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29 巻, 203 号
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飯塚 幸三, 元田 一也1963 年 29 巻 203 号 p. 1113-1121
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーShore hardness testers are calibrated against five standard blocks of different hardness, the value of which is determined by converting their Vickers hardness into Shore hardness in accordance with a prescribed formula. The accuracy of the Shore hardness scale thus determined is investigated in two ways. Firstly, the consistency of the relation between Vickers and Shore hardness in commercial standard hardness blocks is investigated by making a factorial experiment and is found to be within ±0.6∼1.0 Hs, including the error of Vickers hardness tests. Secondly, the discrepancy of the scales of different Shore hardness testers at hardness values other than those calibrated with a tolerance of ±1.0 Hs is examined and is proved to be less than ±1.8 Hs.抄録全体を表示PDF形式でダウンロード (1486K) -
辻 一郎, 島田 平八1963 年 29 巻 203 号 p. 1122-1126
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーThe stresses in cemented joints, specially lap joints, were studied photoelastically. The photoelastic models were made of epoxy resin and epoxy rubber or epoxy resin and metal, namely, each material has respective elastic constant. The shapes of the joints adhesives are a rectangular type, with a filet, with a convex or concave semi-circular ends. From the results of experiments, the filets are more effective for reducing the high stresses in lap joints. The other result has revealed that the joint with a concave semi-circular ends is best, that with a rectangular ends is second best and that with a convex semi-circular ends is worst of all so far as the stresses in lap joints are concerned.抄録全体を表示PDF形式でダウンロード (978K) -
島田 平八, 辻 一郎1963 年 29 巻 203 号 p. 1127-1130
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーStresses due to tention of I-beam with a circular hole at the web were studied photoelastically. Test pieces were made of KT-102 with adhesive method. The stress concentration was reduced at the hole boundary at the minimum section and the values of stress concentration of the I-beam were calculated by the values of the stress concentration with a circular hole of a beam having the equal cross sectional area without flange.抄録全体を表示PDF形式でダウンロード (828K) -
守 恭平1963 年 29 巻 203 号 p. 1131-1136
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーWhen there is a crack on the straight edge of a plate subject to tension, to prevent further development of the crack, a circular hole is drilled at the end of the crack. Considering the above case, the author has solved the problem of a semi-infinite plate with a circular hole connected to the straight edge by a straight and narrow slit undergoing uniform tension parallel to the straight edge. He has obtained stress distributions on the plate and the factors of stress concentration at the bottom of the circular hole.抄録全体を表示PDF形式でダウンロード (524K) -
坂田 勝1963 年 29 巻 203 号 p. 1137-1144
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーMany papers on the creep analysis of rotating disks have been published, and most of them are applied to the disks under special conditions of constant thickness and constant temperature. Experimental papers are quite small in number. The analytical and experimental studies are described in this paper. By the analytical method the steady-state creep deformations and stresses in the disks with variable thickness and variable temperature are calculated with easy numerical computations. Creep tests of rotating solid disks of forged 18-8 Mo stainless steel were carried out by means of the hot-spin tester prepared by the author and his collaborators. At the same time, specimens were cut out from the various parts of the disks and put to creep tests and other material tests. The analytical results were compared with experimental ones. Mises criterion has given the better agreement with the test data.抄録全体を表示PDF形式でダウンロード (937K) -
河本 実, 柴田 俊忍, 和田 孝直1963 年 29 巻 203 号 p. 1145-1153
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーIn this paper, the change of plastic strain amplitudes under the tension-compression double stress and the growth of the fatigue cracks under plain bending double stress were investigated on three carbon steels. In these tests the phenomena of plastic strain amplitude and growth of fatigue cracks under the secondary stress are entirely different from those under the primary stress only, i.e., the material which subjected to the primary stress has the different features from the virgin material. And it is thought that the advantage of fatigue under the secondary stress differs from that under the mono repeated stress. The effect of primary stress on the phenomena of material under the secondary stress does not die away till the specimen fractures.抄録全体を表示PDF形式でダウンロード (947K) -
西岡 邦夫, 小松 英雄1963 年 29 巻 203 号 p. 1154-1160
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーCanti-lever type fatigue tests were carried out for various cases of press-fitting of collar with 50 mm-dia. specimens. Thicknesses of collars were of two kinds-3 and 12.5 mm, the material of shaft being of practical axle (SF55, normalized). Results obtained were as follows : (1) Hardness of collar was taken as Hv=140 and 600, but the effect was very little.(2) The fatigue limit where the collar was press-fitted over the fillet portion of shouldered shaft was lower than in the case of only press-fitting. Lowest fatigue limit was obtained for the specimen of which the collar was press-fitted closely to the shoulder portion with the fillet radius of zero, and the magnitude was not affected by the press-fitting of collar. (3) The fatigue limit was lowered even by light press-fitting, and very little effect of radial pressure at the press-fitted surface was recognized.抄録全体を表示PDF形式でダウンロード (804K) -
西岡 邦夫, 久光 脩文1963 年 29 巻 203 号 p. 1161-1170
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーBy using the two-dimensional photoelastic method, the authors have investigated the various factors affecting the scf. at the reentrant corner of triangular rib, when the rigidities of intersecting members were different and subjected to pure bending. The results obtained were as follows : 1. The stress concentration factor (scf.) was not affected by the rigidity of the opposite member unless the rib was very small. 2. The scf. decreased as the fillet radius and dimension of rib increased. On the other hand, the scf. increased as the angle of rib and thickness of member increased. 3. For reinforcing the intersecting members with different rigidities, the dimensions of triangular rib should be so chosen as the longer side is attached to the member of higher rigidity and the shorter one to that of lower rigidity, because the maximum stresses at the reentrant corners could be thus equalized. And the most appropriate ratio of the shorter side to longer one decreased with increasing ratio of rigidity of intersecting members, dimension of rib and fillet radius.抄録全体を表示PDF形式でダウンロード (1029K) -
武田 信男1963 年 29 巻 203 号 p. 1171-1180
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーIn the 4th report, the mechanism of inner diameter deformation caused by induction heating was studied, but heating is immediately followed by quenching in actual induction hardening. The deformation in such case has been considered in the present paper. The temperature distribution has been solved graphically, and the thermal stress as well as inner diameter deformation have been calculated for several induction hardening conditions. From these results, the explanations are given for the mechanisms of the deformation presented in 1st and 2nd reports experimentally. Further, the stress and the deformation due to martensite formation are also considered. Thus, the mechanisms of the deformation have been made clear and it became possible to select the induction hardening condition that causes less distortion.抄録全体を表示PDF形式でダウンロード (877K) -
平 修二, 本田 和男, 山内 康平1963 年 29 巻 203 号 p. 1181-1188
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーIn the previous papers, the authors reported that the half-value breadths of metals read from X-ray diffraction lines changed with application of alternating stresses at a constant or varying stress amplitude. It was found that the b/B -log n/N (n/N is a cycle ratio) or the b/B - log Σ n/N (Σ n/N is the summation of cycle ratios under a varying stress amplitude) relations were expressed by straight line, and offered a certain method of nondestructive prediction of fatigue life. On the other hand, in order to interpret the change in half-value breadth due to stress repetitions, we investigated the appearance of slip-bands that developed on the surface of the annealed carbon steel, and also observed the change in macro-residual stress in fatigue processes. In the present investigation, we investigated the relation between change in half-value breadth and macro-residual stress, micro-structure, micro-hardness of cold worked carbon steel and age hardenable Al-Cu alloy, and discussed on the change in half-value breadth from the standpoint of the fatigue mechanism.抄録全体を表示PDF形式でダウンロード (2056K) -
粟谷 丈夫, 峯垣 松生1963 年 29 巻 203 号 p. 1189-1196
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーYoung's modulus of polyethylene, γ-ray irradiated, was measured by a vibration method and effects of radiation dose, the atmosphere in which radiation is done, the thickness of samples irradiated and so forth acting on crosslinking were studied. Main results are as follows : (1) the degree of crosslinking of samples irradiated in vacuum is remarkably larger compared with that irradiated in air, (2) the thinner the samples, the lower the degree of crosslinking and (3) for thin samples irradiated in air, the proportional relationship between the degree of crosslinking and radiation dose is not held, and irradiation has complicated, rather harmful, effects on the mechanical properties such as yield stress and wear resistance. In appendix, theoretical approach is shown for a composite oscillator which consists of the sample and the reed.抄録全体を表示PDF形式でダウンロード (953K) -
八木 明1963 年 29 巻 203 号 p. 1197-1208
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーFollowing the abrasion test of high manganese steel under the dry condition which was reported by the author, the present test has been carried out, using an abrasion testing machine of Amsler type, at various speeds ranging from 0 to 15 cm/sec and under various contact pressures ranging from 50 to 90kg/mm2. This test piece of tyre is of standard structure steel, containing about 0.7% C, and the other materials are deposited weld austenitic Mn-Cr steel, austenitic Mn-Ni steel, and austenitic Mn-Mo steel. The ideal combination of these austenitic manganese steel and tyre was resarched under the influence of lubrication in which same number of drops of Motor-oil (# 40) was supplied every day. The result of this resarch is as follows : 1)"Pitting" of the austenitic manganese steel is less than that of carbon steel, therefore the wearing amount of specimen is very little and the effect of lubrication is very remarkable. 2)The fact that the effect of wear prevention on the austenitic manganese steel is satisfactory under the influence of lubrication is supposed to be layer of work hardening.抄録全体を表示PDF形式でダウンロード (2906K) -
斎藤 秀雄, 永井 常男1963 年 29 巻 203 号 p. 1210-1216
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーIn this paper a solution is given two-dimensionally for the problem of extensional stress wave propagations and vibrations of sandwich plates. Both the sandwich core and the facings are assumed elastic and homogeneous, and the facings are identical with each other. The solution satisfies exactly the elasticity equations and the boundary conditions. Wave velocity-wavelength curves are then obtained from frequency equations for an infinite plate in plane strain. Using these results the vibrations of finite sandwich plates are also discussed. Numerical examples are given for the plates composed of aluminum and plastics.抄録全体を表示PDF形式でダウンロード (589K) -
溝口 孝喜1963 年 29 巻 203 号 p. 1217-1225
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーIn this paper, the state of vibration of a circular cylindrical shell which is rotating about its axis with a constant angular velocity is discussed utilizing the fundamental differential equation derived by the present author. The relations between the angular velocities of the nodes and those of the shells in various wave patterns are obtained, and in the particular case where the shell vibrates as a beam, the relation between the critical speed and the natural frequency is also discussed.抄録全体を表示PDF形式でダウンロード (815K) -
溝口 孝喜, 井上 慶之助1963 年 29 巻 203 号 p. 1226-1235
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーIn the previous report, the strength of a horizontal reservoir supported at both ends and completely filled with a liquid was discussed, utilizing the fundamental differential equation introduced by Dr. K. Mizoguchi, and on comparing the results with those obtained by Timoshenko's method, it was pointed out that the latter's method, was inadequate. In this paper, the strength of the same reservoir, being partially filled with a liquid, is discussed on utilization of the same method as before. In this case, the behavior of the deformation of the shell is very complicated; e.g. the deflection is larger in a lower head than in a higher head of the liquid, which shows that the use of the approximate method such as that of simplified equation or the energy method is very dangerous.抄録全体を表示PDF形式でダウンロード (834K) -
溝口 孝喜, 井上 慶之助1963 年 29 巻 203 号 p. 1237-1246
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーThe strict analysis for strength and deformation of a thin circular cylindrical shell under a varying radial line load distributed around the circumference at a section has not been developed. In this paper, as an example of the problem, the strength and deformation of a drum supported at both ends under a line load in the middle through a rope is discussed, utilizing the fundamental differential equation introduced by Dr.K.Mizoguchi, and an experiment is made for checking this analysis. In this case, the behavior of the deformation of the shell is very complicated as in the case of the previous report; e.g. the deformation of the shape of section is so large that the uppermost and lowest sides deflect upwards, opposed to the deflection obtained by the beam theory, which shows that the use of the approximate method such as that of simplified equation or the energy method is very dangerous.抄録全体を表示PDF形式でダウンロード (818K) -
椹木 義一, 砂原 善文, 中溝 高好1963 年 29 巻 203 号 p. 1247-1254
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーIn this paper, a practical synthesizing technique, in the statistical sense, of the optimum nonlinear control system subjected to non-Gaussian random inputs is presented. The technique described here is a method of circumventing difficulties of mathematical treatment. The description begins with the construction of the optimum nonlinear filter under the excitation of non-Gaussian time series. It is analytically shown that the optimum nonlinear filter consists of a nonlinear element of zero-memory type sandwitched between two linear filters. By applying these results to the synthesis of feedback control systems with a random signal in the presense of non-Gaussian random noise, the optimum control system containing a nonlinear element is derived. Detailed descriptions of these synthesizing procedures are illustrated by several examples.抄録全体を表示PDF形式でダウンロード (812K) -
三巻 達夫1963 年 29 巻 203 号 p. 1255-1262
発行日: 1963/07/25
公開日: 2008/03/28
ジャーナル フリーIn adaptive control systems, the parameters of the controller are adjusted to obtain an optimum response using some performance index and the root mean square error value criterion is widely used as the most general and powerful performance index. This paper shows a new performance index an attention being paid to the frequency of zero crossings where the error signal crosses the zero value at a specified velocity. If the value of the specified velocity is selected appropriately and if the parameter is adjusted to maximize the frequency of zero crossings in adaptive control systems, the same result is obtained as the one obtained by the root mean square error criterion. Here the theoretical treatment of this performance index and some results by analog computer are presented.抄録全体を表示PDF形式でダウンロード (1196K)
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