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Akira KOBAYASHI
1984 Volume 50 Issue 450 Pages
113-118
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Tamotsu SASAKI, Haruhiko SHIBA, Tatsuo INOUE
1984 Volume 50 Issue 450 Pages
119-128
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Hideo KITAGAWA, Ryoji YUUKI, Hiroyuki KISU, Hiroki KAWABATA
1984 Volume 50 Issue 450 Pages
129-138
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Kazuo HAYASHI
1984 Volume 50 Issue 450 Pages
139-147
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Makoto ISIDA, Koichi HIROTA, Hiroshi NOGUCHI, Tadatsugu YOSHIDA
1984 Volume 50 Issue 450 Pages
148-157
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Toshizumi HIMEMIYA, Yasuhide SHINDO
1984 Volume 50 Issue 450 Pages
158-164
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Masaki SHIRATORI, Toshiro MIYOSHI, Yuichiro YOSHIDA, Chikashi SHITARA
1984 Volume 50 Issue 450 Pages
165-173
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Fumio NAGAI, Atsushi NAGASAWA, Yasuo SATO
1984 Volume 50 Issue 450 Pages
174-183
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Hiroshi TAKAHASI, Isao SHIONO, Norio CHIDA, Katsuaki ENDO
1984 Volume 50 Issue 450 Pages
184-190
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Eiichi TANAKA
1984 Volume 50 Issue 450 Pages
191-199
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Fusahito YOSHIDA, Shyuji YAMAMOTO, Misao ITOH, Masahobu OHMORI
1984 Volume 50 Issue 450 Pages
200-208
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Hiroshi KIGATAWA, Ryohei YOKOYAMA, Minoru HAMADA
1984 Volume 50 Issue 450 Pages
209-215
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Yoshio OHASHI, Masamichi KAWAI, Hiroshi SHIMIZU
1984 Volume 50 Issue 450 Pages
216-224
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Tadashi MIFUNE, Ryuichi MASUO
1984 Volume 50 Issue 450 Pages
225-229
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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This paper describes a new methodology, i.e. modified secant-formula method, for determining the plastic collapse load of non-sway framed columns. A new concept, i. e. a hypothetical yield stress, is proposed to apply the elastic beam theory to the inelastic buckling. An unified criterion for column strengths of many cases can be developed by the new concept. The theoretical results are verified by a model test.
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Sotoaki KIDA, Juhachi ODA
1984 Volume 50 Issue 450 Pages
230-235
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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The fracture patterns produced by concentrated impulsive loading on brittle cylindrical shells and their dependence on the impact velocity and the geometry of the shells are studied experimentally and theoretically. The experiments were performed using the impact of a steel ball dropped on the center of cylindrical shells made of plaster. The fracture behavior was photographed by a camera with a flash, and the crack-initiation time was measured using a memoriscope. Using the theory of flexural motion of a cylindrical shell, the authors explained theoretically the fracture behavior. Adding an impact-fracture criterion to this theory, the fracture patterns of brittle cylindrical shells could by predicted.
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Osamu MAJIMA, Kunio HAYASHI
1984 Volume 50 Issue 450 Pages
236-241
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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The probrems of elastic buckling and flexural vibration of annular plates under axisymmetric in-plane forces have been analyzed by the Galarkin method. By adopting natural vibration modes of the annular plate without in-plane force as admissible functions, these problems have been dealt with similarly for the various combinations of the boundary conditions at the outer and inner edges. Two cases, one is the case with uniform inner and/or outer pressures and other is with steady state thermal stresses caused by the temperature difference between inner and outer edges, have been analyzed as the examples of axisymmetric in-plane force distributions. The variation of the buckling load parameter with the hole size and the variations of the natural frequency parameters with the magnitude of the in-plane forces have been evaluated. It has been found that there is possibility of the buckling even in the case of the tensile in-plane force or the cooling, as the pattern of the stress distribution has compressive stress components.
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Juhachi ODA, Tetsuo NAYUKI
1984 Volume 50 Issue 450 Pages
242-247
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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In this paper, the finite element method to analyze the adhesive bonded structures, of which the adherends are the two-dimensional elastic bodies with the optional shapes, is proposed. In the analytical model, the adhesive layer is assumed as the spring elements transmitting only a shearing or a normal force. The stiffness matrices for these elements are formulated to match the well-known finite element methods for the in and out-plane analyses of plate. By using this method, a single lap joint and a cleavage models are analysed numerically. The former is the model of which the adhesive layer transmites only a shearing force, on the other hand the latter corresponds to the model transmitting only a normal force. These numerical results are compared with the values obtained by the corresponding theories.
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Akihiko KATAMINE, Tadamasa NISHIYAMA, Toshihiko FUKUHARA, Yasuhiro NOZ ...
1984 Volume 50 Issue 450 Pages
248-251
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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In order to clarify the Acoustic Emission (AE) characteristics of ceramics, the authors observed AE signals in the three point bending test of P L S Si
3N
4 specimen. For the specimen having bending strength over certain value, AS associated with slow crack growth is observed before final failure. At the elevated temperature, the same phenomena as well as at room temperature are observed. These results indicate that AE technique can be effective as a screening means for Si
3N
4.
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Kotoji ANDO, Masaya HORINO, Masumi SAKA, Nobukazu OGURA
1984 Volume 50 Issue 450 Pages
252-257
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Experimental investigation has been conducted to make clear the effects of initial crack length and loading system compliance on the tearing instability phenomena. J-integral fracture tests of A508cl.3 steel have been preformed on compact specimen in a test machine which employed coil string to produce high testing compliance. Tearing crack velocity was measured by using crack depth indicator. Results were analysed with respect to material and applied tearing moduli. Most stable-unstable behaviors are in good agreement with theoretical prediction. Loading system compliance and initial crack length have notable influence on J-integral at instability point and also maximum crack velocity.
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Kiyotsugu OHJI, Sang-Ryung KANG, Shunichi IWAKIRI, Keiji OGURA, Takao ...
1984 Volume 50 Issue 450 Pages
258-263
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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A method of evaluating the elastic-plastic fracture toughness (J
IC) by means of the electric potential technique wad developed. The relationship between J integral and electric potential was used, in which the data in the blunting and the stable crack growth processes were approximated by respective best-fitted lines. The onset of ductile tear cracking was defined by the intersection of these two lines. A procedure of optimizing detectability of the intersection was proposed. The J
IC values of several high- and medium- strength steels were determined by this method. The J
IC values thus obtained were compatible with those determined by the JSME R-curve method. The use of side-grooved specimens improved remarkably the detectablility of crack initiation of low-strength high-toughness steels by the electric potential technique. The present thickness requirement imposed on the JMSE standard. J
IC test specimens may be relaxed when properly side-grooved specimens were employed.
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Kiyotsugu OHJI, Sang-Ryung KANG, Shunichi IWAKIRI, Shigeki NAKAGAWA
1984 Volume 50 Issue 450 Pages
264-269
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Deformation of stretched zones during stable crack growth (stages II and III) in J
IC tests was examined by observing stereographically relations between apparent critical stretched zone width (SZW
C) and crack tip opening desplacement. The average value of the apparent SZW
C along the crack from continued to increase with increase in J during the extension of tear region along the crack from from 20%, at which crack initiation and SZW
C were defined by the JSME standard, to 100% in length (stage II). In the stable tear crack growth stage (stage III), SZW
C was also deformed consiferable with low-strength high-toughness steels and, to a lesser extent, with high strength high-SZW
C steel and medium-strength steel, but not with high-strength low-SZW
C steel. A new procedure of SZY method was proposed to obtain J
IC values compative with those by the R-curve method, by avoiding errors due to the SZW
C deformation.
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Hiroshi KITAGAWA, Yasunori TANIZAWA
1984 Volume 50 Issue 450 Pages
270-276
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Plastic instability phenomena of chick walled circular tube under external pressure, in addition to which axial force and bending moment are applied, are analysed numerically by a three dimensional finite element method. The affection of axial force and bending moment on the axisymmetric and non-symmetric bifurcation points, which are regarded as an onset on unstable inhomogeneous deformation, are examined in relation to the constitutive expressions of the material. The effect of deformation constraint at the ends on the collapsing process, that is, post-bifurcation behavior is discussed according to the results of numerical simulations. Finally it is pointed out that since application of bending moment produces oval deformation in a a cross section at the early deformation stage, it accelerates significantly the collapse of the tube.
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Hironobu NISITANI, Norio KAWAGOISHI
1984 Volume 50 Issue 450 Pages
277-282
Published: February 25, 1984
Released on J-STAGE: February 21, 2008
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Fatigue crack growth laws were investigated in connection with the reversible plastic zone size at a crack tip by the rotating bending test of a Fe- 3%Si alloy. The main results obtained are as follows: (1) The crack growth rate is expressed by the following two equations. (a) Under a small scale yielding. dl/dN=C
1ΔK
m (l:crack length, C
1 and m:constants). (b) Under a high stress level, dl/dN=C
2σ
nl (σ:stress amplitude, C
2 and n:constants). (2) On the other hand, regardless of the scale of yielding, dl/dN=C
3r
prev (r
prev:reversible plastic zone size at crack tip, C
3:constant). (3) From the relation in (2), the physical backgrounds of the two crack growth laws in (1) and the presence of a non-propagating crack can be explained.
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