日本機械学會論文集
Online ISSN : 2185-9485
Print ISSN : 0029-0270
ISSN-L : 0029-0270
18 巻, 71 号
選択された号の論文の14件中1~14を表示しています
  • 渥美 光
    1952 年 18 巻 71 号 p. 1-6
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    In this present paper, in order to solve the general problems of the stress distributions in an infinite plate having an infinite row of equal and equally spaced holes the tractions applied to which are regarded as similar, using almost the same method used by Howland in his paper published in 1935, the three stress functions x1, x2 and x3 are introduced anew. x1 is even in x and odd in y axis, x2 is odd in x and even in y axis, and x3 is odd in x and y axis, and they are expressed by means of some sets of periodic functions all derivable from one fundamental function. The results obtained are applied to the problems of the cases of simple bending or shearing and these stress distriburions are obtained clearly.
  • 永島 菊三郎, 柴原 正雄
    1952 年 18 巻 71 号 p. 7-12
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    In succession to previous studies, the writers, in this paper, made a theoretical study on the stress in aspoked wheel under tangential load. For numerical examples, treating the wheel of railway rolling-stock with eight spokes, stresses in the rim, tire and spokes were calculated. As the results of these calculations the following conclusions have been drawn. Stress produced in the rim side root of spoke, especially bending stress is far larger than the stress in the tire and rim, its value being 776 kg/cm2, and this is 2·2 times as large as that under vertical load. Moreover, under tangential and vertical loads, this bending stress increases to 1097 kg/cm2.
  • 加藤 良太郎
    1952 年 18 巻 71 号 p. 13-16
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    As the cylinder of a given length, worked and treated with heat, is liable to conples deformation by the residual stress due to boring, the author studied the residual stress as a two dimensional problem. As Sachs' formulas, which are commonly used, hold good only when dp is infinitely small, the author tried to deduce the formulas representing the mean of each of the three internal stresses when Δp is finite. These formulas will give the stresses of the central part and may also be applied to solid cylinders. The correction formulas, obtained by comparing Sachs' with the author's, show the difference between dp and Δp, and also indicate that the values of the internal stresses near the central part, calculated by Sachs'formulas, need some corrections.
  • 吉本 源之助, 花房 秀郎
    1952 年 18 巻 71 号 p. 17-20
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    When the spiral spring is wound, the stresses produced in it will come to plastic region. In the first place we obtain the permanent deformation of the spring after the initial winding, with reference to the mechanical properties of the material and the deformation when initially wound up. Then considering the change of shape of the spring by winding, we show a graphical method of calculation for the relation between the torque and the angle of the rotation of one end of the spring with respect to the other. By this method we could obtain the results in good accord with the experiments.
  • 島田 平八
    1952 年 18 巻 71 号 p. 21-23
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    Properties of the circular bar with a rectangular notch are researched, with special reference to tension, intending to clarify the influence produced by the depth and breadth of the notch upon the breaking stress of the several test pieces. In the experiments, steel bar test pieces of 1.5cm dia., having the following 36 types of rectangular notch are stretched out by Olsen-type universal testing machine. Breadth of notch=0.1, 0.2 and 0.3cm. Depth of notch=0.1, 0.2, 0.3, 0.4, 0.5 and 0.6cm. Consequently, the relations between the ultimate strength and the sectional area of notch are obtained, and true breaking stresses are the same with all the test pieces except for circular bar with no notch or with a deep notch.
  • 大矢根 守哉, 小島 公平, 中原 益次郎
    1952 年 18 巻 71 号 p. 24-26
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    The experiments were carried out to study the stress-strain relation in the metal under combined stress condition. In the case concerning the 1st report, the tubular specimens of 0·4%C steel with the open ends or the closed ends were at the first time deformed up to plastic range by internal oil pressure, which was removed soon, and then the specimens were subjected to tensile force in the axial direction. Experimental results : (1) The more severely the specimens with the closed ends were strained in the pressure tests, the greater the material was strain-hardened by the tensile strain except the non-prestrained specimen. (2) In the case of the specimens with the open ends, the elastic limits became lower with increase in the amount of the prestrain, while strain-hardening by tensile strain was greater in the range of large strain.
  • 益田 森治, 中村 哲哉
    1952 年 18 巻 71 号 p. 26-30
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    The deformation of plastic bending in the sheet metal working is so complex that the analysis is very difficult. The purpose of our research is to get the hint of solution of this problem. So we compared the results of the calculation with that of the bending tests which performed with aluminium plate 1.5 mm in thickness. At first, we performed tension tests to determine tensile stress-strain diagram, and compressive stress-strain diagram was determined from the results of bending tests. Next, we obtained the relation between bending moment M and bending angle θ in these cases where the neutral axis does not change, the neutral axis changes and the breadth is very wide. Then, we compared these results with the bending moment M and the bending angle θ which we got by the experiment. The conclusion is that the analysis of bending may be based on the results of the tension tests only.
  • 天雲 浩, 蓮井 淳, 斎藤 辰雄
    1952 年 18 巻 71 号 p. 31-34
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    The short time tensile strengths of the butt welded mild steel and 18/8 austenitic steel, compared with the unwelded base metal, are tested at a certain temperature up to 925°C. At every temperature the welded parts indicate no much difference from the base metals in tensile strengths, but elongation percentage and reduction of area of the welded parts are far less than those of base metals. From this phenomena it is surmised that gasses and carbon absorbed in deposite during welding process combine with Fe and Cr etc. and intercrystalline weakness is associated with these compounds.
  • 西原 利夫, 三木 英雄
    1952 年 18 巻 71 号 p. 34-38
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    During the rotating-bending fatigue tests, the logarithmic decrements of 0.1% carbon steel (cold drawn wire rod, 3.25 mm in diameter) are measured by the damping method in a frequency range from 56 to 2 250 cps., and the mechanism of fatigue fracture is studied from the change of the internal frictions. It is concluded that the intercrystalline strain gradient induced within the material as a result of repeated stresses plays an important role and the imperfection of the structure plays the secondary role in the fatigue failure, which sets in as microscopical cracks within the crystals in the earlier stage of the repetition of stresses and propagates itself to cause the fracture of the whole material.
  • 岡本 正三, 蓮井 淳
    1952 年 18 巻 71 号 p. 38-41
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    The wear resistance of the Mg-treated nodular irons having various matrix structures under sliding contact to the rotating discs made of grey iron or Ni-Cr steel was measured. The sliding velocities were 4.2m/sec and 2.5m/sec, and the contact pressure was 8.3kg/cm2. When worn against pearlitic iron having flaky graphite, the wear amount of nodular iron is smaller than that of flaky iron. If worn against steel, it is difficult to find difference in the wear resistance between nodular and flaky iron. It is presumed that the self-lubricating property of flaky iron is larger than that of nodular iron.
  • 河本 実, 広惠 章利, 伊吹 幸彦
    1952 年 18 巻 71 号 p. 42-47
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    In the 1st report we made experiments on the abrasion resistance of phenol resin in the dry state with the Amsler abrasion testing machine. The following six kinds of phenol resins were applied to tests : that is, two kinds of molded products (cotten linter filler and wood flour filler) and four kinds of laminates (canvas base, kraft paper base, asbestos base and plywood.) For comparison's sake, we made experiments also on cast bronze and medium carbon steel. In these abrasion tests, the materials paired with the specimens of the above-mentioned materials were always medium carbon steel and were fixed, while the specimens were rotated at a peripheral speed of 0.5 m/s. Experiments were made till the rubbing distance of about 6 km. And amount of abrasion, frictional moment and temperature were measured. As the results, the superiority of abrasion resistance of phenol resin was cleared.
  • 河本 実, 広惠 章利, 渡辺 忠淳
    1952 年 18 巻 71 号 p. 48-54
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    In the 2 nd report we made experiments on the abrasion resistance of phenol resin in the dry state at various speed with the new abrasion testing machine specially designed, using tubular specimens. The two kinds of laminates (canvas base and kraft paper base) were applyed to tests. As in the previons report, we made experiments also on cast bronze and medium carbon steel. The specimens were rotated at the following five kinds of mean friction speed : that is, 0.33, 0.45, 0.63, 0.98 and 1.35 m/s. And amount of abrasion, frictional moment and temperature were measured. Also we made some experiments to clarify the effect of direction on the abrasion resistance of laminates. From the results obtained in this report, we made some considerations on the abrasion mechanism of phenol resin.
  • 池沢 和男
    1952 年 18 巻 71 号 p. 54-59
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    To obtain accurate impact values within the limitations of impact testing machine of moving pendulum (Charpy, Izod, Izod-Charpy etc.), we must consider about a correction for the energy absorbed by friction in the machine bearing, for the loss due to air drag and frictional pointer. (1) Author has made clear up the theory about the energy absorbed by friction in the bearing and loss due to air drag quantatively. (2) In order to promote accuracy of the impact testing machine we prefer reducing air drag to friction of the bearing ; Coefficient of air drag against the moving pendulum Cx is 0.98∼0.66 for Charpy and 1.43∼0.93 for Izod testing machines general in use. (3) Computed value of decrement of angle γ0 due to friction in the bearing, frictional pointer and air drag. we can utilize to correct impact value at any angle of fall. (4) We can get frictional coefficient of the bearing by simple calculation in error of 1%.
  • 小柳 孝巳
    1952 年 18 巻 71 号 p. 60-61
    発行日: 1952/07/15
    公開日: 2008/03/28
    ジャーナル フリー
    In this paper I calculate the relation between number of revolution, displacement of sliding stem and force acting on sliding stem of the governor made by plate spring, applying the solution of a severely bent cantilever, and express the relation in simple equations. Moreover, the sensibility and the stability of the governor, and the stress of spring are investigated.
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