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- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C
- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
- Transactions of the Japan Society of Mechanical Engineers Series C
- Transactions of the Japan Society of Mechanical Engineers Series B
Volume 53, Issue 485
Displaying 1-25 of 25 articles from this issue
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Hiromitsu ONO, Koji KOIBUCHI1987 Volume 53 Issue 485 Pages 1-5
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSLocal strain at welded toes is the most critical factor in fatigue strength estimation of welded structures. The local strain approach was evaluated as an estimation method for fatigue strength of complicated structures. Pulsating fatigue tests were carried out for four types of bracket structures which transmit external forces to box structures and for two types of flanged pipe structures using mild steel (SS 41). The local strain was measured using small strain gauges bonded directly to the welded toes of highly stressed structure parts during the fatigue tests. The crack initiation life was defined at number of cycles till cracks became visible at the welded toe. All the data points fell in the scatter band of aΔσ(=E·Δε)-Nc curve. The local strain approach is very useful in analyzing the fatigue strength of welded structures, because it is independent of the structure types.View full abstractDownload PDF (834K) -
Hideto SUZUKI, Takashi KUNIO1987 Volume 53 Issue 485 Pages 6-10
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn order to examine the effects of tightening bolts into a plastic region on fatigue strength, close-to-practice tests on the fatigue performance and the dynamic loseness were conducted or the cap bolt of a connecting rod used (actually) in a diesel engine. The fatigue strength of a bolt tightened by the present method has been found to be better than that of the conventional elastic-controlled method. The residual axial tension of bolts tightened by the present method was still superior to that of bolts tightened by the other method. The fractographic examination using SEM showed that the fatigue crack of bolts tightened with the present method was initiated and propagated under a smaller cyclic plastic deformation than that tightened with the elastic method.View full abstractDownload PDF (930K) -
Hironori MAIKUMA, Masao SHIMIZU, Kazuhiro KAWASAKI1987 Volume 53 Issue 485 Pages 11-16
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSLocal strain at welded toes is the most critical factor in fatigue strength estimation of welded structures. The local strain approach was evaluated as an estimation method for fatigue strength of complicated structures. Pulsating fatigue tests were carried out for four types of bracket structures which transmit external forces to box structures and for two types of flanged pipe structures using mild steel (SS 41). The local strain was measured using small strain gauges bonded directly to the welded toes of highly stressed structure parts during the fatigue tests. The crack initiation life was defined at number of cycles till cracks became visible at the welded toe. All the data points fell in the scatter band of aΔσ(=E·Δε)-Nc curve. The local strain approach is very useful in analyzing the fatigue strength of welded structures, because it is independent of the structure types.View full abstractDownload PDF (807K) -
Masahiro JONO, Atsushi SUGETA, Shigeharu OKUMURA1987 Volume 53 Issue 485 Pages 17-25
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSFatigue crack growth tests were carried out on P/M (Powder Metallurgy) Al-Si-Fe alloy in vacuum and in air under ΔK-increasing and-decreasing conditions, and crack growth rates and crack closure behavior were investigated in detail by using the unloading elastic compliance method. The effect of anisotropy of the material due to extrusion process on crack growth characteristics was also examined. Fatigue crack growth resistance in terms of ΔK and ΔKeff was usually increased in a vacuum. The degree of increase, however, was found to depend on crack growth direction in relation to the anisotropy of the material and on crack growth rate regime. Crack opening point was different between material anisotropy directions but could well be correlated to the roughness of fracture was dominant in air, while that in vacuum was found to take similar values irrespective of material anisotropy directions and of macroscopic appearance of the fracture surface.View full abstractDownload PDF (1320K) -
Shoji HARADA, Tatsuo ENDO, Yoshihiro FUKUSHIMA, Toshimitsu SAKATA1987 Volume 53 Issue 485 Pages 26-32
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe microcrack growth law-oriented approach developed in a previous paper is applied to examine the fatigue strength and mechanism of 200 mm and 100 mm thick forged steel plates. Low-cycle fatigue tests are conducted on specimens sliced in the transverse (T) and thickness (S) directions of the plates. Through continual observation of the fatigue process, the effect of elongated inclusions on microcrack initiation and propagation behaviors is elucidated. The fatigue life is shorter in the S than in the T direction. The fatigue lives in both directions are evaluated on the basis of the microcrack propagation law. The elongated inclusions hardly affect the fatigue process in the T direction, while they show a strong influence in the S direction. The fatigue process is dominated by a monotonous growth of a leading crack in the T direction. On the contrary, the leading crack growth in the S direction is governed by a joining of subcracks.View full abstractDownload PDF (920K) -
Yutaka IINO, Gerhard ELSSNER1987 Volume 53 Issue 485 Pages 33-38
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSFracture toughness of solid-state-bonded Al2O3/Ni and Al2O3/Ni-Y interfaces was studied. Fracture toughness of the Al2O3/Ni interface was smaller than Al2O3, while that of the Al2O3/Ni-Y interface was larger than Al2O3. Cracks in the Al2O3/Ni system propagated along the interface and no reaction was observed at the interface. Cracks in the Al2O3/Ni-Y system propagated not along the interface but in Al2O3. From the results of the microstructural and fractographic observations and EPMA, it is concluded that the higher fracture toughness in the Al2O3/Ni-Y system is due to the keying effect of the products formed by the reaction between Al2O3 and Y at the interface.View full abstractDownload PDF (1268K) -
Tsunenori OKADA, yoshiro IWAI, Kaoru AWAZU1987 Volume 53 Issue 485 Pages 39-45
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSto study the cavitation erosion behavior of interface and base metal for platings, magneto-strictive erosion tests were carried out in a 3% NaCl solution using a 0.18% carbon steel specimen plated thinly with zinc, tin, chromium or nickel. When erosion attack extends to the interface between the plating and base metal, chromium or nickel plating which is more noble than base metal forms a rough surface because of the difference of hardness and electrochemical corrosion at the interface, even though it shows high erosion resistance in itself. Thus the protective effects of thin and hard plating disappears immediately. However, the platings of metal such as zinc or tin become effective because of the electrochemical reactions of the plating layer remaining on the surface outside the eroded area.View full abstractDownload PDF (850K) -
Norio TAKAHASHI, Takanori KUGIMIYA, Toshiyuki SEKI, Ken TERAO, Takahik ...1987 Volume 53 Issue 485 Pages 46-54
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSCavitation that cause erosion of the metal surface is regarded as harmful. But in this study, the phenomenon of erosion on metal surfaces by cavitation is used positively for metal working, surface treatment and for the reappearance of "coined and shaved off" characters. In the experiments, cavitation was generated in water by ultrasonic vibration of 20 kHz. The main results of the studies are as follows ; (1) "Coined and shaved off" characters on metal surfaces are restored by ultrasonic cavitation. (2) The fatigue limits of mild steels increase by exposing the surface to an ultrasonic cavitation flow. (3) Erosion working by radiation of ultrasonic cavitation is useful for cutting work. The relations among the shapes of the terminal rod of the vibrating system, the working conditions of the process and erosion patterns are made clear. (4) The vibration mode of the terminal rod specially designed for generating cavitation is analyzed by the finite element method.View full abstractDownload PDF (1083K) -
Hisao HASEGAWA, Kunio KUMAMOTO, Kenji IMAI1987 Volume 53 Issue 485 Pages 55-60
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThis paper deals with stress consentration problem of an elastic strip with a central hole and two supplemental holes under tension. An investigation is made for the stress mitigations due to interface effects of stress concentrations by supplemental holes. The influences of the distances between the central and supplemental holes and radii of the holes on the stress mitigations are shown. A principle of the method of solution is to distribute body forces in the interior of a strip with no hole and to determine the intensities of the body forces distributed so as to satisfy the boundary conditions at the holes. For this purpose, we apply Green's functions for body force problems of a strip. The method of solution may be regarded as a kind of the so-called indirect boundary element method with fictitious boundary.View full abstractDownload PDF (666K) -
Hideaki KASANO, Tsuneo WATANABE, Hiroyuki MATSUMOTO, Ichiro NAKAHARA1987 Volume 53 Issue 485 Pages 61-69
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe plane elastostatic problem for a bonded plane consisting of an isotropic and an anisotropic half planed is considered when a straight crack originating in one half-plane is passing through a bimaterial interface into an other. It is assumed that the crack is normal to the interface and that the bonded plane is subjected to a constant strain away from, and perpendicular to, the crack. A fundamental stress field due to two colinear edge dislocations existing in each half plane is firstly analyzed, and then the method of continuous distribution of dislocations reduces the problem to a system of simultaneous singular integral equations for the dislocation density. The singular behaviour of stresses at the point of intersection of the crack and the interface as well as at the crack-tips in investigated in detail.View full abstractDownload PDF (891K) -
Masataka TANAKA, Kenichi MIYAZAKI1987 Volume 53 Issue 485 Pages 70-76
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThis paper is concerned with the boundary element method for the elastic buckling analysis of assembled plate structures. First, we discuss a boundary element approach to the elastic buckling problem of a single plate with arbitrary from subjected to any boundary conditions. The so called boundary-volume element method is used for the numerical solution of the resulting integral equations. Thus, the final set of equations can be reduced to algebraic eigenvalue equations. Next, the proposed method of solution is extended to the elastic buckling analysis of assembled plate structures. Numerical implementation of the compatibility and equilibrium equations on the joined edge is discussed in some detail. Finally, a few sample problems are computed and the results obtained are compared with other solutions, whereby the usefulness of the proposed method is demonstrated.View full abstractDownload PDF (784K) -
Shigeyasu AMADA1987 Volume 53 Issue 485 Pages 77-83
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe equation of motion in the radial direction for a rotating disc contains the product of the circumferential displacement and the angular acceleration of the disc. It is anticipated that circumferential deformation has a considerable influence on radial displacement with the increase of the angular acceleration has a considerable influence on radial displacement with the increase of the angular acceleration. This influence is discussed in this paper. Adopting the cyclically varying rotations given by ω^-(t^-)=Ω^-1 sin (Ω^-2 t^-), Ω^-1, Ω^-2 : constants the displacements are computed for various values of Ω^^21. The maximum amplitudes Δu^- and Δu^-' for the radial displacements with and without the circumferential deformation are discussed with respect to a non-dimensional quantity ζ =Ω^-1/Ω^-2.View full abstractDownload PDF (726K) -
Tadaharu ADACHI, Hiroyuki MATSUMOTO, Sadayuki UJIHASHI1987 Volume 53 Issue 485 Pages 84-90
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe coupled response of a fluid-filled semi-infinite circular cylindrical shell with one end clamped subjected to waterhammer waves is analyzed on the basis of the potential theory for perfect fluid and Flugge's theory for a shell. Assuming the continuity of velocity on the interface of fluid and shell, the analytical method combined with Laplace transformation and the numerical inverse transformation with the use of the FFT is used. As a result, the coupled response is different from the uncoupled one, and the coupled response wave has the maximum value near the wave front and is reduced to a value of the static state with the lapse of time. The analytical method employed in this paper will be very useful in fluid-structure interaction problems.View full abstractDownload PDF (757K) -
Toshiyuki SAWA, Hirohisa ISHIKAWA, Katsuhiro TEMMA, Akihiro IWATA1987 Volume 53 Issue 485 Pages 91-96
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThis paper deals with a three-dimensional stress analysis of adhesive butt joints subjected to tensile loads in order to contribute to an establishment of the fracture criteria of joints. Similar adherends and an adhesive bond are replaced with finite solid cylinders in the analysis. Stress distributions in adhesive joints are analyzed strictly by using the three-dimensional theory of elasticity. The effects of stiffness and thickness of the adhesive bonds on the normal and the shear stress distributions are shown by numerical computations. The analytical result is also compared with the result obtained by F. E. M. in order to verify the stress distributions in the adhesive bonds. It is shown that they are in fairly good agreement.View full abstractDownload PDF (656K) -
Shigeo TAKEZONO, Kohji MIGITA1987 Volume 53 Issue 485 Pages 97-105
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe paper describes an analytical formulation and a numerical solution of the creep problems of multi-layered moderately thick shells of revolution under asymmetrical loads with application to a cylindrical shell. The equilibrium equations and the strain-displacement relations are derived from the Reissner-Naghdi theory in elastic shells with given consideration to the effect to shear deformation. It is assumed that the total strain rates are composed of an elastic part and a part due to creep. The elastic strains are proportional to the stresses by Hooke's law. For the constitutive equations in the creep range, McVetty's equation is employed. As a numerical example, the creep of a two-layered cylindrical shell composed of mild steel and stainless steel subjected to locally distributed loads is analyzed. Numerical computations have been carried out for three cases of the ratio of the thickness of the stainless steel layer to the shell thickness. It is found from the computations that the stress distributions and the deformation are significantly varied depending on the ratio.View full abstractDownload PDF (870K) -
Katsuhiko MURASE, Tohru NISHIMURA1987 Volume 53 Issue 485 Pages 106-110
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn this paper, the authors describe a method that identifies four bending stifnesses of an orthotropic plate. A circular plate is used to carry out the static test of three points bending. Its deformation is measured in several cases of supporting and loading conditions. Then, from the measured values and some initial set ones, four bending stiffnesses are determined by the least square method using a personal computer.View full abstractDownload PDF (596K) -
Yuzuru EGUCHI, Laszlo FUCHS, Genki YAGAWA1987 Volume 53 Issue 485 Pages 111-115
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe present paper describes the application of the Conjugate Residual (CR) method to the solution of the time-dependent incompressible Navier-Stokes (N-S) equations. The N-S equations are integrated in time via the semi-implicit method and the fully coupled indefinite system of the N-S and incompressibility equations is solved by the CR method simultaneously. This computational code has been applied to the unsteady flow analysis in a bifurcated pipe.View full abstractDownload PDF (694K) -
Masaru SAKATA, Shigeru AOKI, Kikuo KISHIMOTO, Tsutomu YOSHIDA, Hiroshi ...1987 Volume 53 Issue 485 Pages 116-121
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSFracture toughness tests on three-point and four-point mixed mode ( Mode I + Mode II ) bend specimens of an aluminum alloy A5083-0 have been conducted. The fractured surface and the cross section of the crack tip have been observed by a scanning electron microscope. For the four-point bend specimen, one corner of the crack tip was blunted and the other sharpened. the critical stretched zone width (SZWc) is different at the two corners, but the critical stretched zone length along the deformed tip (SZLc) has almost the same value for both Mode I and mixed mode conditions tested. The parameter SZL may be a useful elastic-plastic fracture parameter. A finite element analysis has been conducted to obtain the relationship between the J-integral and SZL, and the critical value of the J-integral under the mixed mode condition is discussed.View full abstractDownload PDF (968K) -
Yuzuru SAKAI, Masanori MUKAIHATA, Eisuke FUJII1987 Volume 53 Issue 485 Pages 122-127
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSRapid-load plane-strain fracture toughness was evaluated on type A508 class 3 steel using a high loading rate tensile machine. Tests were performed according to ASTM E399-83 ANNEX 7 in order to examine the effects of specimen thickness on initiation toughness KQ and to clarify the significance of the fracture time limitation. The results of this study show that the variation in measured KQ values could be reduced by increasing the specimen thickness and the present size requirements of B ≥2, 5(KQ/σyD)2 are marginally sufficient to obtain valid plane-strain fracture toughness KIC(t) values, and that the fracture time limitation of ANNEX 7 is not substantial requirement but dependent largely on the accuracy of instrumentation of the testing system.View full abstractDownload PDF (791K) -
Kazuo ARAKAWA, Kiyoshi TAKAHASHI1987 Volume 53 Issue 485 Pages 128-134
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSEffects of the crack velocity a^^· and the crack acceleration a^^&lo;··&gut; on the dynamic stress intensity factor Kd of Humility-100 were studied. Evaluations of Kd, a^^· and a^^&lo;··&gut; during dynamic crack propagation were made by using the method of caustics in combination with high-speed photography. The relation between Kd and a^^·, i. e. Kd(a^^·), showed that it is not a unique function of a^^· and that the decelerating cracks have larger values of Kd(a^^·) than the accelerating cracks for the same velocities. It is found that Kd(a^^·) for a constant acceleration, i. e. Kd(a^^·, a^^&lo;··&gut;=cost), becomes a unique function with respect to a^^·.View full abstractDownload PDF (887K) -
Sei UEDA1987 Volume 53 Issue 485 Pages 135-138
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe impact responses of rectangular and penny-shaped crack are considered in this study. Laplace-Fourier and Laplace-Hankel transforms are used to reduce the mixed boundary problems to dual integral equations. The solutions are expressed in terms of Fredholm integral equations of the second kind having a kernel with fast rate convergence. The numerical inversion of Laplace transform by the use of the FFT algorithm contributes to the improvement of the accuracy of the result and the reduction of CPU time.View full abstractDownload PDF (476K) -
Osamu WATANABE1987 Volume 53 Issue 485 Pages 139-147
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe present paper proposes a new law of anisotropic hardening of plasticity, using an internal time concept developed by the endochronic theory. This report describes a fundamental aspect of the present law as well as comparison with the previous experiments under tension-torsion conditions. The present law can accurately predict shape change of yield surface with only two parameters of deformations, and also express vertex effects of yield surface as a special case of the present theory.View full abstractDownload PDF (872K) -
Takashi ICHIYANAGI, Hiroyuki NAKA, Kazuei KENMOCHI1987 Volume 53 Issue 485 Pages 148-152
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn plastic goods which have rib/boss structures, partial deformation by thermal shrinkage called "Sink Mark", is formed. In this study, to make clear the characteristics of sink mark growth, an experimental approach was taken. By using a T-shaped experimental mold cavity, the amounts of sink mark were compared with each shape parameter and processing parameter. As a result, the pressure on the packing stage and the rib thickness are the most effective to the sink mark growth. When the pressure of the packing stage is small enough (less than 10 MPa), the profile on the upper plate becomes anti-symmetric because of the pressure distribution of the filling stage.View full abstractDownload PDF (622K) -
Hiroyuki NAKA, Takashi ICHIYANAGI, Kazuei KENMOCHI1987 Volume 53 Issue 485 Pages 153-158
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSAn analytical method for evaluating the sink mark in rib structures is proposed. In the analysis model, when the shape of the cross section does not change in the longitudinal direction, 2-dimensional time-transient thermal analysis by FDM is used. At the same time, by assuming the fiber elements, and by treating the model as a thermal-elast-plastic strain problem, the growth of the sink mark in the die is theoretically evaluated. In consideration of the P-V-T characteristics of the resin, the analytical results are correlate well with the experimental data.View full abstractDownload PDF (721K) -
Nozomu KAWAI, Toshihiko MORI, Nobukazu HAYASHI, Yoshinori MURATA1987 Volume 53 Issue 485 Pages 159-165
Published: January 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn the previous paper, it has been clarified that the r-value of mild steel sheets changes during a deep-drawing process, and the change influences markedly the deep-drawability. This paper deals with the strain path dependence of the work hardening characteristics of the mild steel sheets. The stress σ-strain ε relations are described under three linear strain paths, that is, uni-axial tension, plane strain tension, and equi-biaxial tension. The results are as follows : (1) under the uni-axial and plane strain tension, the rates of the work hardening d log σ/d log ε hardly change, or increase somewhat by increasing the strains ; that is, ten n power low σ=Fεn or the initial strain type σ=F(ε+ε0)n holds. (2) Under the equi-biaxial tension, the same relations as in (1) hold in the small strain range (ε⥶0.2), but by increasing the strain (ε≥0.2∼0.3), the rate of work hardening increases linearly ; that is, σ=Feaεεb holds there. The limit strains calculated by using the above relations show good agreement with experimental values.View full abstractDownload PDF (841K)
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