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Juhachi ODA
1984 Volume 50 Issue 452 Pages
543-550
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Shigemi SASAKI, Yasuo OCHI, Shin-ichi TSUJIMOTO
1984 Volume 50 Issue 452 Pages
551-559
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Hideaki NAKAYAMA, Yukio KANAYAMA, Masahiro SHIKIDA, Tsuneshichi TANAKA
1984 Volume 50 Issue 452 Pages
560-566
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Mitsuyuki KOBAYASHI, Ohmi MIYAGAWA, Jinichiroh TAKAHASHI
1984 Volume 50 Issue 452 Pages
567-575
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Minoru YAMADA, Sitiro MINAGAWA
1984 Volume 50 Issue 452 Pages
576-583
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Minoru HAMADA, Yoji SHIBUTANI
1984 Volume 50 Issue 452 Pages
584-592
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Tadashi SHIOYA, Takehiko TOH
1984 Volume 50 Issue 452 Pages
593-599
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Toshiyuki SAWA, Hiroyuki KUMANO
1984 Volume 50 Issue 452 Pages
600-609
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Kazuo TAKAKUDA, Kenji AOYAGI, Toshikazu SHIBUYA, Takashi KOIZUMI
1984 Volume 50 Issue 452 Pages
610-617
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Naotake NODA
1984 Volume 50 Issue 452 Pages
618-625
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Takahito GOSHIMA, Kaju MIYAO
1984 Volume 50 Issue 452 Pages
626-635
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Takahito GOSHIMA, Kaju MIYAO
1984 Volume 50 Issue 452 Pages
636-644
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Hiroyuki KAGAWA, Yasuhide ASADA, Shunsaku MITSUHASHI
1984 Volume 50 Issue 452 Pages
645-653
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Toshimitsu YOKOBORI, Takeo YOKOBORI, Hiroshi SAKATA
1984 Volume 50 Issue 452 Pages
654-660
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Tsuneaki SAKAKI
1984 Volume 50 Issue 452 Pages
661-668
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Yoshinobu MOTOHASHI, Takao SHIBATA
1984 Volume 50 Issue 452 Pages
669-678
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Yasuyuki SEGUCHI, Yukio TADA, kazuyuki KEMA
1984 Volume 50 Issue 452 Pages
679-686
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Yoshihiko SUGIYAMA
1984 Volume 50 Issue 452 Pages
687-692
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Stability of a cantilevered system of articulated pipes conveying fluid is studied theoretically and experimentally by considering models having two degrees of freedom. The system is nonconservative and becomes subject to flutter-type instability or divergence-type instability depending on the parameters of the system. Firstly the effect of an intermediate lateral spring support on the stability is investigated to show that an additional spring support at the tip end can destabilize the system. Secondly the combined effect of a spring support and a lumped mass is discussed to show that the stability analysis by neglecting internal damping may result in an erroneous flutter prediction, especially when a big lumped mass is attached at the free end of the nonconservative system. Finally a set of experiments was conducted to verify the theory. Agreement between theory and experiment was satisfactorily good.
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Kazumasa MORIYA
1984 Volume 50 Issue 452 Pages
693
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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A special element that simulates elastic behavior near an elliptic hole has been developed for the finite element analysis of local stress concentrations arising from elliptic holes, notches, fillets and cracks. The formulation is based on Laurent series expansion technique and hybrid finite element model. The present element serves as a bending element as well as an in-plane one without modifying computer program. It is an efficient mesh reducer and it gives accurate stress distribution in the near field region. Then one axis of elliptic hole is set to be zero, the element becomes a crack element with embedded stress singularity and the stress intensity factors K
I, K
II or K
B, K
S are directly obtained as the sum of the internal parameters. Numerical example includes in-plane stretching and out-of-plane bending of plates with variety of holes, notches and cracks.
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Shinsuke SAKAI
1984 Volume 50 Issue 452 Pages
700-708
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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The crossed isochromatics method is proposed to measure the isoclinics more accurately than before. By the method after isochromatics are measure, isoclinics can be measured easily without changing the specimen and its load. The principle of the method and a few examples are shown. The isoclinics are compared with the theoretical lines and satisfactory results are obtained. The method is compared with the method by the usual crossed plane polariscope. It is shown that the isoclinics can be measured in narrower width by the crossed isochromatics method than by the former method. The characteristics of the method are considered and this method is shown to be effective in higher stress region and singular points. Finally the limit of the application of this method are considered.
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Taro NAGAHIRO, Kensuke NONO
1984 Volume 50 Issue 452 Pages
709-716
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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This paper is concerned with two dimensional stress analysis (lengthwise and widthwise) of single lap joints in consideration of adherends bending. Partial differential equations of stresses in adhesive layer are found and on the assumption that solutions of these partial differential equations are obtained in the form of separable solutions of variables, shear and normal stress distributions are analyzed.
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Isamu YOSHIMOTO, Kazuo MARUYAMA, Yoshikazu YAMADA
1984 Volume 50 Issue 452 Pages
717-721
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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This paper treats the fatigue strength of bolt-nut joints in which the bolt threads are produced by the two methods, namely (1) rolling before heat treatment and (2) rolling after heat treatment. The size and mechanical property class of bolts are M10 or M10×1.25 and 12.9 or 8.8 respectivery, and the heat treatment means quenching and tempering. The residual stresses at the roots of bolt threads are measured by Heyn's method. The bolts produced by method (1) have small residual stresses, and the bolts produced by method (2) have the compressive residual stresses 690 MPa at maximum. The fatigue tests of the above mentioned bolt-nut joints are done under the two conditions σ
min/σ
max=0.1 and σ
mean=0.6×(yield stress of bolts). The obtained experimental results show a fairly good agreement with the predicted values based on the measured residual stresses and Yoshimoto's hypothesis concerning the fatigue strength bolt-nut joints.
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Kiyotsugu OHJI, Shiro KUBO, Takao INUKAI, Yuzo IMOTO, Akio MATSUMOTO
1984 Volume 50 Issue 452 Pages
722-728
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Creep crack growth experiments on Type 304 stainless steel and Cr-Mo-V steel were conducted with special emphasis on the detail observation of the crack growth and deformation behavior during deformation rate and the modified J-integral. J' were very high as compared with whose under steady-state creep conditions and decreased sharply with time, and that localized slops at grain boundaries in from of a crack tip developed. The crack growth rate was relatively low in this stage. In the latter half stage crack growth was controlled mainly by the coalescence of micro-cracks initiated at grain boundaries with a main crack and the crack growth rate was approximately given as a sole function of J'. These phenomena were interpreted by considering the effect of small-scale creep as well as that of damage accumulation.
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Hiromasa ISHIKAWA
1984 Volume 50 Issue 452 Pages
729-736
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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The stress analysis of structures subjected to cyclic loading requires constitutive relations sufficiently simple to be usable with computer program and yet adequate to describe the essential features of the plastic behavior of the material. In this paper, a generalization of current theories of cyclcic plasticity id developed. Namely, the plastic flow rule for work hardening or softening materials under cyclic loading is proposed, and then applicability of Ramgberg-Osgood's low to cyclic loading is presented. The movements of the loading surface are restricted herein by modified Prager's low, and its expansion and contraction are represented by the cummulated plastic work as a parameter of loading surface. This model is shown to provide a quantitative representation of the transient uniaxial cyclic hardening process for type 304 austenitic stainless steel.
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Kenji HATANAKA, Tatsuro FUJIMITSU, Hideaki WATANABE
1984 Volume 50 Issue 452 Pages
737-743
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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The growth behaviors of small surface cracks, of which growth process occupied the great part of the fatigue life, were experimentally examined in low carbon steel under rotating bending fatigue. The growth rate of these cracks, furthermore, were analyzed in terms of J integral range, ΔJ evaluated in elastic-plastic manner by assuming that the crack tip was open even under the compressive stresses during fatigue. The growth rate was represented by a linear band with the smaller amount of a scatter against ΔJ than against the stress intensity factor range, ΔK in the log-log plot. The linearity was also held good up to the region of the lower growth rate against the former than against the latter. The equation of ΔJ=ΔKσ
2/E, in which Δσis substituted by E·Δε, where Δσ, Δεand E and stress range, strain range and Young's modulus, respectively, could also be a good parameter equivalent to the above ΔJ for the evaluation of the crack growth rate.
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Masafumi SENOO, Ikuya FUJISHIRO, Motohisa HIRANO
1984 Volume 50 Issue 452 Pages
744-750
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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To discuss the elastic properties of aluminum, the variations of the crystal energy at 0 K with the (1 0 0) lattice deformations are evaluated by means of the pseudopotential methods, using the model potential proposed by the authors previously. A distinction is made between the mechanical behaviour of a face centered cubic (fcc) lattice in (1 0 0) loading (i.e. transverse stresses are zero) and in (1 0 0) deformation (i.e. transverse strains are zero). The fcc-bcc transitions and the elastic instabilities associated with the deformations are briefly discussed. Some elastic constants of aluminum at 0 K have been calculated. The stress-starin relations in so large elastic strains up to the theoretical tensile strength are presented.
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Akikazu NAKAGIRI, Haruoki MAEDA, Minoru KITA
1984 Volume 50 Issue 452 Pages
751-757
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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The relief of surface residual stress in a FC25 Pearlitic Graphite Cast Iron plate has been experimentally studied using a large laboratory shaker. When the vibratory stress amplitude added to the residual stress is more than 0.02% offset stress in the materials, more residual stress is relieved. When the value is smaller than the added value, residual stress is not relieved. Unequally distributed residual stress throughout the specimen can be relieved through vibration. This is accomplished by changing the point at which the materials are held in the vibration equipment. By determining the number of vibration cycles and the stress amplitude, fatigue damage on the materials can be prevented under certain condition. After exposing the materials to vibratory stress, remarkable change in residual stress was not observed after exposure in open air for one month.
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Kazuo HAYASHI
1984 Volume 50 Issue 452 Pages
758-763
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Basic boundary integral equations are presented for an elastic body with cracks, where the existance of boundaries other than the crack surfaces are taken into account. The unknown functions of the integral equations are displacement-discontinuities on the crack surfaces and displacements or surface tractions on the boundaries other than the crack surfaces. Four crack problems are analyzed: i.e., problems for an annular crack, a flat elliptical crack, a curved circular crack and a flat square crack near a traction free surface, and it is shown that the method presented here are flexible for various kinds o crack problems.
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Yukio SUGAWARA, Hiromasa ISHIKAWA, Kin-ichi HATA
1984 Volume 50 Issue 452 Pages
764-770
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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A thermoelastoplastic creep stresses of steel bar during tempering, which was hardened by high frequency induction hardening, are analyzed. The relation between the surface temperature and the tempering time of the bar measured by experiment is used in the numerical calculations. A quasistatic, uncoupled thermoelastoplastic creep analysis based on the incremental theory of plasticity and on the Mises-Mises creep theory for a method of successive elastic solutions is carried out. The material properties of the bar is assumed to be temperature dependent, m and to be characterized by Norton's Low for secondary creep.
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Koichi EGAWA
1984 Volume 50 Issue 452 Pages
771-777
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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A high temperature strain gage which can be adhered in reverse is developed for attaining accurate strain measurement of acoustically excited structures at elevated temperatures. The reversible gage is a self-temperature compensated, polyimide base, foil one usable upto 250°C. The given environment is so hostile that main effort is devoted to limite the error of the measurement under 50×10
-6 upto 250°C. Then, the creep and drift of the reversible gages are tested for applying them to aircraft flop model tests. The fatigue of reversible gages are checked after the test by measureing their resistances, gage-factors and dynamic responces. Consequently, it is clarified that the reversible strain gage is a good tool to obtain accurate high temperature strain data, and it is thought to keep its performances under the hostile environment without considerable deterioration.
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Shuichi FUKUDA
1984 Volume 50 Issue 452 Pages
778-783
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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The use of a computer in securing structural integrity is not straightforward, because quite many and diversified knowledge is required and knowledge integrity is not always assured. This paper attempts a knowledge engineering approach to the problem of securing structural integrity and the methodology and the software system using the programming language LISP have been developed. A pressure vessel case study shows that this software system is quite flexible and capable of manipulating many diversified knowledge and that LISP provides a realistic and quite useful tool for the present purpose.
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Kenji KANEKO
1984 Volume 50 Issue 452 Pages
784-790
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Practical new plastic constitutive model is presented on the basis of many experimental facts for initially anisotropic metal after various prestrainings. This model consists of two surfaces which bound of an elastic region, a transitional hardening region and a steady hardening region with respect to elasto-plastic behavior in the five dimensional deviatoric stress space. The surface F which represents the elastic region moves rigidly according to the newly presented rule. The surface G which distinguishes the transitional hardening region from the steady one moves to the direction of the stress vector and transforms its shape. The associated flow rules are adopted with the two surfaces in determining a corresponding plastic strain increment to a stress increment. The modified hardening coefficients are used when the loading point moves in the transitional hardening region. Applications of this constitutive model to some concrete examples will be presented in some following reports.
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Kazumi HIRANO, Satoyuki ISHIZAKI, Hideo KOBAYASHI, Hajime NAKAZAWA
1984 Volume 50 Issue 452 Pages
791-798
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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The Top-on ultrasonic method proposed earlier is applied to rising load K
ISCC testing, and it is shown that the initiation behavior of stress corrosion cracking under monotonic loading can be accurately detected from an echo difference output voltage characteristics. Threshold stress intensity factor level below which no stress corrosion cracking will occur are evaluated both under charging hydrogen and in 3.5% by weight NaCl solution, and the validity of rising load K
ISCC testing based on the ultrasonic method is confirmed by comparing these K
ISCC values with that determined according to long time K
ISCC testing in the same environments. Moreover, the influences of loading rate, fatigue precracking level and fracture mechanism of precracked zone on K
ISCC are discussed.
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Kazuo TAKAKUDA, Yasushi TAKIZAWA, Takashi KOIZUMI, Toshikazu SHIBUYA
1984 Volume 50 Issue 452 Pages
799-804
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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The transient dynamic boundary value problems of elastic bodies with cracks are formulated in the forms of the integral equations. In particular, the equations for anti-plane problems are worked out in detail. Several numerical calculations are carried out and the variations of the stress intensity factors with time are clarified, for the case of the SH step-stress waves being incident on one or two Griffith cracks in an infinite body.
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Toshikazu SHIBUYA, Takashi KOIZUMI
1984 Volume 50 Issue 452 Pages
805-812
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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A contact problem of an elastic half space adhered by a rigid punch under tension is considered on the basis of the three-dimensional theory of elasticity. The behaviour of the adhesion is approximated by a combination of tension and shear springs. The normal and shearing stresses on the adhesive plane of the half space are expressed by Jacobian polynomials. This mixed boundary value problem is reduced to solve two infinite systems of simultaneous equations. The distributions of stresses and displacements on the surface of the half space are illustrated in various cases of the adhesion. The affection of the adhesion on these results is investigated in detail.
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Masaichiro SEIKA, Seiichiro KITAOKA
1984 Volume 50 Issue 452 Pages
813-819
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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The copper foil tested is made by tearing off electrodeposited copper on the surface of a stainless steel plate. The foil is about 12μm in thickness. Foil gauges are made by splitting the foil into many pieces with a rectangular form of 2mm×30mm and they are attached to the tapered rods of carbon steel which are used as the calibration test specimens subjected to cyclic torsion. When the foil is prestrained, preheated, and held at room temperature for a long time, the effects on the calibration values of the foil gauges are inspected in detail. Based on the above results, the methods of improving the sensitivity of the foil gauges are discussed.
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Hideo KOBAYASHI, Yoshio KITSUNAI, Yukio INO, Asao NARUMOTO, Tadao IWAD ...
1984 Volume 50 Issue 452 Pages
820-828
Published: April 25, 1984
Released on J-STAGE: February 21, 2008
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Characteristics in fatigue crack growth under spectrum loading with p-distribution for an A 508-3 steel were investigated. Based on the results, the influence of the p-distribution, the load sequence and the stress ratio on crack growth rates was discussed. In the case that the stress ratio is about zero, the linear prediction law of crack growth is found to give and excessively conservative estimation of crack growth rates above 5×10
-9m/cycle. The modified linear prediction law gives and unconservative estimation of near threshold crack growth rates in the case that p is large. Under positive man load, however, the retardation effect becomes smaller and the linear prediction law can give a good estimation of crack growth rates.
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