Article
Nanoscience & Nanotechnology
Kejin Zhang, Shigeru Hamada, Tatsuo Yokoi, Hiroshi Noguchi
Summary: To investigate the characteristics of precipitation-hardened steel, fatigue tests were conducted with artificial micro defects that imitate the flaws caused by the punching process. The authors found that material properties and flaws have an impact on the fatigue strength properties, specifically in terms of fatigue crack propagation. The damage accumulation mode changes the fatigue limit's physical meaning from non-propagation to initiation. Processing conditions to improve fatigue strength characteristics were also proposed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Jun Guo, Aimin Zhao, Maosheng Yang
Summary: The fatigue properties of M50 bearing steel under high cycle fatigue at room temperature were investigated. The fatigue cracks in M50 bearing steel primarily originated from MgO-Al2O3 inclusions and MC/M2C primary carbides. The voids were initiated by debonding of inclusions from the matrix and cracking of primary carbides under cyclic loading. Small cracks initiated perpendicular to the tensile stress and propagated at a speed of 8.81 x 10-10 m/cycle in the fine granular area (FGA). A fatigue crack nucleation model and fatigue life model were established based on stress intensity factor range, defect properties, and number of cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Sergi Parareda, Daniel Casellas, Antoni Lara, Antonio Mateo
Summary: The work presents a new methodology for determining fatigue strength quickly and reliably by monitoring specimen stiffness changes. The proposed method offers a more efficient and evident experimental procedure compared to traditional methods.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Thanh Tuan Nguyen, Kee Bong Yoon, Jaeyeong Park, Un Bong Baek
Summary: The low-cycle fatigue behavior of P91 steel was investigated under various strain amplitudes at different temperatures. It was found that the fatigue life decreased with increasing temperature and strain amplitude, leading to degradation of fatigue limits and increased cyclic softening. Models were established to express the relationship between strain amplitude-fatigue life curves and cyclic stress-strain. The transition fatigue life also increased at elevated temperatures due to multiple oxidation-enhanced crack initiations after long-term exposure.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Chemistry, Physical
Viorel Goanta, Corneliu Munteanu, Sinan Muftu, Bogdan Istrate, Patricia Schwartz, Samuel Boese, Gehn Ferguson, Ciprian Ionut Moraras
Summary: This paper studies the fatigue characteristics of cold-sprayed Ni/CrC coatings on 52100 steel. The results show that the coating material has good fatigue behavior, especially at low stresses and a high number of cycles. It is also found that cracks initiate on the surface of the base material and propagate into the coating material.
Article
Engineering, Mechanical
Ruiming Zhang, Kai Ma, Wenzhu Peng, Jinyang Zheng
Summary: The fatigue crack growth rates of 4130X steel in different hydrogen concentrations were measured, and the influence of hydrogen on crack behavior was analyzed. Results show that the crack growth rate increases with increasing hydrogen pressure, reaching a threshold at 87.5 MPa.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Materials Science, Multidisciplinary
Sergi Parareda, Daniel Casellas, Marc Mares, Antonio Mateo
Summary: This article presents a new fatigue testing method based on fatigue damage monitoring, which allows determining the fatigue resistance of metallic materials in a short time and with few specimens. The method, named as the stiffness method, monitors the inelastic strains as an indicator of fatigue damage evolution. Digital image correlation techniques are used for strain measurements, which provide more convincing and evident results than other monitoring techniques.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Juan Shang, Zhengli Hua, Baihui Xing, Haotian Wei, Jinyang Zheng
Summary: This study investigates hydrogen embrittlement in mixtures of hydrogen and inert gas at different gas pressures. Fatigue crack growth rate (FCGR) tests and hydrogen permeation and desorption experiments were conducted to understand the acceleration of FCGR in the mixtures. The results suggest that the fast hydrogen entry rate in the mixtures leads to a higher local hydrogen concentration near the crack tip, causing the observed acceleration.
Article
Engineering, Mechanical
Ali Abboud, Ali AlHassan, Benjamin Doenges, Jean Sebastian Micha, Robert Hartmann, Luthar Strueder, Hans-Juergen Christ, Ullrich Pietsch
Summary: The microstructure of austenitic-ferritic duplex stainless steel loaded in the Very High Cycle Fatigue regime was investigated using microbeam energy-dispersive X-ray Laue diffraction. It was found that fatigue cracks initiated at grain boundaries assisted by slip bands in austenite grains, leading to changes in microstructure. The study also revealed the presence of lattice curvature, strain gradient, and fine granular areas separated by polarized dislocation walls in the ferrite phase near the crack.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Zhang Ruijie, Zheng Chunlei, Lv Bo, Zhang Peijun, Gao Guhui, Yang Yongqiang, Zhang Fucheng
Summary: This study investigates the influence of nonuniform microstructure on the rolling contact fatigue performance in bainitic rail steel. Increasing the degree of segregation improves the wear resistance but reduces the rolling contact fatigue performance. Cracks propagate along segregation bands, leading to failure. The non-uniform strain distribution due to different hardness values between the matrix and segregation region is the main cause of fatigue crack initiation. Plastic deformation on the surface of the specimen produces dislocations and nanocrystals.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Metallurgy & Metallurgical Engineering
Yusui Uchida, Motomichi Koyama, Yoshihiro Fukushima, Kaneaki Tsuzaki
Summary: The influence of Mn addition on fatigue properties of ferritic steel containing solute carbon was examined. It was found that the addition of Mn can increase the hardness and fatigue limit of the steel, and suppress intergranular cracking at low stress amplitudes.
ISIJ INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Naoki Yamaguchi, Yuichi Tokita, Tsuyoshi Shiozaki, Yoshikiyo Tamai, Yuji Ichikawa, Kazuhiro Ogawa
Summary: This study investigated the fatigue crack growth and non-propagating behavior in bent sheets of ultra-high strength steel (UHSS) using artificial cracks introduced by a picosecond pulse laser. It was found that the internal compressive residual stress introduced by bending can arrest crack propagation, and the absence of this compressive residual stress shortens the crack propagation life. This research provides important insights into the fatigue behavior of cracks on UHSS sheets.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
Xiaolu Gui, Guhui Gao, Baifeng An, R. D. K. Misra, Bingzhe Bai
Summary: The study investigated the effects of inclusion size and microstructural features on HCF/VHCF in a B/M steel. It was found that fatigue crack initiation was mainly influenced by inclusions, with the majority of fatigue life consumed by the crack initiation process regardless of the source of the crack. The ratio of fatigue crack initiation life to total fatigue life exhibited a wide scatter due to variations in the B/M hierarchical structure within individual prior austenite grains when cracks initiated from sub-surface microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
D. Harandizadeh Najafabadi, A. Barabi, D. Thibault, M. Brochu
Summary: In this study, the influence of hydrogen on the fatigue crack propagation rate in tempered martensitic stainless steel was investigated. An original model was proposed and validated through experiments. The results showed that there is a critical stress intensity factor range at which the impact of hydrogen on the fatigue crack propagation rate is maximum.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Hironobu Arashima, Yusuke Yanagisawa, Ryo Ikeda, Shigehito Isobe, Naoyuki Hashimoto
Summary: Four heats of commercially available JIS SNCM439 steel were tested in air and hydrogen gas to investigate their fatigue behavior. It was found that large nonmetallic inclusions decreased the fatigue limit and significantly reduced the fatigue life in hydrogen, even at low stress amplitudes near the fatigue limit.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Mechanical
Junji Sakamoto, Shigeru Hamada, Hiroshi Noguchi
ENGINEERING FAILURE ANALYSIS
(2018)
Article
Mechanics
Shigeru Hamada, Tsuyoshi Moriyama, Hiroshi Noguchi
ENGINEERING FRACTURE MECHANICS
(2018)
Article
Chemistry, Physical
Motomichi Koyama, Kishan Habib, Takuro Masumura, Toshihiro Tsuchiyama, Hiroshi Noguchi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Nanoscience & Nanotechnology
Thanh Thuong Huynh, Motomichi Koyama, Yoshimasa Takahashi, Shigeru Hamada, Kaneaki Tsuzaki, Hiroshi Noguchi
SCRIPTA MATERIALIA
(2020)
Article
Engineering, Mechanical
Kai Suzuki, Motomochi Koyama, Shigeru Hamada, Kaneaki Tsuzaki, Hiroshi Noguchi
INTERNATIONAL JOURNAL OF FATIGUE
(2020)
Article
Engineering, Mechanical
Zhao Zhang, Motomichi Koyama, Kaneaki Tsuzaki, Hiroshi Noguchi
Summary: Low-cycle fatigue resistance of laminated TRIP-maraging steels is excellent due to roughness-induced crack closure (RICC). The increase in annealing time at 873 K enhances retained austenite fraction and reduces hardness, with no difference in fracture surface roughness between 1 h-steel and 8 h-steel. Different fatigue sub-cracks and surface roughness were observed in 8 h-steel compared to 1 h-steel due to hardness-dependent wear resistance.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Virendra Kumar Verma, C. K. Gopalakrishnan, Shigeru Hamada, Tatsuo Yokoi, Hiroshi Noguchi
Summary: This study compares the fatigue properties of two precipitation-hardened steels, finding that one steel is more susceptible to strain localization, which affects fatigue crack propagation. The superiority of fatigue limit for precipitation-hardened steel depends on the initial crack size, while strain localization influences its notch sensitivity.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Wanjia Li, Shigeru Hamada, Hiroshi Noguchi
Summary: The appearance of strain localization in front of the crack tip is crucial for promoting the transition towards fatigue crack extension. The study on TWIP steel revealed significant interaction between strain concentration and strain localization for long cracks.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Mechanical
Kai Suzuki, Shigeru Hamada, Motomichi Koyama, Kaneaki Tsuzaki, Hiroshi Noguchi
Summary: Fatigue tests and analysis on a high-entropy alloy revealed a transition in fatigue crack extension mode based on the severity of strain concentration.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Wanjia Li, Shigeru Hamada, Hiroshi Noguchi
Summary: In this study, a Cu-based single crystal was examined using the crystal-plasticity finite element method (CPFEM) model. A new material index for strain localization susceptibility (SLS) was introduced, which could reflect the SLS of the material. Additionally, a critical material index value based on strain localization was determined for predicting the crack behavior.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Kejin Zhang, Shigeru Hamada, Kotaro Shindome, Tatsuo Yokoi, Hiroshi Noguchi
Summary: In this study, tensile tests were conducted to determine the strength of partially worked metals, revealing the behavior change caused by shear cracks during tensile loading. The presence of microscopis brittle fractures causing shear cracks was also observed in specimens exhibiting macroscopic brittle fracture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Kejin Zhang, Shigeru Hamada, Tatsuo Yokoi, Hiroshi Noguchi
Summary: To investigate the characteristics of precipitation-hardened steel, fatigue tests were conducted with artificial micro defects that imitate the flaws caused by the punching process. The authors found that material properties and flaws have an impact on the fatigue strength properties, specifically in terms of fatigue crack propagation. The damage accumulation mode changes the fatigue limit's physical meaning from non-propagation to initiation. Processing conditions to improve fatigue strength characteristics were also proposed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Bowen Chen, Shigeru Hamada, Wanjia Li, Hiroshi Noguchi
Summary: A study on the influence of material and mechanical effects on the damage accumulation mode of fatigue crack propagation was conducted in a polycrystalline copper specimen using a crystal plasticity finite element method. The plastic normal strain localization ahead of the notch root, which is correlated with damage accumulation-fatigue crack propagation, was analyzed. Consequently, an equation for the critical grain size was formulated using the Schmid factor, misorientation angle, and plastic zone size to characterize the critical occurrence condition for damage accumulation-fatigue crack propagation. Additionally, a method for predicting the size of the damage accumulation-fatigue crack propagation region was proposed.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Taeseul Park, Asuka Kitahara, Toshiyuki Ishina, Shigeru Hamada, Hiroshi Noguchi
Summary: In this study, the current status of linear and nonlinear fracture mechanics was examined, and the requirements for elastic-plastic fracture mechanics (EPFM) as the next step in fracture mechanics were identified. The study proposed the use of imaginary crack tip opening displacement (I-CTOD) as a driving force for EPFM and conducted elastic-plastic finite element analyses of cracked solids in different work-hardened materials to understand the characteristics of the singular fields of elastic and plastic strains near a crack tip. It was found that I-CTOD represents the intensity of the singular fields of plastic strain, elastic strain, and imaginary plastic deformation near the crack tip in both plane stress and plane strain states. Therefore, I-CTOD shows promise as a mechanical driving force parameter for EPFM.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
Virendra Kumar Verma, He Liu, Shigeru Hamada, Hiroshi Noguchi
Summary: This study investigates the fatigue crack propagation of two different precipitation hardened steels, finding that despite having the same tensile strength and hardness values, they exhibit different fatigue properties. Particularly, there is a vice-versa nature observed for the initially small and large crack growth stages.
MATERIALS TODAY-PROCEEDINGS
(2021)
