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Tatsuo INOUE
1984 Volume 50 Issue 451 Pages
285-290
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Kenji HATANAKA, Tatsuro FUJIMITSU
1984 Volume 50 Issue 451 Pages
291-300
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Hironobu NISITANI, Satoshi TANAKA
1984 Volume 50 Issue 451 Pages
301-308
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Hideo KOBAYASHI, Takeshi OGAWA, Haruo NAKAMURA, Hajime NAKAZAWA
1984 Volume 50 Issue 451 Pages
309-319
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Toshihiko HOSHIDE, Satoshi FUJIMURA, Toshiro YAMADA
1984 Volume 50 Issue 451 Pages
320-329
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Makoto ISIDA, Dai-heng CHEN, Hironobu NISITANI
1984 Volume 50 Issue 451 Pages
330-340
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Hironobu NISITANI, Dai-heng CHEN, Makoto ISIDA
1984 Volume 50 Issue 451 Pages
341-350
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Masao TANAKA, Yasuyuki SEGUCHI
1984 Volume 50 Issue 451 Pages
351-361
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Masahiro UEDA, Takashi KANO, Atsushi YOSHITOSHI
1984 Volume 50 Issue 451 Pages
362-372
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Toshio SUGIBAYASHI, Kozo IKEGAMI
1984 Volume 50 Issue 451 Pages
373-382
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Hisaaki TOBUSHI, Yutaka NARUMI, Yoshio OHASHI, Watatomi NAKANE
1984 Volume 50 Issue 451 Pages
383-390
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Yoitiro TAKEUTI, Yoshinobu TANIGAWA, Ryohei ISHIDA, Tatsumi MASUDA
1984 Volume 50 Issue 451 Pages
391-397
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Yoshihiro SUGANO, Toshiya MAEKAWA
1984 Volume 50 Issue 451 Pages
398-407
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Yuji SUGITA
1984 Volume 50 Issue 451 Pages
408-416
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Koichiro KAWASHIMA, Takafumi YOSHIDA
1984 Volume 50 Issue 451 Pages
417-423
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Yasushi NIITSU, Kozo IKEGAMI
1984 Volume 50 Issue 451 Pages
424-431
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Hitoshi MORITOKI, Shinzo NISHIMURA
1984 Volume 50 Issue 451 Pages
432-439
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Masafumi SENOO, Toru NISHIMURA, Motohisa HIRANO
1984 Volume 50 Issue 451 Pages
440-447
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Mitsunori MIKI
1984 Volume 50 Issue 451 Pages
448-455
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Seiichiro KITAOKA, Yasuo NAGASE
1984 Volume 50 Issue 451 Pages
456-462
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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In order to evaluate the stress intensity factor of Mode I crack, the grain growth in the electro-deposited copper foil and the slip-initiation phenomena in the recrystallized foil are applied. Taking note of the fact that these phenomena are controlled by shearing stress amplitude, the crack opening displacement and the stress concentration near the crack tip region n the center cracked plated made of carbon steel are measured by applying these foils bonded to it. The stress intensity factor calculated with use of measured values is rather in good agreement with numerical solution. It is concluded that these methods can be applied for evaluating the stress intensity factors of Mode I cracks.
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Masanori KIKUCHI, Hiroshi MIYAMOTO, Mitsugu TANAKA
1984 Volume 50 Issue 451 Pages
463-470
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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CT specimens are analyzed elastic-plastically by the 3 dimensional finite element method and the distributions of the 3 dimensional J integral along the crack front are obtained. For 1CT specimens without side groove, the J value at the center of the plate is the maximum and the minimum near the surface. It is shown that the change of both values becomes smaller by introducing the curved crack front assuming the fatigue precrack. For the side grooved specimen, the experimental J value using the net thickness is better than that by using the effective thickness. It is shown that the J value is nearly equal along the crack front for 25% side grooved specimen. For every cases, the J value obtained by the load versus displacement curve coincides well with the average J value over the plate thickness.
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Takayuki WATANABE, Noriyuki MIYAZAKI, Genki YAGAWA
1984 Volume 50 Issue 451 Pages
471-476
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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In this paper, the methods for evaluating the nonlinear fracture mechanics parameters J-and J^
--integral are discussed in the framework of the virtual crack extension method. The equation for the virtual crack extension method was derived to evaluate the J-integral from the viewpoint different from the original method proposed by Parks or Hellen. Moreover, the equation for evaluating the J^
--integral was derived using the same procedure as in the J-integral. The relation between the contour integral and virtual crack extension method is also discussed. Several numerical examples are presented to verify the validity of the equations derived in this paper.
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Toshiro MIYOSHI, Masaki SHIRATORI, Yuichiro YOSHIDA, Osamu TANABE
1984 Volume 50 Issue 451 Pages
477-482
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Stress intensity factors of two identical surface cracks which are located closely or partly overlap in a finite plate under tension have been analyzed using newly developed line spring method. The new line spring method which is composed of Ahmad's thick shell element and the quadratic line spring element has been applied to the analysis of the stress intensity factors of various single surface cracks and the results showed good agreement with Raju-Newman's solution. Stress intensity factors of closely located twin cracks can be estimated according to ASME Code and the values are compared with fully numerical analysis y the line spring method. ASME Code always gives the conservative values of stress intensity factors. In case of overlapped twin cracks, the analysis by the line spring method shows that the stress intensity factors can be very high at the crossed point of two cracks.
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Genki YAGAWA, Koichi KASHIMA, Nobuyuki KATO, Masahiro SAITO, Kunio HAS ...
1984 Volume 50 Issue 451 Pages
483-488
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Experimental results on fracture behaviors of type 304 stainless steel pipes with artificial part-through cracks in the circumferential direction are presented. The experiments are preformed in the BWR environment in terms of pressure, temperature and water chemistry under the cyclic tension loading with a high compliance test apparatus. Based on the test results, the break condition for pipes is found to be well represented by the net section stress approach. The leak before break condition is also studied by comparison of critical crack lengths for break and for detectable leak. From this evaluation, it is found that the former is considerably larger than the latter under the design stress condition and that the margin for the leak before break becomes bigger with the smaller compliance or the larger pipe diameter.
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Yoshiharu MORIMOTO, Takuo HAYASHI, Noriyuki YAMAGUCHI
1984 Volume 50 Issue 451 Pages
489-494
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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A scanning moire method is a moire method in which the master grating is replaced by the scanning lines of a television camera. In the present paper, the principle of moire pattern appearance, the effects of thinning out of scanning lines and the relation between moire fringes and strain are studied by the sampling theorem. I)f a deformed model grating is sampled by a television camera and it is thinned out properly by using image processing system, the strain distribution with wide strain range can be analyzed from one picture.
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Yohtaro MATSUO, Akira NOZUE
1984 Volume 50 Issue 451 Pages
495-500
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Vickers and Knoop indentation tests were performed on alumina ceramic specimens with measuring acoustic emissions. In Vickers indentation test, the Weibull plots of the threshold load Pth, at which total AE energy begins to burst, seem to obey 2-parameter-Weibull distribution function, while those in Knoop indentation test seem to obey the combined Weibull distribution function. The ratio of the numbers of the specimens, in which Pth were observed, versus total numbers of the specimens were 62% in Vickers indentation, and 41% in Knoop@ indentation. Some additional differences were observed between Vickers and Knoop indentation tests.
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Toshiaki HISADA, Shigeru NAKAGIRI, Takaya NAGASAKI
1984 Volume 50 Issue 451 Pages
501-506
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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When members having uncertainty in length are assembled into a frame structure, uncertain initial stresses are generated in it. This may influence the buckling load which is related with structural safety and reliability. Stochastic finite element method on the basis of the second order perturbation technique is developed in this class of problem and the formation for two dimensional frame structure is presented. The rates of change of eigenvalue for plural random variables are efficiently computed based on the single solution of the governing equation. It is demonstrated in numerical examples that the expectation and variance of buckling load are successfully evaluated for given moments of random variables.
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Kazuyuki TSUKIMORI, Yoshiaki YAMADA, Hideo KITAGAWA, Ryoji YUUKI
1984 Volume 50 Issue 451 Pages
507-513
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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In this paper, a new method for the elastic-plastic structural analysis of beams and plates is developed with use of the interaction curve between the membrane forces and the bending and twisting moments in construction of element stiffness matrices. This method is efficient and physically simple with comparison of the conventional methods, especially in the numerical analysis of the elastic-plastic response of beams and plates. The geometrical nonlinearity is also involved in this formulation. As finite elements, the conventional beam-elements are used for beam structures and modified BCIZ plate bending elements are used for plate structures. Several examples of beams and plates subjected to explosive loadings are demonstrated, and the results by this method are discussed compared with the results by conventional methods.
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Nobuyuki KOBAYASHI, Kazuo ISHIDA
1984 Volume 50 Issue 451 Pages
514-519
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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When an earthquake hitting, the part of the bottom plate of the unanchored cylindrical tank will be lifted up from the foundation so that no resistance mechanism is existed against the uplift force caused by the overturning moment. The high stresses will be yielded in the bottom plate and the shell plate. This report concerns those problems. The calculation model was made in order to obtain the uplift resistance force, the uplift height, the reaction force from the foundation and the uplift region. In this model, the uplift region was considered as crescent shape, and the elasto-plastic, large deformation effect and the contact problem of the bottom plate was considered. From the comparison between this calculation model and the static tilt test of a thin bottom plate model tank, the calculation result was good agreement with the test.
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Hideto SUZUKI, Masaru OUYABU, Tadashi UEKI, Takeshi KUNIO
1984 Volume 50 Issue 451 Pages
520-525
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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The fatigue strength of the compacted vermicular cast iron and the nodular cast iron with a ferrite and/or a pearlite matrix was tested under tension-tension loading and their microscopic fatigue fracture processes were examined by SDEM and EDS. Results were as follows: (1) The fatigue limit σ
W was proportional to Vickers hardness H
V. (2) The ratio of σ
W to σ
UTS for the cast iron with a ferrite matrix was larger than that for a pearlite matrix. (3) The nodular cast iron with a pearite matrix had a highest fatigue limit. Futher, finig spheroidal graphite by the metal mold increased the fatigue limit. (4) The change shape of graphite induced the different mechanism of fatigue crack initiation. It could be interpreted that this fact controlled the fatigue limit.
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Yasuaki SUZUKI
1984 Volume 50 Issue 451 Pages
526-533
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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Adhesive tensile strength of scarf joints with various scarf angles and butt joints with various adhesive layer thicknesses have been measured to study fracture criterion of joints of steel plates bonded by brittle epoxy adhesive. For those joints, three-dimensional elastic stress analysis was performed by FEM. Fracture of both joints were explained quantitatively by introducing the boundary layer depth of 0.035 mm at free surfaces of adhesive layers and obeyed maximum principal depth of 0.035 mm included most of stress concentrated area at free surfaces. Locations of fracture initiation and fracture modes of adhesive layers observed with a optical microscope and a scanning electron microscope were agreed with those expected from stress distributions and boundary layer conception.
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Kouetsu YAMAZAKI, Juhachi ODA
1984 Volume 50 Issue 451 Pages
534-539
Published: March 25, 1984
Released on J-STAGE: February 21, 2008
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A theoretical method to determine an optimum shape of inclusion within an elastic infinite solid, which is subjected uniformly to triaxial loading condition, is proposed. The Eshelby's solution on the elastic body with an ellipsoidal inclusion is used in the method and the optimum ratios between principal axes of the ellipsoid are determined so as to uniformalize the distribution of the stress components, normal and tangential to the boundary, of the inclusion. From the numerical results for the models with the typical elastic stiffness ratios of the inclusion to the matrix, it is appeared that the ellipsoid becomes slender according as the applied axial stress ratios become distant from unit. Furthermore, optimum shape of the elliptic inclusion in the two dimensional stress field is also determined, and the relations between the optimum ratio of principal axes of the ellipse and the applied stress are shown explicitly.
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