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Tsuneshichi TANAKA, Yusuke FUKUCHI, Masashi TERAYAMA
1985 Volume 51 Issue 468 Pages
1904-1911
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Akira KATO
1985 Volume 51 Issue 468 Pages
1912-1918
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Toshihiko HOSHIDA, Katsuhiro IWAZAKI, Toshiro YAMADA
1985 Volume 51 Issue 468 Pages
1919-1927
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Minoru HAMADA, Taro HARIMA
1985 Volume 51 Issue 468 Pages
1928-1934
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Shinji TANIMURA, Yoichi KITAMURA
1985 Volume 51 Issue 468 Pages
1935-1940
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Eiichi TANAKA, Sumio MURAKAMI, Masahiro OOKA
1985 Volume 51 Issue 468 Pages
1941-1950
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Megumu SUZUKI, Hiroshi NAKANISHI, Masaharu IWAMOTO, Nobukazu TANAKA, A ...
1985 Volume 51 Issue 468 Pages
1951-1957
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Shuhei OHSAKI, Tsuneo TAKAHASHI
1985 Volume 51 Issue 468 Pages
1958-1966
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Takao HIGASHIMACHI, Yoshitaka EZAWA, Noriaki OKAMOTO, Tamio AIZAWA
1985 Volume 51 Issue 468 Pages
1967-1972
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Masatoshi TSUJI, Yoshinobu TANIGAWA, Yoitiro TAKEUTI
1985 Volume 51 Issue 468 Pages
1973-1976
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Hideto SUZUKI, Masaru OHYABU, Tadashi UEKI, Takeshi KUNIO
1985 Volume 51 Issue 468 Pages
1977-1982
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Influence of the casting size and the heat treatment (T6) on the fatigue strength of Al-Si alloy castings (AC 4A) under the repeated tension-tension loadings were examined. The fatigue strength decreased with increasing the casting size. T6 heat treatment increased the fatigue strength, but it decreased the ratio of 10
7σ
ωto σ
UTS from 1/2 to 1/3. Through the fractography using SEM, it was shown that the size of the porosity initiating the fatigue crack in the large casting was larger than its size in the small casting. Decreasing the size of porosity improved the fatigue strength. The effect of size of porosity on fatigue strength can be interpreted as the size of small notch on the propagation of short crack initiated at the porosity. Hardening the matrix microstrucutre by T6 heat treatment increased the notch sensitivity of porosity and decreased the ratio of fatigue strength and tensile strength.
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Masayuki SHIMA, Jun'iti SATO, Hideo KOGUCHI
1985 Volume 51 Issue 468 Pages
1983-1989
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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This paper is concerned with the plane-strain problem of an elastic surface layer bonded to a hale-space elastic body on which an elastic cylinder is pressed by a normal load or inclined load. Contact stresses of the layer are calculated as a function of the elastic properties of the layer material and the layer thickness. Especially, contact stresses at the layer-body interface are investigated in detail for the possible practical applications. The results show that maximum shear stress at the interface which can lead to coating debonding is markedly affected by the Young's modulus and the layer thickness and that normal stress parallel to the interface can be in tention under a normal load only if the Young's modulus of the layer is greater than that of the body.
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Masumi SAKA, Hiroyuki ABE
1985 Volume 51 Issue 468 Pages
1990-1994
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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A path-independent integral, j
t is newly introduced for the analysis of steady temperature distribution near the tip of a crack in a homogeneous isotropic conductive plate with the steady current. By making use of the j
t-integral together with the j
e-integral, which has been introduced by the authors for the electric crack problems, an asymptotic solution is presented for the steady temperature distribution. It is shown that directly ahead of the crack, the temperature remains constant along the crack line. Finally, the temperature along the crack line of an edge crack in a conductive strip is determined analytically as a function of the crack length, the far-field temperature, and the total current introduced on the strip.
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Toshimitsu JR. YOKOBORI, TAKEO YOKOBORI, Hiroshi NISHI
1985 Volume 51 Issue 468 Pages
1995-2002
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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The study concerns computer simulation of dynamic piling-up behaviour of dislocations emitted from the source against the grain boundary. As the number of dislocations emitted increases, the stress singularity near the pile-up approaches to reveal 1/√r characteristics, where r= the distance from the pile-up outward. The dynamic stress intensity factor by the dislocation piling-up was obtained in analytical equation in terms of stress application rate, grain size and materials constants. The comparison of the results was made with the static (equilibrium) result. Finally, the result was applied to the dynamic yielding strength of steel, and it is in good agreement with the experimental data in literature.
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Shun-ichi KAWANO, Shigetoshi SHIMIZU, Moriyoshi MAMIZUKA
1985 Volume 51 Issue 468 Pages
2003-2007
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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The JSME standard (S-001) for determination of J
IC recommended to draw the blunting line or to measure the stretched zone width by an electron microscope. However, this procedure is taken trouble to measure these values. Following the British Standard BS5762, the CTOD value, Φ
i, at the onset of the ductile fracture is determined by using the CTOD versus fibrous crack extension. Since the fibrous crack extension may be measured by an optical instrument such as a travelling microscope the CTOD procedure is convenient in comparison with the J
IC procedure. It is expected to evaluate J
IC with J-CTOD relationship, if this relation ensures the linear function of CTOD. This paper proposed the method of determinating J
IC with J-CTOD relationship. To examine the validity for the evaluation of J
IC by using the proposed method, the fracture toughness tests were performed for HT60, SCW49 and SS41, respectively.
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Yoshiharu MUTOH, Isao SAKAMOTO, Keiichi NOMURA, Kenji AYA
1985 Volume 51 Issue 468 Pages
2008-2013
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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ASTM E 813-81 in USA and JSME S 001-1981 in Japan, Which are concerned with standard test method for fracture toughness J
IC have been published. From the industrial and practical point of view, it is as a matter of course that a more economical and convenient test method is desired. In the present study, a significantly simple test method for evaluating J
IC by suing a single Charpy-size specimen with a side-groove has been investigated. The materials used in the present study were SM50 A steel, HT 80 steel and SNCM 8 steel. It was found that B
e2 (=B-(B-B
N)2/B) is proper as the effective thickness of side-grooved specimens for calculating J-values. The maximum load point was found to coincide with the ductile crack initiation point in the 25% side-grooved Charpy-size specimen with the crack length to width ratio a/W of 0.6 From the foregoing results, a quite simple and convenient test method for estimating J
IC has been proposed.
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Masao SHIBAHARA, Tadashi TAMURA
1985 Volume 51 Issue 468 Pages
2014-2017
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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This paper is concerned with the dynamic fracture criterion and the dynamic fracture behaviors of the cracked cantilever which is subjected to transversal impact on the free end. By means of dynamic photoelastic method using the image converter camera IMACON-790, the change of the dynamic stress intensity factor and the crack propagation phenomenon are analysed. As the results, the dynamic fracture toughness K
cd is constant without regard to the variance of the crack length, which is similar to the static fracture toughness K
cs, and value of K
cd is about 80% of K
cs Moreover, in all experiments, the crack grows in the direction to the fixed end of the beam, and the reasons are made clear.
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Masaaki WATANABE, Hisashi NISHIMURA
1985 Volume 51 Issue 468 Pages
2018-2026
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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To examine the mechanical behavior of sheet metal forming under strain or stress gradient, tensile test of notched Zn-Al superplastic alloy sheets was carried out under the conditions of several elevated temperatures and tensile speeds. A constitutive equationσ=Kε^^·
mε
n was applied to the plastic flow of the material. It was found that strain distributions on the net section, the direction of principal axes and the ratio of principal strains in plane were determined by the notch shape only i.e. initial depth and root radius of notch. And, maximum longitudinal stress on the net section moved from root to center with increase of elongation. Therefore, notched specimen deformed up to the ultimate ductility of material, if this maximum stress was not beyond the inherent stress. Furthermore, the propagation of strain in the longitudinal direction of specimen was determined not by m-value and n-value but also by factor Kε^^·
mε
n/exp ε.
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Yoshio OHASHI, Masamichi KAWAI, Toshiya MOMOSE
1985 Volume 51 Issue 468 Pages
2027-2035
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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History effects of plastic prestrain on subsequent creep behavior were studied experimentally for type 316 stainless steel at 650°C. The plastic prestrain was first applied to thin-walled tubular specimens in the axial tensile direction, and then subsequent constant load creep tests were carried out under various multiaxial states of stress with an identical equivalent stress. Furthermore. variations in creep resistance caused by the plastic prestrain were compared with those caused by the same amount of creep prestrain. In experimental results, it was shown that the increase in creep resistance appeared differently depending on the amount and relative direction of plastic prestrain, and that the increase appeared more markedly for creep prestrain than the same amount of plastic one.
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Takeji ABE, Shigeru NAGAKI, Yuji MAETA, Yutaka OKABE
1985 Volume 51 Issue 468 Pages
2036-2041
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Inhomogeneous deformation at the free surface of copper specimen during compressive plastic deformation is studied. The inhomogeneous deformation of grains in the plane of specimen surface is observed by scanning electron microscope, while the inhomogeneous deformation perpendicular to the surface is studied by measuring surface roughness. It was found that the variations of the measured values of strain in each grain as well as the surface roughness in crease with the applied strain. Discussion is made on the relation between the variations of strain in each grain and the surface roughness.
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Takeji ABE, Shigeru NAGAKI, Mitsuaki FURUNO
1985 Volume 51 Issue 468 Pages
2042-2047
Published: August 25, 1985
Released on J-STAGE: February 21, 2008
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Taylor's slip model is incorporated with the rigid-plastic finite element analysis based on the upper bound theorem. Five independent slip systems are assumed to operate in each grain and the principle of the maximum plastic work proposed by Bishop and Hill is used to select the five operating slip systems out of twelve slip systems in fcc crystals. For the numerical calculation, a simple plane model of polycrystals is adopted which is composed of rectangular grains. Discussions are made on the characteristic feature of the plastic deformation of polycrystals.
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