Transactions of the Japan Society of Mechanical Engineers
Online ISSN : 2185-9485
Print ISSN : 0029-0270
ISSN-L : 0029-0270
Volume 22, Issue 119
Displaying 1-16 of 16 articles from this issue
  • Yasutake ICHIKI
    1956 Volume 22 Issue 119 Pages 451-452
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
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  • Heihachi SHIMADA
    1956 Volume 22 Issue 119 Pages 453-456
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    The stresses of the cantilever with a semi-circular notch have been investigated photoelastically. In the experiments, the test pieces are made of KT-102 (epoxy resin), having 4 types of semi-circular notch. Consequently, under the condition of cantilever, the maximum stress developed at the boundary of the notch is a function of the 3 parameters, namely, the radius of the semi-circular notch, the distance of the loading point from the clamped end, and the distance of clamped end to center of the semi-circular notch. The stress concentration of pure bending is applied to the cantilever, having same notch, in some range.
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  • Tsuneyo ANDO
    1956 Volume 22 Issue 119 Pages 457-461
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    As the most fundamental problem in bending of circular plates of variable thickness, here is given a stress analysis of plates, in which thickness is decreased with the increase of distance from the centre, loaded with some hydrostatic pressure. Assuming thin plates and load independent of azimuthal location, the problem is reduced to be one dimentional. Here thickness variation is given in the form of h=hmax(1-ρμ)m/s, which is an equivalent expression to the variation of flexural rigidity D=Dmax(1-ρμ)m. General solutions for such cases are shown, and numerical results are given of some examples when plates are clamped at inner radius, free at outer, and bent by hydrostatic pressure. Result for a plate with constant thickness and bent under the corresponding condition is also calculated, and compared with those in case of variable thickness.
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  • Yoitiro TAKEUTI
    1956 Volume 22 Issue 119 Pages 462-468
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    In a previous paper we considered the two-dimensional stress problems solved only by harmonic function. Applying same method, in this paper, some very simple formulas are obtained for the problems of infinite plate with a hole under uniform tension or shear. Thus, we can mechanically calculate the edge-stress, provided only the sorts of curvilinear coordinate are given. Numerical results are given for the stress concentration problem of the plate containing a hole represented by the function z=cosh ζ1/2.
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  • Rokuro MUKI
    1956 Volume 22 Issue 119 Pages 468-474
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    The previous solutions for the stress distribution in a semi-infinite elastic solid under the action of a tangential load over it seem extremely unsuited for applying to special problems. In this paper, the general solution, which is free from the objections raised above, is obtained by the method of Hankel transforms. The general solution is then applied to some particular problems, and numerical calculations are carried out.
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  • Eiryo SHIRATORI, Shigeo SASAKI
    1956 Volume 22 Issue 119 Pages 475-479
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    A method of determining stresses and strains in a fully plastic rotating disc with a uniform thickness and a centre hole is developed by means of the deformation theory. Comparisons between calculated values and experimental data of the strain-distributions are made for aluminium and brass discs. The results of comparisons show that the calculated values of radial deformations are, in some degrees, less than the observed values. This discrepancy is considered mainly due to the impropriety of the assumption that the material is homogeneous and isotropic after it submitted plastic deformation.
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  • Hiroshi NAKAMURA, Shiro UEDA, Hideo TAKAHASHI
    1956 Volume 22 Issue 119 Pages 479-483
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    Previously the authors pointed out that the endurance limit under rotating bending of a solid circular specimen of plain carbon steel, especially the one with circular groove was enormously improved by "Induction Hardening". Since then "Induction Hardening" has been applied to miscellaneous machine parts, particularly force-fitted or notched parts under such condition. This method was also expected to be useful for the helical springs made of medium-carbon steel. This time they investigated torsional fatigue limit of induction-hardened medium-carbon steel (C=0.41% steel) by a 200kg-m Schenck type fatigue testing machine, with the intention of applying it to helical springs. From the results, it could be confirmed that there was a possibility of manufacturing induction-hardened helical springs.
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  • Hajime NAKAZAWA
    1956 Volume 22 Issue 119 Pages 484-488
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    The object of this paper is to find the various errors accompanying the solution of problems of torsion by means of an analogycal method with an electrolytic tank. By the author's experiments, when he can choose a suitable scale for the model and pay attention in selecting the materials of electrods, probe, electrolyte and the apparatus, etc., he can obtain the stresses with errors less than 2% and the torque, with errors less than 1%. By this method, the author treated a shaft with hair cracks and another one with key ways, etc., and the results are shown in this paper.
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  • Sumiji FUJII, Heki SHIBATA, Tatsuya SHIGETA
    1956 Volume 22 Issue 119 Pages 489-491
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    By a series of experiments on a model of an automobile propeller shaft, considerably strong whirling phenomena are found at 1/2, 1/4, 1/6, 1/8, …… of the ordinary critical speed. Calculations also show that the friction at the universal joints gives exciting forces of frequencies 2, 4, 6, 8, …… times as large as the rotating speed of the shaft, and therefore, it can be the cause of such vibrations.
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  • Sumiji FUJII
    1956 Volume 22 Issue 119 Pages 492-496
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    In some tests of automobiles it is found that some cars show stronger understeering tendency than expected from their tyre characteritics. The main cause of this effect is considered to be the flexibility of their steering systems. According to the analysis in this paper the apparent cornering power of a front wheel is expressed as EKf, where Kf is the actual cornering power of the wheel and E is a constant which is positive and smaller than the unity. This E depends on the conering power, self-aligning moment, caster angle and the flexibility of the steering system, being E=1 for a rigid steering system. Thus, the apparent cornering power of the front wheels decreases, if the steering system is flexible, and this apparent decrease in the cornering power increases the understeering tendency and the directional stability of the car.
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  • Toshio NISHIHARA, Hisayoshi SEKIGUCHI, Ryoichi KOTERAZAWA
    1956 Volume 22 Issue 119 Pages 496-501
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    Whether the temperature has an influence on the amplitude dependence of the rubber vibration isolator is a problem of interst. It was studied using a vibration isolator made of a sort of rubber containing carbonblack at a proportion of 40 parts per 100 of natural rubber under the condition of temperature range of 0°C∼75°C and amplitude range of 0.3∼3% at constant frequency of 1000 c.p.m. As a result, it was found that the dependence of dynamical modulus and dynamical internal friction on amplitude is not affected by the change of temperature, and this can be explained by introducing the idea of static hysteresis as independent of temperature. The following three items are also discussed, 1. The relation between the results of vibration tests and the creep test, 2. The temperature dependence of vibration characteristics of the above material, 3. The amplitude dependence of vibration characteristics of Neoplene and of Hyear-OR-25.
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  • Atsushi KIUCHI
    1956 Volume 22 Issue 119 Pages 502-506
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
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    This paper deals with problems of a vibration characteristics of a ellastically supported mechanical system with a shaft which is elastically connected with the outer body.
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  • Masuo ANDO
    1956 Volume 22 Issue 119 Pages 506-511
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    The experiments were made with different coupling angles of crank and propeller blade in the two-cycle four-cylinder 800 B. IP-195 rpm marine Diesel engine directly coupled to a four-bladed propeller through a short intermediate shaft in single screw ship. The results showed that the amplitude was reduced to about half the worst coupling angle upon verious speeds, they gave the best coupling angle.
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  • Kokichi ITO
    1956 Volume 22 Issue 119 Pages 512-516
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
    It is generally believed that the domestic-made machines are inferior in durability to the imported ones. The only factor for it is the inferior abrasion quality itself. Measurement process of strength and hardness is simple, but measurement of abrasion is more difficult, and moreover there being no standard for abrasion measurement, their comparative discussion is infeasible and the measured results are also unreliable. We have more than 10 varieties of abrasion testing machines, but owing to the lack of the measuring standard, we find no abrasion meter. Measuring condition under the least error will be summarized that to find special values for p (kg/cm2) and v (rpm), which satisfy the following three conditions simultaneously, i.e., dL/dN=K, ∂L/∂p=0 and ∂L/∂v=0, where N denotes number of revolutions (=abrased distance). Prof. Okoshi found that the abrasion loss L=f (pv), and the error being expressed by dL, the solution can be found from next formula [numerical formula] After tedious experiments, the author has found p=25 kg/cm2, v=500 rpm, which satisfy formula (1). Next, it has been realized that these conditions hold for all the test pieces having extremely different qualities. Basing on the above results, the auther has invented an "Abrasion Meter", to which the Japanese Patent No. 198863 was granted in March 1953.
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  • Atsushi SAITO
    1956 Volume 22 Issue 119 Pages 516-518
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
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  • Atsushi SAITO, Osamu KAWAKAMI, Jinnosuke SAITO
    1956 Volume 22 Issue 119 Pages 519-521
    Published: July 25, 1956
    Released on J-STAGE: March 28, 2008
    JOURNAL FREE ACCESS
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