KII fields is directly related to OMTS, and this was assessed through measuring local deflections. Different growth modes of non-propagating cracks were identified through microstructural observations. Crystallographic analyses addressed the role of elasto-plastic incompatibility of neighboring grains. There exists a critical bound for Elastic Modulus (EM) and Schmid factor (SF) for the grains favoring subsurface crack propagation. The favorable twin-matrix incompatibility and the abundance of twins in (211) plane in the cracked region were also identified. Slip transfer analyses based on the Luster-Morris parameter revealed microstructurally controlled lower bounds that inhibit slip transfer, and dislocation debris analysis using TEM provided insights into the micromechanisms involved.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Nanoscience & Nanotechnology
Saeede Ghorbanpour, Jonathan Bicknell, Marko Knezevic
Summary: In this study, successful additive manufacturing of cobalt-based superalloy Mar-M-509 (R) via laser powder bed fusion was reported. The research examined the effects of build orientation and subsequent heat treatments on the microstructure evolution and monotonic strength and ductility of the alloy. Fatigue behavior, including low cycle fatigue (LCF) and high cycle fatigue (HCF), was investigated under different strain and stress amplitudes. The results showed anisotropic behavior in LCF, with higher amplitudes perpendicular to the build direction (BD), and longer fatigue life along the BD. In contrast, HCF behavior was found to be isotropic. The observed fatigue characteristics were correlated with the initial microstructure of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Satoshi Utada, Luciana Maria Bortoluci Ormastroni, Jeremy Rame, Patrick Villechaise, Jonathan Cormier
Summary: The VHCF properties of the Ni-based single crystal superalloy AM1 with pre-deformation at 1000°C were studied. Pre-deformation did not result in life reduction under fully reversed conditions (R = -1), but decreased VHCF lifetime under high mean stress conditions (R = 0.5) with a shift in crack initiation from internal to surface. The pre-deformed material exhibited coarsened microstructure bands on slip planes, leading to surface roughness and initiation of fatal cracks. Rejuvenation heat treatment post pre-deformation could restore microstructure and fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Chemistry, Physical
Zhengguang Li, Haiqin Qin, Kejun Xu, Zhenbo Xie, Pengcheng Ji, Mingming Jia
Summary: Strain-controlled low-cycle fatigue (LCF) tests and stress-controlled creep-fatigue interaction (CFI) tests were conducted on the FGH96 superalloy at 550°C to investigate its cyclic softening/hardening characteristics at different strain amplitudes and ratcheting strain characteristics under different hold time. The failure mechanism of the FGH96 superalloy under different loading conditions was analyzed through fracture observations. The results showed that the FGH96 superalloy exhibited different cyclic softening/hardening characteristics at different strain amplitudes, and the introduction of hold time exacerbated its ratcheting strain under asymmetric stress cycles. Fracture observations indicated that the strain amplitude, high-temperature oxidation, and the introduction of hold time affected the mechanical properties and fracture mode of the FGH96 superalloy.
Article
Materials Science, Multidisciplinary
Pengfei Wang, Xinbao Zhao, Quanzhao Yue, Wanshun Xia, Qingqing Ding, Hongbin Bei, Yuefeng Gu, Xiao Wei, Ze Zhang
Summary: In this study, the fatigue-damaged microstructures of Ni-based single-crystal superalloys were compared under cyclic deformation at 800 and 900 degrees C using electron microscopy. The relationship between microstructure and mechanical properties was investigated, and it was found that with increasing temperature, deformation was more concentrated in the y matrix channels and cyclic deformation behavior stabilized. Additionally, the importance of interfacial dislocation networks in enhancing cyclic stability and hindering cyclic tension-compression asymmetry was discussed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
R. Jiang, L. C. Zhang, W. T. Zhang, Y. Zhang, Y. Chen, J. T. Liu, Y. W. Zhang, Y. D. Song
Summary: The study reveals that the low cycle fatigue failure mode and stress relaxation behavior of FGH4098 change with increasing temperature and dwell time, mainly influenced by microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Xu Jia, Zi-wen Zhang, Chen Ling, Xu-ping Lu, Rong Jiang, Ying-Dong Song
Summary: This study conducted high-speed ballistic impact tests and fatigue tests on GH4169 alloy samples to investigate the effect of FOD depth on fatigue strength. It was found that as the FOD depth increases, the damage length, material losses, and stress concentration coefficient also increase, resulting in a reduction in fatigue strength. The study also showed that the Kitagawa-Takahashi diagram can be used as a basic model for the design of FOD tolerance.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Chemistry, Physical
Yuhei Ogawa, Masaki Hino, Masami Nakamura, Hisao Matsunaga
Summary: The study investigates the effect of hydrogen on the tensile properties of four hot-rolled plain-carbon steels with different carbon content. It was found that hydrogen significantly affects the tensile ductility of the materials, with pearlite grains on the surface serving as preferential origins of hydrogen-induced micro-cracks. Materials with a higher percentage of pearlite exhibit more considerable embrittlement due to the rapid coalescence of embryonic damage during tensile straining.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Mechanical
Yuhei Ogawa, Haruki Nishida, Masami Nakamura, Vigdis Olden, Alexey Vinogradov, Hisao Matsunaga
Summary: This study investigates the fatigue crack growth behavior of two carbon steels with different pearlite volume fractions in a pressurized gaseous hydrogen environment. The results show that pearlite can mitigate the accelerated crack growth caused by hydrogen. This is mainly attributed to the perpendicular alignment of ferrite/cementite lamellar in pearlite to the cracking direction, which acts as barriers to intermittently arrest crack propagation. However, the presence of pearlite lamellar parallel to the crack-plane leads to brittle delamination fracture, increasing the crack growth rate and compromising the mitigating effect of pearlite.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Mechanics
Saburo Okazaki, Satoshi Okuma, Kevinsanny, Yuhei Ogawa, Hideto Kawashima, Yusuke Funakoshi, Hisao Matsunaga
Summary: The study investigated the interaction-effects of adjacent, circumferential V-notches on the fatigue limit of Alloy 718, and found that specimens with seven adjacent circumferential notches had lower fatigue limit than those with a single circumferential notch. This was attributed to the increased stress intensity factor range of shear-mode fatigue cracks at notch-roots, resulting from the competition between stress mitigation through the mechanistic interaction of notches and the orderly spatial alignment of crack-planes.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Yuhei Ogawa, Keiichiro Iwata, Saburo Okazaki, Masami Nakamura, Kazuki Matsubara, Osamu Takakuwa, Hisao Matsunaga
Summary: Hydrogen affects crack-tip plastic-zone development by sharpening the crack tip shape, suppressing the extension of severely-deformed zone, and enhancing crack-tip branching, leading to a slower crack growth rate. However, it barely alters the overall plastic-zone size between in-air and hydrogen-gas conditions.
Article
Metallurgy & Metallurgical Engineering
Takashi Hosoda, Yuhei Ogawa, Osamu Takakuwa, Susumu Motomura, Hyuga Hosoi, Hisao Matsunaga
Summary: The addition of Ni was found to reduce hydrogen embrittlement sensitivity in high-Mn austenitic steels, while VC nano-particles could serve as trapping sites for dissolved hydrogen with only minor effects on hydrogen embrittlement resistance. Hydrogen enhanced intergranular fracture, with IG fracture being the primary reason for hydrogen-induced loss of ductility.
TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN
(2022)
Article
Materials Science, Multidisciplinary
Yuhei Ogawa, Kohei Noguchi, Osamu Takakuwa
Summary: This study investigated the tensile mechanical properties of a Ni-based superalloy 718 precharged with approximately 90 mass ppm hydrogen under a wide range of temperatures, aiming to clarify the uncertainties surrounding the hydrogen-related embrittlement mechanisms of the material. The study found that hydrogen had a substantial detrimental effect on the ductility of the material in the near-ambient to high-temperature range, resulting from microcrack initiations along annealing twin boundaries and crystallographic slip planes. Additionally, the study revealed that the dynamic hydrogen-dislocation interaction was not important for embrittlement. By combining the insights gained from the test program, a new model for the nucleation process of hydrogen-induced fracturing was established.
Article
Nanoscience & Nanotechnology
Haruki Nishida, Yuhei Ogawa, Kaneaki Tsuzaki
Summary: The mechanical performance of Fe-Cr-Ni alloys was studied after thermal hydrogen pre charging, and it was found that the concentrations of Cr and Ni significantly affected the hydrogen solubility and its impact on the alloy. Higher Cr content and Cr/Ni ratio led to increased hydrogen solubility and solid-solution hardening. Additionally, hydrogen facilitated deformation twinning in alloys with lower stacking fault energy. Increasing the twin density improved the alloy's ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Atsuki Setoyama, Yuhei Ogawa, Masami Nakamura, Yuya Tanaka, Tingshu Chen, Motomichi Koyama, Hisao Matsunaga
Summary: Increased strength levels result in accelerated fatigue crack growth caused by hydrogen. In the highest-strength material, the crack growth rate per cycle depends on the test frequency, proportional to load duration. The hydrogen-induced fatigue crack growth is due to stress-driven cracking along hierarchical martensite boundaries, caused by the degradation of interface strength as a result of competition between driving stress and resistance stress.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Naoaki Nagaishi, Yuhei Ogawa, Saburo Okazaki, Hisao Matsunaga
Summary: This study investigates the unique relationship between fatigue limit and stress concentration factor and stress ratio in austenitic stainless steel. Unexpectedly, the fatigue limit under negative stress ratio is superior to that under positive stress ratio, contrary to the behavior of smooth stainless steel. Switching from negative to positive stress ratio diminishes the effect of stress concentration factor on the deterioration of fatigue limit. Microhardness tests, microstructural observation, and finite element analysis reveal that these anomalies stem from the presence/absence of cyclic plasticity and martensitic transformation, dynamically strengthening the notch-root.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Multidisciplinary Sciences
Osamu Takakuwa, Yuhei Ogawa, Ryunosuke Miyata
Summary: The mechanical properties of structural alloys, such as the Ni-based superalloy 718, are degraded by the presence of hydrogen, leading to hydrogen embrittlement. In particular, the fatigue crack growth (FCG) property is significantly deteriorated by hydrogen, resulting in a higher growth rate and shorter lifetime for components operating in a hydrogenating environment. Therefore, understanding the mechanisms behind this acceleration phenomenon is crucial for developing alloys that are resistant to hydrogen occlusion. This study reveals that the FCG acceleration in Alloy718 can be negligible when hydrogen is dissolved, and instead, an abnormal deceleration of FCG can be achieved by optimizing the metallurgical state, offering a hopeful prospect for Ni-based alloys in hydrogenating environments.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Yuhei Ogawa, Haruki Nishida, Osamu Takakuwa, Kaneaki Tsuzaki
Summary: Direct evidence of solute hydrogen-assisted deformation twinning in Fe-24Cr-19Ni-based austenitic steel was obtained through an in-situ tensile test using a scanning electron microscope (SEM) equipped with electron backscattered diffraction (EBSD). Activation of twinning by hydrogen occurred earlier on both primary and secondary systems, leading to increased thickening of existing twins. These changes in twinning behavior were found to be associated with an accelerated work-hardening rate at later deformation stages, which is believed to be the underlying cause of the recently observed anomalous ductility improvement in steels with solute hydrogen.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Metallurgy & Metallurgical Engineering
Kohei Noguchi, Yuhei Ogawa, Osamu Takakuwa, Hisao Matsunaga
Summary: The study investigated the hydrogen embrittlement characteristics in nickel-based superalloy 718 through tensile tests under different hydrogen environments. It was observed that hydrogen-induced loss of ductility was maximized at 25 degrees C under internal hydrogen conditions, while the deleterious impact of hydrogen on ductility increased with temperature elevation under external hydrogen conditions. Scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) analyses revealed the micro structural initiation sites of hydrogen-induced micro-cracks at different temperatures in internal hydrogen states.
TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN
(2021)
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)
