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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
Session ID: 334
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Shigeru Doi, Manabu Yasuoka, Shoji Harada, Shoichi Nishimura
Article type: Article
Session ID: 362
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Shijie ZHU, Yohei KANEKO, Takashi GOMYOU, Yasuo OCHI, Toshio OGASAWARA ...
Article type: Article
Session ID: 335
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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In order to investigate a fatigue properties of SiC/SiC composites, tensile tests and the low cycle fatigue tests of SiC/SiC composites were carried out at room temperature. Two types of SiC/SiC composites were manufactured for the tests. Tensile tests were conducted with a loading rate 0.02,1,10MPa/s to investigate the relationship between the ultimate strength and a loading rate. As a result of tensile tests, it was seen that ultimate strength decreased with a loading rate. Low cycle fatigue tests were conducted with a frequency 0.02Hz and R=-1 with strain-controlled and stress-controlled conditions. As a result of low cycle fatigue tests, it is seen that the SiC/SiC composites offered cyclic softening behavior and the relationship between the strain range and the fatigue live was evaluated as Manson-Coffin's relation.
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Souichiro NISHINO, Hideto SUZUKI, Kunio OHYA
Article type: Article
Session ID: 336
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Kenji Kanazawa, Takayuki Nishimura, Kazuhiko Matsuda, Koji Yamaguchi
Article type: Article
Session ID: 337
Published: July 19, 2001
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Shin-ichi NISHIDA, Nobusuke HATTORI, Satoshi UEMURA
Article type: Article
Session ID: 338
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Nobusuke HATTORI, Shin-ichi NISHIDA, Shinji DATE
Article type: Article
Session ID: 339
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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In order to clarify the influence factors on high-cycle fatigue of high strength steel SUJ2, the fatigue test have been carried out up to 10^8 cycles under rotating bending at room temperature. According to the experimental results, in the case of comparative low-cycle range, the fatigue crack initiates from specimens surface. On the other hand, in the case of high-cycle range, the crack initiates from an internal inclusion. In addition, there exisits transitional zone in the S-N curves between surface failure and fish-eye one. The damage, which means slipping would be accumulated in the specimen's surface under the high stress amplitude during two step stress fatigue. In addition, according to the above phenomena, surface appears in the region of extra-high cycle fatigue. According to the observation results, slip bands are generated in the spoecimen's surface. That is to say, speaking of failure form cause of surface hardness and surface damage.
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Akio YONEZU, Takeshi OGAWA, Tsuyoshi KIMOTO
Article type: Article
Session ID: 340
Published: July 19, 2001
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Kunio ASAI, Shigeo SAKURAI, Kenichiro NOMURA
Article type: Article
Session ID: 341
Published: July 19, 2001
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Motohiro TAKAI
Article type: Article
Session ID: 342
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
Session ID: 343
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Naomi Hamada, Masao Sakane
Article type: Article
Session ID: 344
Published: July 19, 2001
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Koji YAMAGUCHI, Kazuo KOBAYASHI, Megumi KIMURA
Article type: Article
Session ID: 345
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Yoshio FUKUDA, Masakazu KANOU, Satoshi SUKEGAWA, Kazuya WATANABE, Ryuk ...
Article type: Article
Session ID: 346
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Hirotsugu INOUE, Eiji KUSABIRAKI, Kikuo KISHIMOTO, Toshikazu SHIBUYA
Article type: Article
Session ID: 347
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Hirotsugu INOUE, Takuro ASAOKA, Kikuo KISHIMOTO, Toshikazu SHIBUYA
Article type: Article
Session ID: 348
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Roziq Himawan, Yoshio ARAI, Eiichiro TSUCHIDA
Article type: Article
Session ID: 349
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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This present study was done with the aim of improving the reliability of quantitative ultrasonic nondestructive testing. The water immersion ultrasonic method, using an oblique longitudinal wave with large incidence angle (over the critical angle), was applied to measure small surface fatigue crack due to low-cycle loading. Surface fatigue crack initiation process, beginning from persistent slip band initiation, was measured using ultrasonic microscope. To estimate the precision of measurement, four transducers with different frequency, they are 5,10,20 and 50MHz, respectively, were used to make clear the relation between the ultrasonic frequency and its minimum detectable size of surface fatigue crack.
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Hirotsugu OGI, Shinji AOKI, Masahiko HIRAO
Article type: Article
Session ID: 350
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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A nonlinear acoustic measurement is studied for fatigue-damage monitoring. An electromagnetic acoustic transducer (EMAT) magnetostrictively couples to a surface-shear wave resonance along the circumference of a rod specimen during rotating bending fatigue of carbon steels. Excitation of the EMAT at the half of the resonance frequency caused the standing wave containing only the second-harmonic component, which was received by the same EMAT to determine the second-harmonic amplitude. Thus measured surface-wave nonlinearity always showed two distinct peaks at 60 % and 85 % of the total life. We attribute the earlier peak to the crack nucleation and growth, and the later peak to an increase of free dislocations associated with crack extension in the final stage.
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Hiroyuki Fukutomi, Takashi Ogata, Akito Nitta
Article type: Article
Session ID: 351
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Analytical approaches to the modeling of elastic wave propagation in solids are difficult to apply in the ultrasonic nondestructive testing (NDT) systems, where one is interested in predicting realistic transducer signals from ultrasound interactions with complex defect shapes. This report presents a finite element formulation for an overall ultrasonic NDT. Viscous boundaries are introduced to limit the problem domain to part of a tested material. These make it possible to reduce computational costs.
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Riichi Murayama, Souji Harada, Norisato Shigenaga, Syouichi Miyano
Article type: Article
Session ID: 352
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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The electromagnetic acoustic transducer(EMAT) for Lamb wave, which consists of a meander coil with a distance of 2.5mm between two channels and has a symmetrical structure in the vertical direction for both surface sides of a thin steel sheet, has been researched as a flaw detector of thin steel sheets. This EMAT can generate some Lamb waves with variable wavelengths and multiple modes, and can separately generate symmetrical or anti-symmetrical mode Lamb waves.
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Shiro BIWA
Article type: Article
Session ID: 353
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Hitoshi YOSHIKAWA, Naoshi NISHIMURA, Shoichi KOBAYASHI
Article type: Article
Session ID: 354
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Masahiro ARAI, Naohiro SUMITA
Article type: Article
Session ID: 355
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Shoji NAKAJIMA, Shiro BIWA, Nobutada OHNO
Article type: Article
Session ID: 356
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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[in Japanese]
Article type: Article
Session ID: 357
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Kohhei TANAKA, Hiroshi AOYAMA, Nobuo TAKEDA
Article type: Article
Session ID: 358
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Masumi HASEGAWA, Yasutoshi SASAKI
Article type: Article
Session ID: 359
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Changes in shear wave velocity were measured by the sing-around method rotating the oscillation direction of the wave with respect to the orthotropic axis of wood. The velocity of the shear wave propagated through the stressed wood decreased suddenly when the oscillation direction coincided with the tangential direction of the wood. The polarization direction of shear wave coincided with the principal axes of wood, not with the direction of the principal stresses. This finding indicated that the polarization direction was much affected by the texture-induced anisotropy of wood. Based on the result, the bending and shear stress distributions in wood beam specimen were estimated by the acoustoelastic birefringent method. The stress values estimated agreed well with those obtained by the strain-gauge method and mechanical calculations.
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[in Japanese], [in Japanese]
Article type: Article
Session ID: 360
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Munehiro KAWAMURA, Yukio SANOMURA, Satoshi IKEDA
Article type: Article
Session ID: 361
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Article type: Appendix
Pages
App7-
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Atumi OHTSUKI, Michimoto NISHIMURA
Article type: Article
Session ID: 401
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Mitsuo NOTOMI, Haruo SHIMOSAKA, Hirokazu SHIMODA, Shigenobu SUZUKI, To ...
Article type: Article
Session ID: 402
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Natsumi ITOH, Mitsuo NOHTOMI, Kenichirou OHMATA, Takashi ABE
Article type: Article
Session ID: 403
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Nagatoshi OKABE, Tadashi IURA, Xia Zhu, Mitsuyoshi TSUTSUMI, Kazuki MO ...
Article type: Article
Session ID: 404
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Tadashi IURA, Nagatoshi OKABE, Mitsuyoshi TSUTSUMI, Kazuki MORI
Article type: Article
Session ID: 405
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Nagatoshi OKABE, Tadashi IURA, Xia Zhu, Masashi TANIGUCHI
Article type: Article
Session ID: 406
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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It was found out that a local collar could be formed on a rod by a combination of compression, bending and axial-rotation temperature rise in collar forming process was below 15℃ in spite of super plastic deformation. This collar forming method is a technology that Baushinger effect can be applied to form collars by giving altemate bending stress of tension and compression to a rod subjected to axial stress slightly below yield strength.
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H. TOBUSHI, K. OKUMURA, M. ENDO, T. IKAWA, K. TANAKA
Article type: Article
Session ID: 407
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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H. TOBUSHI, S. HAYASHI, K. OKUMURA, M. ENDO
Article type: Article
Session ID: 408
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Hajime KAYANO, Mitsuo NOUTOMI, Hisao HASEGAWA, Haruo SHIMOSAKA, Noburo ...
Article type: Article
Session ID: 409
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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T. Sakuma, N. Okabe, M. Hosogi, S. Miyazaki, K. Okita
Article type: Article
Session ID: 410
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Maho Hosogi, Nagatoshi Okabe, Toshio Sakuma, Shuichi Miyazaki, Keisuke ...
Article type: Article
Session ID: 411
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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N. Okabe, T. Sakuma, M. Hosogi, S. Miyazaki, K. Okita
Article type: Article
Session ID: 412
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Yutaka SUDOH, Mitsuo NOTOMI, Hisao HASEGAWA, Haruo SIMOSAKA, Noburo EH ...
Article type: Article
Session ID: 413
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Katsuhiko SASAKI, Hiromasa ISHIKAWA, Akiyuki YANAGIMOTO
Article type: Article
Session ID: 414
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Tomofumi ISHIKAWA, Mineo KOBAYASHI, Nobutada OHNO, Hiroyuki TAKAHASHI, ...
Article type: Article
Session ID: 415
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Noriyuki TSUCHIDA, Kotobu NAGAI, Yo TOMOTA
Article type: Article
Session ID: 416
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Akira KURAKAKE, Masataka TOKUDA, Tadashi INABA, Hiroyuki OHIGASHI, Yan ...
Article type: Article
Session ID: 417
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Kenji Uchio, Nabil Zakhary, Katsuaki Nakamura, Michihiko Nakagaki
Article type: Article
Session ID: 418
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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Meso-mechanical material modeling of super plastic metal alloy is attempted. Multi-crystal grains in the metal that exibit extensive surface sliding is modeled by setting a tangential spring layer between the grain and the matrix. The constitutive law for the domain in which mult-phase crystal grains of the type are dispersed is derived with the use of equivalent inclusion method on the basis of self-consistent shceme.
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T. OHASHI, K. ASAKAWA
Article type: Article
Session ID: 419
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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We numerically analyze slip deformation in models of dual phase materials that contains a plastically-deformable or plastically-non-deformable inclusion, and compare dislocation structures in the vicinity of each inclusions. The results show that the hardness of inclusion does not have large effect on the structure of dislocations outside the inclusion. On the other hand, distribution of normal stress in inclusion show large difference between the plastically-deformable inclusion model and the plastically-non-deformable inclusion model. We discuss the relationship between development of slip deformation and stress, distribution in inclusion.
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
Session ID: 421
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
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