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Masayuki YOSHIBA, Ohmi MIYAKAWA, Kenkichi SATO, Hiroshi FUJISHIRO
1984 Volume 50 Issue 454 Pages
1113-1122
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Sotomi ISHIHARA, Kazuaki SHIOZAWA, Kazyu MIYANO
1984 Volume 50 Issue 454 Pages
1123-1132
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Sotomi ISHIHARA, Kazuaki SHIOZAWA, Kazyu MIYANO
1984 Volume 50 Issue 454 Pages
1133-1142
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Kenjiro KIMAI, Hiroshi KANASAKI
1984 Volume 50 Issue 454 Pages
1143-1150
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Keiro TOKAJI, Zenji ANDO, Takahiro KOJIMA
1984 Volume 50 Issue 454 Pages
1151-1157
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Haruo NAKAMURA, Hideo KOBAYASHI, Satoru YANASE, Hajime NAKAZAWA
1984 Volume 50 Issue 454 Pages
1158-1165
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Tsuneshichi TANAKA, Tatsuo SAKAI, Kenji OKADA
1984 Volume 50 Issue 454 Pages
1166-1173
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Hiroyuki MATSUMOTO, Takashi HIRATA, Hideaki KASANO, Ichiro NAKAHARA
1984 Volume 50 Issue 454 Pages
1174-1182
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Kazuo TAKAKUDA, Takashi KOIZUMI, Toshikazu SHIBUYA
1984 Volume 50 Issue 454 Pages
1183-1192
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Kazuo TAKAKUDA
1984 Volume 50 Issue 454 Pages
1193-1200
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Sigeru AOKI, Kikuo KISHIMOTO, Akihiko TAKETANI, Masaru SAKATA
1984 Volume 50 Issue 454 Pages
1201-1209
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Akihiro MISAWA, Masahisa TAKASHI, Takeshi MISAWA
1984 Volume 50 Issue 454 Pages
1210-1217
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Kiyotsugu OHJI, Shiro KUBO, Noboru YAMAKAWA, Toshihumi KURI
1984 Volume 50 Issue 454 Pages
1218-1227
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Yukio SUGAWARA, Hiromasa ISHIKAWA, Kin-ichi HATA
1984 Volume 50 Issue 454 Pages
1228-1235
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Takeji ABE, Shigeru NAGAKI, Tetsuya AKASE
1984 Volume 50 Issue 454 Pages
1236-1244
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Yuji SUGITA
1984 Volume 50 Issue 454 Pages
1245-1252
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Fusahiro YOSHIDA, Yoichi OBATAYA, Syuji YAMAMOTO, Masanobu OHMORI
1984 Volume 50 Issue 454 Pages
1253-1259
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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The effects of variations in the maximum effective stress and stress ratio on biaxial strain accumulating behaviors are experimentally investigated using thin-walled tubular specimens of a carbon steel subjected to combined steady cyclic axial load and internal pressure. When the maximum effective stress was changed with number of cycles keeping constant in the stress ratio, the strain accumulating rate under biaxial stress condition was equal to the rate under uniaxial stressing. The biaxial strain accumulating rate was smaller compared with the rate in the uniaxial condition when the stress ratio was changed with number of cycles. A constitutive equation of biaxial mechanical ratcheting is proposed. The predictions by the present equation are agreed well with the experimental observations.
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Kazuro KAGEYAMA, Katsunobu NONAKA, Shoji SHIMAMURA, Shunji FUKUDA
1984 Volume 50 Issue 454 Pages
1260-1266
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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Fracture toughness of carbon-cloth/epoxy composites is analytically and experimentally discussed. Specimens with different angle of fiber direction are used in order to examine the anisotropy of the facture toughness K
C. The stress intensity factors of the anisotropic specimens are calculated by using the finite element method with a crack tip singular element. The effect of the specimen type, thickness, crack length and crack tip width on the fracture toughness is examines. The acoustic emisson (AE) is measured during the fracture toughness testing. The amplitude distribution and the relation between AE event count and the applied stress intensity factor are also examined.
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Sumio YOSHIOKA, Katsuhiko WATANABE, Hideo KITAGAWA, Akio INOUE, Michio ...
1984 Volume 50 Issue 454 Pages
1267-1274
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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The fatigue crack growth threshold (ΔK
th) of steel materials was experimentally studied under mode III or mixed mode I+III, and a necessary criterion for estimating the fatigue strength of cracked components under mixed mode condition including mode III loading was studied. The value of ΔK
th under mode III is known to be constant irrespective of the effect of stress ratio (R=K
min/K
max). At the same time, the value of ΔK
th under mixed mode I+III is found to be evaluated by the fracture criterion based on the maximum principal stress criterion. It has been further confirmed that the fatigue strength under mode III of a welded joint possessing an unpenetrated portion may be estimated by using the technique of fracture mechanics.
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Toyomitsu SENDA
1984 Volume 50 Issue 454 Pages
1275-1281
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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The fractographic features of the fracture surfaces caused by impact loads and the correlation between the features and the underlying microstructures are studied. The specimens of structual steel SS41 are broken off by a gun-type impact testing machine or Charpy impact testing machine at various impact velocities. The fracture surfaces are observed and photographed using a scanning electron microscopy (SEM) and then plated electrolytically with nickel. The specimens are cut on a plain perpendicular to the fracture surface. The cross sections are polished and etched. The optical photomicrograph of the section reveals the profile of the surface and the underlying microstructure without any edge rounding. Matching the SEM photographs to the optical micrographs, the correlation between the fractographic features and the microstructures is discussed.
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Iwao HAYASHI, Teru HAYASHI
1984 Volume 50 Issue 454 Pages
1282-1290
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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The formulae for the torsional stiffness and those for the yield torque of small involute-splined shaft couplings are derived under some assumptions. then the four kinds of small splined shaft couplings are made as a trial, and those torsional characteristics are measured and compared with the theoretical ones. Consequently it is found that the assumptions are right, and the formulae are practically enough to calculate the torsional characteristics. Moreover the relation between the torsional characteristics and some parameters of the splined shaft couplings are studied with the formulae. And some instructions for minimizing the size of the couplings are obtained.
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Katsuhiko WATANABE, Yutaka KURASIGE
1984 Volume 50 Issue 454 Pages
1291-1302
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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The crack energy density ε
J-integral which is the path independent expression of εare applied to creep problem and it is shown that εand its differential coefficient with respect to time ε
st are valid parameters to creep crack without any restriction on constitutive equation. The contents are as follows; (1) εand ε
st are introduced as creep crack parameters and it is shown that ε
st can be evaluated by path independent integral ε
Jst obtained by differentiating ε
J with respect to time. (2) It is pointed out that J'-integral (C
*-parameter) can be evaluated by newly-introduced ε'
Jst which is a path independent integral even to non-steady state creep, and the physical meaning of J' is clarified based on ε'
Jst. Also the relation between ε
st and J' is discussed ant the role of J' is made clear. (3) The validities of εand ε
st as creep crack parameters are numerically verified through finite element analyses.
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Hitonobu NISHITANI, Masahiro ENDO
1984 Volume 50 Issue 454 Pages
1303-1308
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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The successive observations of the rotating bending fatigue processes were made on the age-hardened aluminum alloy having extremely small notches whose depth t and root radius ρ were smaller than the grain size. The age-hardened aluminum alloy is notch sensitive for the ordinary notch whose ρ is much larger than the grain size. However, it is notch insensitive for the case of an extremely small notch. This phenomenon is explained based on the behavior of shear mode micro-cracks initiated from the specimen surface.
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Hiroshi ISHIKAWA, Akita TSURUI
1984 Volume 50 Issue 454 Pages
1309-1315
Published: June 25, 1984
Released on J-STAGE: February 21, 2008
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A stochastic fatigue crack growth model has been proposed in consideration of spatial random propagation resistance. The Fokker-planck equation has first been formed and solved analytically for a locally stationary random process. Then, by use of the solution, a stochastic growth model has been constructed which is deemed to reflect the engineering reality of random propagation resistance due to material inhomogeneity. Based upon the mode., the theoretical fatigue crack propagation life distribution has been derived explicitly, and its characteristics have been examined carefully. At the same time, it is exemplified that the derived life distribution shows a very good agreement with experimental data, and this suggests a wide applicability of the proposed model in the practical design.
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