Zobrazeno 1 - 10
of 200
pro vyhledávání: '"Mitsuru OHATA"'
Autor:
Akitada YASUTOMI, Mitsuru OHATA
Publikováno v:
Nihon Kikai Gakkai ronbunshu, Vol 90, Iss 938, Pp 24-00179-24-00179 (2024)
In this study, the threshold stress intensity factors for the hydrogen assisted crack initiation, KIH were compared using the high and low toughness welded joints simulated under two different PWHT conditions within the 2.25Cr-1Mo-V steel reactor fab
Externí odkaz:
https://doaj.org/article/8b559577c1534111a2c567e959e986a3
Autor:
Shin-ichi Inoue, Michiaki Yamasaki, Mitsuru Ohata, Shigeki Kakiuchi, Yoshihito Kawamura, Hidenori Terasaki
Publikováno v:
Journal of Advanced Joining Processes, Vol 9, Iss , Pp 100221- (2024)
Friction-stir (FS) welding was used for the first time to successfully join Mg–Zn–Y–Al–La alloy extrusions containing the long-period stacking ordered (LPSO) phase. Plastic flow produced fine α-Mg grains of sizes 2.0–2.5 μm with random or
Externí odkaz:
https://doaj.org/article/c33efeb544254cfcaa5b9357fbd0b2c8
Autor:
Tomokazu Sano, Tomoki Matsuda, Akio Hirose, Mitsuru Ohata, Tomoyuki Terai, Tomoyuki Kakeshita, Yuichi Inubushi, Takahiro Sato, Kohei Miyanishi, Makina Yabashi, Tadashi Togashi, Kensuke Tono, Osami Sakata, Yoshinori Tange, Kazuto Arakawa, Yusuke Ito, Takuo Okuchi, Tomoko Sato, Toshimori Sekine, Tsutomu Mashimo, Nobuhiko Nakanii, Yusuke Seto, Masaya Shigeta, Takahisa Shobu, Yuji Sano, Tomonao Hosokai, Takeshi Matsuoka, Toshinori Yabuuchi, Kazuo A. Tanaka, Norimasa Ozaki, Ryosuke Kodama
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-10 (2023)
Abstract Over the past century, understanding the nature of shock compression of condensed matter has been a major topic. About 20 years ago, a femtosecond laser emerged as a new shock-driver. Unlike conventional shock waves, a femtosecond laser-driv
Externí odkaz:
https://doaj.org/article/e7aa8878c021417eb97e0c7d3678896e
Publikováno v:
Materials & Design, Vol 235, Iss , Pp 112420- (2023)
We demonstrate multiscale mechanical testing using miniature and microscale tensile tests to elucidate the crack initiation and propagation behaviors corresponding to interfacial nanostructures in dissimilar joints of 6061 aluminum alloy and 304 stai
Externí odkaz:
https://doaj.org/article/2769077e79744416a626ee6ae3c157d5
Autor:
Mitsuru OHATA, Hiroto SHOJI, Kazuma SHIMIZU, Hiroyasu TANIGAWA, Taichiro KATO, Takashi NOZAWA
Publikováno v:
Nihon Kikai Gakkai ronbunshu, Vol 89, Iss 926, Pp 23-00168-23-00168 (2023)
This study aims to develop a numerical simulation-based method for predicting ductile crack growth resistance curve (R-curve) for pre-strained components for rational assessment of ductile crack growth controlling fracture for pre-strained structural
Externí odkaz:
https://doaj.org/article/919a9c34b0f841578d2915d71a75f1b8
Autor:
Takashi Yasutomi, Hiroyuki Kawata, Hiroshi Kaido, Eisaku Sakurada, Shigeru Yonemura, Hiroto Shoji, Mitsuru Ohata
Publikováno v:
Forces in Mechanics, Vol 9, Iss , Pp 100113- (2022)
The aim of this study is to elucidate the fracture mechanism of transformation-induced plasticity (TRIP) steel under reverse loading using a ductile damage simulation method. First, the fracture limit of a TRIP steel under the reverse path is experim
Externí odkaz:
https://doaj.org/article/7afc00933a4e4462a70e5c2cd4c801b7
Autor:
Tomoki Matsuda, Toshiya Ogaki, Kotaro Hayashi, Chihiro Iwamoto, Takashi Nozawa, Mitsuru Ohata, Akio Hirose
Publikováno v:
Materials & Design, Vol 213, Iss , Pp 110344- (2022)
The macroscale mechanical properties of dissimilar joints are generally influenced by the fracture behavior of joint interface. However, little is known about the dominant factor for the joint properties related with both macroscale fracture behavior
Externí odkaz:
https://doaj.org/article/1125d8a74b854a749cea9aed38ec2ec9
Autor:
Eri Ota, Tomoki Matsuda, Hiroto Shoji, Tomo Ogura, Fumikazu Miyasaka, Tomokazu Sano, Mitsuru Ohata, Akio Hirose
Publikováno v:
Materials & Design, Vol 212, Iss , Pp 110221- (2021)
In this study, the synergistic effects of a hybrid surface treatment involving hydrochloric acid (HCl) immersion and silanization on friction stir spot welding (FSSW) of aluminum and carbon fiber reinforced thermoplastic (CFRTP) were investigated. Ma
Externí odkaz:
https://doaj.org/article/23eb30d9f0024e088aa563cf05b0c137
Autor:
Tomoki Matsuda, Seigo Yamada, Akihisa Takeuchi, Kentaro Uesugi, Masahiro Yasutake, Tomokazu Sano, Mitsuru Ohata, Akio Hirose
Publikováno v:
Materials & Design, Vol 206, Iss , Pp 109818- (2021)
Herein, we investigated the fracture behavior of thermally aged Ag–Cu composite sinter joints through nano-X-ray computed tomography (nano-CT) combined with microscale tensile testing. Nano-CT results showed that the joint comprised Ag/oxidized Cu
Externí odkaz:
https://doaj.org/article/a4856461bd2c4c1e9ed6994e624f1203
Publikováno v:
Metals, Vol 12, Iss 5, p 776 (2022)
The evaluation of tube burring formability is a crucial task for finding a suitable material for tube-based automobile parts. The local strain at the ductile fracture site (fracture strain) should be evaluated for this purpose. Moreover, a cold-drawn
Externí odkaz:
https://doaj.org/article/0b082deca29e490c9a19b5b133c215f0