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20 巻, 91 号
選択された号の論文の19件中1～19を表示しています
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中川 有三, 奥田 聰1954 年 20 巻 91 号 p. 125-129
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーIn this paper, the authors describe the results of study on Poisson's ratio of cast iron. For cast iron, it is not ordinarily easy to make a perfect flat surface so sufficient as to be adaptable to the interference measurement. Therefore, the authors intend to improve this method to be applicable to the case where a slight convexity in the polished surface is permitted. They were able to improve the results of ordinary method by measuring the translation of fringes due to variation of load and by calculating convexity and obtained the more correct value of Poisson's constant by this method. They confirmed experimentally that this material constant varied according to internal stress and discussed this problem comparing with the results of NAKAGAWA's theory for non-linear elasticity.抄録全体を表示PDF形式でダウンロード (920K) -
中川 有三, 奥田 聰, 松居 国夫1954 年 20 巻 91 号 p. 129-132
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーThe object of this study is to find the distinct knowledge of the physical meaning of impact hardness. The experiment was made using the tester of pendulum type. From the results of our experiments, we have comfirmed that the similar expression to the equation P=ah0+bh02 for th estatic indentation was applicable to the dynamic indentation and the ratio of elastic recoil (h0-h) to the instantaneous maximum depth of indentation h0 was almost equal to the ratio of rebounding height H2 to falling height of hammer H1. (h is the permanent set of indentation.) Therefore, it is appropriate to consider that one may use the ratio H2/H1 as the measure of hardness.抄録全体を表示PDF形式でダウンロード (578K) -
中川 有三1954 年 20 巻 91 号 p. 133-136
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーThe author intends to explain the relation between the Shore hardness and the indentation hardness and then to clarify the nature of the former. In measuring the Shore hardness for a given material, a light hammer provided with a small ball is used. Let us denote the resisting force of material at an instant in the compressing period by P and the corresponding depth of indentation by x, then we may write P=ax+bxn. By using this relation, he obtained the relation HS=HB/HE where HB=Brinell hardness number. HE should be called elastic hardness. This expression means that the Shore hardness is proportional to the Brinell hardness for all the materials having equal elastic properties, for example for the ordinary carbon steel from mild to hard steel.抄録全体を表示PDF形式でダウンロード (581K) -
町田 周郎1954 年 20 巻 91 号 p. 136-141
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーIn this report, the behaviour of the effect of pressing force of the measuring tube on Shore-hardness number was investigated. Under the general requests for the testing with the Shore scleroscoper being satisfied, and especially attending to free from the effect of velocity of the operating handle with consideration of the result of the last report, using 3 Shore scleroscopes of D-type, and many specimens which were different in hardness or in material, hardness numbers were measured with varieties of pressing force from 0 to 75 kg. As the results, the behaviour of the effect of pressing force of the measuring tube on hardness number was made clear. The critical (minimum) pressing force to free from this effect was decided according only to hardness of the specimen and not to the material or the tester. An exponential relation was existed between the critical pressing force and hardness of the specimen, therefore the critical pressing force increased according to hardness of the specimen. This result was compared with the results published hitherto, and the latter were included the former but few cases.抄録全体を表示PDF形式でダウンロード (876K) -
西原 利夫, 遠藤 吉郎1954 年 20 巻 91 号 p. 142-146
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーThe endurance diagrams indicating the influence of mean stresses on allowable stress amplitudes were obtained for a cast iron under bending and torsional moments, and the theory of fatigue failures reported previously is further confirmed. For fatigue failures of notched test pieces, we propose a new view that the stress concentration factor for fatigue failures is to be determined by the concentration factor of tensile principal strain, which is calculated, using "micro-Poisson's constant", with regards to the principal stresses concentrated due to the notch effect in the direction of the stress.抄録全体を表示PDF形式でダウンロード (784K) -
大矢根 守哉, 小島 公平, 中原 益治郎1954 年 20 巻 91 号 p. 146-150
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーTwo kinds of experimental repsults are reported. One of them is the experiments on plastic deformation of metals under three axial stresses. The cylindrical specimens of mild steel were deformed up to rapture by axial tensile force and external pressure. The more severely the specimens were compressed by external pressure, and by the lower tensile stress the specimens were deformed, and it has been recognized that the theory of octahedral shearing stress can be applied to plastic deformation under three axial stresses. Another experiments were carried out for the study of plastic deformation under two axial stress, where the stress ratio is variable. The relationship between octahedral shearing stress ratio, and these experimental results show that the deformation hysteresis should be taken into account for study of plasticity.抄録全体を表示PDF形式でダウンロード (781K) -
大矢根 守哉, 小島 公平, 中原 益治郎1954 年 20 巻 91 号 p. 151-155
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーThe anisotropic behavior in plastic deformation of the metal under two dimentional stress was studied sxperimentally, where stress ratio varied discontinuously during deformation. For example, the relationship between stress components and strain components was measured and the octahedral shearing stress strain curve was calculated from the tension test under the constant pressure 100kg/cm2 on a thin-walled tube of steel, which had been previously deformed under tensile force and the constant pressure 44kg/cm2. The conclusions are that the real material deforms, after sudden variation of stress ratio, just as ideal isotropic material would deform when the stress ratio varied a little more, and that the abrupt lowering of stress strain curve corresponds to discontinuity of stress ratio.抄録全体を表示PDF形式でダウンロード (810K) -
大内田 久, 小泉 弘1954 年 20 巻 91 号 p. 156-161
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーA flat end plate with a manhole is preferable for a pressure vessel such as a steam receiver of high pressure boiler, when the ratio between diameters of the man-hole and the end plate is larger than 50%. A new approximate caluculating formula was induced taking the boundary conditions at a joint part of the end plate and cylindrical part into consideration, assuming that manhole to be a circular hole having a diameter equal to the lengeh of major axis of an elliptical manhole, that the radius of the end plate to be equal to the distance from its centre line to the outer edge, and that the radius of corner fillet at a joint part to be negligible. The results of the model test and other methods of investigation prove that the calculated stress value agrees with that from experimentation. From the test were also obtained calibration curves of stress from the effects of the radius of corner fillet at the joint part and a roundness radius at the outer edge of the end ptate. Then following simplifled formula by which the thickness of the end plate with a manhole is conveniently calculated was induced.[numerical formu]抄録全体を表示PDF形式でダウンロード (1217K) -
松岡 健次, 中島 粂男1954 年 20 巻 91 号 p. 161-166
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーThe bending of rotating circular plate due to transverse load has been investigated as a problem of an integral equation. It is shown that the solution is expressed as an infinite series, after successive substitution is applicable to numerical calculation, for its convergency is very rapid in the practical range of rotating speed. As a numerical example, the stresses and deflections of a rotating circular plate with small initial curvature of paraboloidal shape are calculated at various rotating speeds, and their tables and curves are given.抄録全体を表示PDF形式でダウンロード (704K) -
野村 恭雄1954 年 20 巻 91 号 p. 167-173
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with the effect of two crossed bars that have been fitted into a circular hole with the object of stiffening the edge of the hole, on the stress distribution in orthogonally aeolotropic plate (e.g. wooden plates) under uniform tension. Consequently, the bar that was inserted in the hole perpendicular to the direction of pull did more harm than good fegardless the material of which the baris made, while the bar that was inserted parallel to the direction of pull quite efficient except the bar which had larger Young's modulus than that of the wooden plates. (e.g. steel bar)抄録全体を表示PDF形式でダウンロード (798K) -
八巻 昇1954 年 20 巻 91 号 p. 174-180
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーIn the preceding reports, approximate solutions for this problem were obtained by simplifying the stress distribution in the rectangular plate. In this report, the problem is treated rigorously. That is, the actual stress distribution is first investigated and then, by using the Ritz's method, the critical value of the load is shown to be given by a determinant equation. The problem is solved for the following two cases, i.e., (a) rectangular plate with all four edges simply supported and (b) rectangular plate with loaded edges simply supported and the other edges clamped. In each case, the critical values of a pair of concentrated forces for rectangular plates with various length-width-ratios and those of locally distributed forces for a square plate are calculated and the results are tabulated and discussed.抄録全体を表示PDF形式でダウンロード (777K) -
渡辺 嘉郎1954 年 20 巻 91 号 p. 181-190
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーThe object of this paper is to find a solution for the two-dimentional problem of a strip plate under a concentrated traction acting on one straight edge. By the transfomation z=tanh (πw/2t), where z=x+iy and w=φ+iψ, the strip between ψ=0 and ψ=t is conformally represented upon the half-plane y>0. In the case where a single force P acts at the origin in the (x, y) plane in the positive direction of the axis of y, the solution is given by the following equation : [numerical formula] where Δ is the "dilatation", ω is the "rotation". Transforming to (φ, ψ) plane, and by means of the equation [numerical formula] we find [numerical formula] from this equation displacements in the (φ, ψ) plane can be obtained as follows : [numerical formula] where the function "f" is the "plane harmonic function". Determining [numerical formula] we can easily calculate the stresses in a strip of width "t" subjected to a single force 2t/π·P at the origin in the positive direction of the ψ-axis, and normally distributed pressure of amount P/{1+cosh(πφ/t)} per unit length on the edge ψ=t.抄録全体を表示PDF形式でダウンロード (1186K) -
佐藤 千之助1954 年 20 巻 91 号 p. 191-196
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーIn this paper, an approximate solution is derived for a twisted shaft with circumferential notches periodically situated along its length. The solution for the extreme case where the dimensions of notches are infinitely small, has been obtained previously by Neuber. The present solution, however, is of sufficient accuracy for practical use even in the range of moderate dimensions of notches. The maximum torsional stress has been evaluated for various values of the radius of a notch. The ratio of maximum stress for multiple-notches to the corresponding one for a single-notch has been obtained, using two different formulas for a single-notch, previously obtained by Sonntag and Okubo respectively, and the validity of the two formulas is discussed.抄録全体を表示PDF形式でダウンロード (806K) -
赤坂 隆1954 年 20 巻 91 号 p. 196-200
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーIn order to know the local deformation and stress state near the contacting part of loaded tyre with the ground, a model case where a spherical balloon is compressed by two flat rigid plates from the opposite sides without friction, is analysed from the view-point of non-linear membrane theory. The so-called boundary layer solution is obtained. The local deformation and stress state can be explained by the boundary layer effect more precisely through the results of a nummerical example.抄録全体を表示PDF形式でダウンロード (743K) -
林 毅1954 年 20 巻 91 号 p. 201-207
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーThe strength of the side structures of railway passenger cars has usually been analyzed as a "composit beam", namely, by assuming that the side structures are made of two beams pin-jointed with struts between them. But the side structures are recently designed as rigidly jointed structures, i.e. rahmen structures. The method of slope-deflection analysis can be rationally applied to such structures. Assuming that the external normal load can be taken only by the side stuuctures, the theory of analysis was studied for the structures as shown in Fig. 1. The structural function of upper and lower beams and struts and their mutual action of cooperation were made clear. It was also found that the rigidity EI'/l' and the shear rigidity of struts have an important role for increasing the beam action of side structures so as to be a beam as a whole, and the larger their values are, the greater the effectiveness of struts becomes.抄録全体を表示PDF形式でダウンロード (889K) -
西原 利夫, 郡 利矩, 谷 哲郎1954 年 20 巻 91 号 p. 208-215
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーWe established a fundamental differential equation of the statics of powder, relation between principal stress and principal strain and relation between stress and principal strain. As the deformation or the strain of powder, when it is pressed, is very large we used the logarithmic strain which is suitable in this case. Next we found a simple method to calculate the stress distribution by the aid of some experiment without solving the fundamental diff erential equation. The method is that we inserted some indexes to know the displacement of points in the powder and we found length of the principal axes of the strain ellipsoid. By the length of these axes we can calculate the stress distribution using the relation described above.抄録全体を表示PDF形式でダウンロード (1048K) -
下山 美徳, 山本 敏男1954 年 20 巻 91 号 p. 215-222
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーUsually, the uniformity of flexural rigidity of bearing pedestals in all directions may not be obtained. Owing to this non-uniformity of the rigidity, the critical speeds of synchronous backward procession can occur for the shaft with one disc. The results obtained may be summarized as follows : 1) There are two critical speeds, one is higher than the major critical speed, another is lower. 2) The amplitudes increase with the non-uniformity of the rigidity of pedestals. 3) Such critical speeds can occur for disc either loosely mounted or not. 4) The amplitudes vary as the location where a disc is attached to the shaft.抄録全体を表示PDF形式でダウンロード (1106K) -
渡辺 茂1954 年 20 巻 91 号 p. 222-226
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリー(1) It is shown that the amplitude of a system with Backlash must be very large by the force whose frequency is a half, a third, twice or thrice of the natural one of the system. (2) It is explained that surging phenomena, which occur at the natural frequency of the system, are concerned with the non-linear characteristics of backlash.抄録全体を表示PDF形式でダウンロード (904K) -
椹木 義一, 得丸 英勝1954 年 20 巻 91 号 p. 226-231
発行日: 1954/03/25
公開日: 2008/03/28
ジャーナル フリーPreviously, the authors proposed a more general fundamental formula of dynamic behaviour of materials in consideration of the after effect element having stress dependency, and mentioned that the dynamical behaviour of vulcanized rubber follows after the special case of this formula, in which case the dynamical behaviour is characterized by two functons Φ(υ) and ψ(s) and a constant E. In this paper, it is mentioned how to determine thses functions of the materials by vibration test, and they decided thses functions about tread and gum type stocks of rubbers.抄録全体を表示PDF形式でダウンロード (759K)
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