材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
17 巻 , 180 号
選択された号の論文の9件中1~9を表示しています
  • 池田 豊
    1968 年 17 巻 180 号 p. 783-792
    発行日: 1968/09/15
    公開日: 2009/06/03
    ジャーナル フリー
  • 前田 松夫, 田中 賢治, 筧 勝次
    1968 年 17 巻 180 号 p. 793-799
    発行日: 1968/09/15
    公開日: 2009/06/03
    ジャーナル フリー
    The anisotropy of Young's modulus of FRP reinforced with glass yarns, lying parallel, was first experimentally examined, and then its relation with the elastic constants of the constituents was analyzed by assumption of a mechanical model representing the two phase composite system.
    Although Young's moduli increase in each direction with an increase of glass volume fraction, the increase in Young's moduli in a direction making the angle θ=30∼90° to the warp direction are very small, in comparison with those values measured in the direction of θ=0∼15°.
    Therefore, the effect of reinforcement on Young's modulus is very small in the direction of angle θ=30∼90°.
    The measurement of Young's modulus of the sample shows the minimum value in the direction between θ=45° and θ=60°.
    This minimum value is to be accounted for by two main factors the one is the existence of constraint restricting the deformation of the yarn and resin on their contact surface, and the other is the anisotropy of the glass yarn.
  • 秋山 正久, 野田 藤武, 影山 信夫, 藤田 朗夫
    1968 年 17 巻 180 号 p. 800-805
    発行日: 1968/09/15
    公開日: 2009/06/03
    ジャーナル フリー
    For the purpose of improving the capacity of the clamp implement for the drop wire, studies have been made of the clamp implement with reference to its necessary conditions for the purpose, and also of the interrelations between the size, the shape, the combination of each contact guide, the clamping power and the damage load of PVC sheath, and the standard design of the clamp implement has been specially investigated.
    The results obtained are as follow,
    (1) The damage load of PVC sheath increases linearly with the radius of contact guide, and the increase of contact area is valid.
    (2) The clamping power increases with pressure angle and back tension, and the increase of contact area is valid.
    (3) The clamping power and the damage load of PVC sheath are variable, dependent on the relative position of the friction part and the back tension part, and it is most important by what type of function these two parts are separated.
    On the results of these experiments a clamp implement has been developed of polyvinyl chloride and shaped by pouring the material into the mold and hardening the same, to substitute the accustomed metal implement. The new polyvinyl clamp implement, with its characteristic features over the metal work mechanically and operatively, and not being subject to corrosion, is more highly marketable, and possible of massproduction besides.
  • 大野 啓充, 鯉淵 興二
    1968 年 17 巻 180 号 p. 806-812
    発行日: 1968/09/15
    公開日: 2009/06/03
    ジャーナル フリー
    In the previous paper, the authors reported a method for rapid estimation of rotating bending fatigue limit by temperature measurement of a specimen under gradually increasing sequence of load, using a new thermometer for rotator.
    In this report, the same attempt was made to estimate axial and plane bending fatigue limits of various types of specimens, by temperature measurement of the specimens by means of copper-constantan thermocouples. The diagram of stress amplitude-temperature shows in this case the same rising trend as in the case of the rotating bending test except for the sharp notched specimen investigeted. In other words the diagram can be divided into three parts, the gradually increasing region, the linearly increasing region and the rapidly increasing region. The fatigue limit is very close to the stress amplitude, at which the temperature begins to deviate from the linear portion to the rapidly increasing portion. Furthermore, it is found that the temperature rise of the specimen has close relation to the plastic strain reversed during the fatigue test. Thus, the fatigue limit can also be estimated from she amplitude diagram of stress and of strain. For the V-notched specimen investigated, these behaviors are not noticeable because the plastic deformation is considered to be localized at the notch root.
    The stress gradient of the specimen may influence the stress amplitude-rising temperature rise diagram.
  • 平 修二, 井上 達雄, 高尾 武
    1968 年 17 巻 180 号 p. 813-819
    発行日: 1968/09/15
    公開日: 2009/06/03
    ジャーナル フリー
    Unsteady thermal stress of thick-walled cylinder in the case of rapid cooling of the bore was analyzed by two methods; the elastoplastic stress analyzed by successive approximation proposed by S. S. Manson, and the viscoelastic stress according to the associate elastic problem, applying the analogy between the elastic and the viscoelastic solution.
    Numerical calculation was also made of the stress for the cylinders of several dimensions.
    The theoretical stress distribution was compared with the experimentally decided stress distribution based on the residual stress, and it was found that there was very good agreement between them.
  • 土井 浩, 坂上 守
    1968 年 17 巻 180 号 p. 820-825
    発行日: 1968/09/15
    公開日: 2009/06/03
    ジャーナル フリー
    The testing methods of characterizing the impact behavior of film materials can be classified into two types; the uniaxial tensile impact tests and those multiaxial. The former are of theoretical interest on account of their analytical simplicity, but are often open to question regarding their practical use. The conventional standard tests which fall on the latter category, on the other hand, are widely used because of their good correspondence to the actual impact situations encountered, yet very few results of their analytical studies have so far been announced.
    In this paper the authors report a newly designed impact test of more practical significance, and propose some approaches to the analysis of the experimental data.
    The feature of this apparatus is that the films are tested by allowing a membrance-shaped specimen attached to the ram to fall on the semispherically edged mandrel, and thereby to be pierced and fractured, and that the load-deflection curves can be provided by the synchroscope through the load-cell connected to the mandrel.
    In an attempt to determine the impact characteristics from the diagrams obtained, the authors set up two approximate expressions for the stresses from the different standpoints, by which the ultimate impact strengths were calculated; one deduced from the deflection pattern and the other on the analogy of the thin plate with large deflection problem in the theory of elasticity.
    The static penetration tests with the same jig and the static tensile tests on an Instron type tester were also conducted to compare the applicability of the two equations above mentioned.
    The results show that, for the film materials such as polyethylene and polypropylene which show large ultimate elongation, the stress equation based on the scheme provides a good basis for the analysis, while to polystylene and cellophane which exhibit only little elongation at break, the stress equation based on the elastic membrane analogy can be applied more successfully.
  • 大石 不二夫
    1968 年 17 巻 180 号 p. 826-831
    発行日: 1968/09/15
    公開日: 2009/06/03
    ジャーナル フリー
    In this report a new method of explaining the fatigue of plastics in terms of the change of their properties is proposed. The fatigue testing machine used here is ASTM (D 671-63 T, Method B) type, constant amplitude of force, cantilever flexural fatigue, and is equipped with differential transformer displacement meter and the moment bar with strain gage. According to the dynamic rheological theory, |E*|=σ00=KP0/d0 where |E*|: absolute value of complex dynamic Young's modulus, σ0·ε0·P0·d0: peak value of stress·strain·load·deflection respectively, K: size parameter of specimen, and K was derived as follows. In the case of rectangular specimen K=4L3/bh3 and ASTM type triangular specimen K≈3L2/tan θ h3 where L·b·h·θ: distance between both grips·width·thickness·inclination angle of side line, of specimen respectively. When K, P0 are given, the change of |E*| can be observed during the fatigue test by measuring d0 continuously with dynamic displacement meter.
    The results of experiment show that the change of d0 and the temperature rise of specimen are characteristic of the materials, though the calculation of |E*| has sometimes been disturbed by the rise and growth of crack in the specimen. It is concluded that this method is applicable to the study of the fatigue of polymeric materials.
  • 1968 年 17 巻 180 号 p. 832-838
    発行日: 1968/09/15
    公開日: 2009/06/03
    ジャーナル フリー
  • 変形・強度の時間的変化
    赤井 浩一, 柴田 徹, 桜井 春輔
    1968 年 17 巻 180 号 p. 839-844
    発行日: 1968/09/15
    公開日: 2009/06/03
    ジャーナル フリー
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