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Hiromasa ISHIKAWA
1985 Volume 51 Issue 472 Pages
2677-2683
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Akira FUKUSHIMA, Hiroshi MISAWA, Shotaro KODAMA
1985 Volume 51 Issue 472 Pages
2684-2691
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Hiromitu WATANABE, Haruo YAMAMOTO, Yuichi KAWADA
1985 Volume 51 Issue 472 Pages
2692-2698
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Toshimi KONDO, Hideki SEKINE, Osamu TAMATE
1985 Volume 51 Issue 472 Pages
2699-2707
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Hideaki KASANO, Osamu YAMASHITA, Hiroyuki MATSUMOTO, Ichiro NAKAHARA
1985 Volume 51 Issue 472 Pages
2708-2714
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Akihide WASHIDA, Eiichiro TSUCHIDA, Hideo KOBAYASHI
1985 Volume 51 Issue 472 Pages
2715-2720
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Yukitaka MURAKAMI, Chobin MAKABE, Hironobu NISITANI
1985 Volume 51 Issue 472 Pages
2721-2729
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Kouitirou ISHIHARA, Genki YAGAWA, Isami HASEGAWA
1985 Volume 51 Issue 472 Pages
2730-2737
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Yuji SOGABE, Masayuki TSUZUKI
1985 Volume 51 Issue 472 Pages
2738-2746
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Yasuhiro KANTO, Genki YAGAWA
1985 Volume 51 Issue 472 Pages
2747-2756
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Kazuhiko SAKAGUCHI, Iwao NAGANO
1985 Volume 51 Issue 472 Pages
2757-2764
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Akira SHIMAMOTO
1985 Volume 51 Issue 472 Pages
2765-2770
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Takeshi OGAWA, Hideo KOBAYASHI, Keiro TOKAJI
1985 Volume 51 Issue 472 Pages
2771-2776
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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The effects of ΔK-gradient and cyclic loading below ΔK
th on characteristics in fatigue crack growth were investigated under ΔK-increasing tests. In this study, specimens were annealed in vacuum after precracking, thus the precrack could be regarded as an ideal crack. The results show that the ΔK-gradient, namely C=1/ΔK·dΔK/da, is a controlling factor to fatigue crack growth. When C is sufficiently large, the crack growth rates are accerelated, because the contribution of the fretting oxide induced crack closure are reduced. Cyclic loading below ΔK
th influences on the following crack growth characteristics for the case of low stress ratio, R=0.05. However, the effect disappears for R=0.85 Therefore, ΔK-increasing tests should be carried out under high stress ratio and C value. In this test method, non-oxide controlled crack growth characteristics can be obtaind much more rapidly than in the conventional ΔK-decreasing test under R-constant condition.
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Takuo HAYASHI, Ryosuke UGO
1985 Volume 51 Issue 472 Pages
2777-2782
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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In the present paper, the effects of fillers on the characteristics of dispersion strengthened composite materials (DSCM) are considered theoretically assuming that the filler particles are elliptic. The theoretical results show that the Young's modulus of DSCM is dependent on the shape and orientation of the particles as well as the volume loading. In order to prove the results, numerical calculations are performed by F. E. M. for some DSCM models, in which the position of particles is determined with random number table so that the particles are randomly distributed. The shape of the particles is assumed to be square and rectangular. Evperimental studies are also performed on the DSCM specimens made of epoxy and steel particles, and their Young's moduli are mesured. They show good agreement between experimental and numercal results.
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Manabu TANAKA, Hiroshi IIZUKA
1985 Volume 51 Issue 472 Pages
2783-2788
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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A continuum mechanics model, which incorporated the effect of dynamic recovery, was developed to explain the deformation behavior of metallic materials with ellipsoidal second-phase particles at elevated temperatures. A theoretical discussion based on this model was made on the effects of the shape, particle size, orientation and elastic modulus of the second-phase particles on the high-temperature deformation of the materials. It was assumed in this study that the dynamic recovery process was controlled by volume diffusion or grain-boundary diffusion of atoms. The result of theoretical calculation was then compared with that experimentally obtained by the present authors or other investigators for several kinds of metallic materials. Good agreement was found between the result of the calculation and that of the experiment in those materials.
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Toshiyuki KITAZAWA, Ichiroh KAKO
1985 Volume 51 Issue 472 Pages
2789-2794
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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This paper is concerned with an eccentric compression experiment on carbon steel thin walled square pipes with various a/c rations in the short column range, supported with spherical seats. An empirical formula for calculating the eccentric compressive buckling stress"σ
ce"of the carbon steel thin walled square pipes is presented as follows: σ
ce/σ
cr=1/{1+2(e/c)}whereσ
cr=axial compressive buckling stress, e=eccentricity, c=mean distans between walls, a=length. The measurement reveals that the results calculated by this equation are in good agreement with those obtained experimentally for the short column range in the case of 4.1≥a/c≥1.0 and 0.6≥2e/c≥0.
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Kunio KOTANI, Minoru TANAKA
1985 Volume 51 Issue 472 Pages
2795-2798
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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The breaking bahaviour under a static three-point bending test on perforated notched specimens both of flake and nodular graphite cast irons have been studied. The results obtained are summarized as follows: (1) When the position of the perforation is suitable, the load carrying capacity and the absorbed energy increase, compared with non-perforated notched test pieces; (2) These improvements mentioned above are due to the passing length of the crack.
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Toshio FURUKAWA, Yoitiro TAKEUTI
1985 Volume 51 Issue 472 Pages
2799-2805
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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In usual analysis it is permissible to superpose the solution of pure thermal load problem on that of mechanical one. However, taking the thermomechanical coupling effect into account, such a superposition is not allowed. Nevertheless problems treated so far are pure thermal ones. Moreover pure thermal problems are not so much occurred in general. Thus it is important to investigate the influence of the mechanical load on temperature and stress distributions. In this paper a circular hollow cylinder under the thermal and mechanical loads is considered and it is pointed out that the influence of the mechanical load on temperature and stress distributions is considerable great and it can not be ignored.
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Hisao HASEGAWA
1985 Volume 51 Issue 472 Pages
2806-2810
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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This paper deals with an extension of a method of solution in terms of stress functions for dynamic problems of elasticity to the case of elastic solids with viscous damping. It is assumed that the damping forces considered in this paper are proportional to the velocity of motion of particles in a solid, and Hooke's law for stresses and strains is held. Stress functions of the so-called Galerkin typed and Neuber-Papkovich type in the three dimensional theory of elasticity and the Love type in axisymmetric problems of elasticity are investigated. Stress functions are also shown for axisymmetric dynamic body force problems of elasticity, taking into account viscous damping, and an example of their application is presented.
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Yoshisada MUROTSU, Masaaki YONEZAWA, Hiroo OKADA, Satoshi MATSUZAKI, T ...
1985 Volume 51 Issue 472 Pages
2811-2816
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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This paper successfully proposes a new method of searching for the best linearization point (β-point) in the Advanced First-Order-Second-Moment Method. The method has been applied to reliability analysis of a structural element subjected to a bending moment and axial force, and the failure probabilities evaluated by the various failure criteria are compared. It is concluded that a linearized failure criterion gives a conservative estimate of reliability of the structural element, and that it is also valid for the slenderness ratio of 40∼60.
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Takuya SEMBA, Yasuhiro TANI, Hisayoshi SATO, Hiroaki ODAKA
1985 Volume 51 Issue 472 Pages
2817-2822
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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A scanning acoustic microscope (SAM) is applied to measure the stress distribution in perforated polycarbonate film subjected to tensile displacement. The measurement is based on the theoretical estimation that the variation of Young's modulus, due to the material's non-linearity on low-impedance substances, can be detected by the strength of an acoustic intensity reflected from the water/film interface. The pattern of the wave-strength measured around the perforation corresponds well with that of the sum of the principal stress derived by the elastic-plastic FEM analysis, while that by the photo-elastic method shows a reduction in the principal stress.
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Tadashi HORIBE
1985 Volume 51 Issue 472 Pages
2823-2828
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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In this paper a formulation by integral equation method (I. E. M.) for beam-column problems is developed. The fundamental solution (i.e. Green's function) required for the formulation is also derived. Some numerical examples carried out by the above method are illustrated and compared with the exact ones. Moreover, the I. E. M. formulation is applied to the large deflection problems of abeam that is taken into account an axial elongation. And an iterative scheme, that has a numerical stability, to decide an axial force is proposed.
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Shigeo TAKEZONO, Katsumi TAO, Suguru NAGANO
1985 Volume 51 Issue 472 Pages
2829-2837
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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An analytical method of the elasto/visco-plastic problems of general, moderately thick shells of revolution subjected to asymmetrical loads is developed in consideration of the effect of shear deformations. The elasto/visco-plastic equations of Perzyna are employed for the constitutive relation. The fundamental equations of the elasto/visco-plastic problems derived for incremental values are numerically solved by a finite difference method, and the solutions are obtained by integration of the incremental valued. As a numerical example, the elasto/visco-plastic deformation of a cylindrical shell under locally distributed loads is analyzed, and the results are compared with those from classical theory which neglects the effect of shear deformations. It is shown from the comparison that in the elasto/visco-plastic problem of moderately thick shells, the difference between solutions from present theory and those from classical theory becomes significant.
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Eisuke TAKANO, Toshiaki HARA, Yoichi NEMOTO
1985 Volume 51 Issue 472 Pages
2838-2845
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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The principle of structural analysis by theε-method was investigated for a two dimensional multi-storied and multi-span rectangular rigid frame loaded vertically or horizontally, in cases where the base of columns of a rigid frame was constructed on the basis of theε-method, and various quantities were computed through this program. Theε-method, named by the authors, is one of the slope-deflection methods by which Tatumi
(1) has already reported various results relating to end moments, angles of rotation of each joint and each member, and other aspects of the multi-storied and multi-span rectangular rigid frame in general, figuratively, using the calculation table. Finally, the results calculated by the digital computing program were shown in several figures in the present paper.
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Ichiro MAEKAWA, Satoshi KOBAYASHI
1985 Volume 51 Issue 472 Pages
2846-2853
Published: December 25, 1985
Released on J-STAGE: February 21, 2008
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Impact compression experiments were carried out for steel specimens of which length were 20, 40 and 60 mm at 18, -72 and -185°C, respectively. The size of plastic region produced in a specimen by an impact compression depends on the length of specimen, which was longer for bottom end than that of upper impact end. These results were discussed based on the superposition of stress waves. When an impact compression was imposed on a specimen superposed on a static compression, equivalencies between the static stressσ
s andσ^^·
d which was stress gradient of a stress wave. Swelling over the plastic region observed by an interferometer corresponded to the consideration on the dynamic stress state in specimen. Distributions of hardness along the length of specimen were also studied.
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