材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
12 巻 , 113 号
選択された号の論文の7件中1~7を表示しています
  • 岡田 清
    1963 年 12 巻 113 号 p. 68-71
    発行日: 1963/02/15
    公開日: 2009/08/20
    ジャーナル フリー
  • 村山 朔郎
    1963 年 12 巻 113 号 p. 72-78
    発行日: 1963/02/15
    公開日: 2009/08/20
    ジャーナル フリー
  • 関 護雄
    1963 年 12 巻 113 号 p. 79-83
    発行日: 1963/02/15
    公開日: 2009/06/03
    ジャーナル フリー
  • 米谷 茂
    1963 年 12 巻 113 号 p. 84-92
    発行日: 1963/02/15
    公開日: 2009/06/03
    ジャーナル フリー
    The author reported, in the first report, a method of measurement of the residual stress in the heat treated solid cylinder with small diameter, consisting of the removal of surface layer of the specimen by corrosion and the measurement of the resultant changes of the length in axial direction and the specific volume of the remaining portion. In the present report, the author shows a method of measurement of the residual stress in the heat treated hollow or solid cylinder when the inner layer of the specimen is removed.
    Let 0σz, 0σt and 0σr be the residual stresses in the axial circumferential and radial direction respectively, further let εz and εv be the changes of axial strain and volume strain accompanied by removal.
    Then the three stresses 0σz, 0σt, 0σv are expressed as follows:
    0σz=E/1+ν{(fb-f)d/df(εz+ν/1-2νεv)-(εz+ν/1-2νεv)}
    0σt=-E/1+ν{(fb-f)d/df(εz-1/1-2νεv)-(fb+f)/2f(εz-1/1-2νεv)}
    0σv=-E/1+νfb-f/2f(εz-1/1-2νεv)
    where, E=Young's modulus.
    ν=Poission's ratio.
    fb=Cross sectional area in the outer diameter of cylinder.
    f=Removed area.
    The change of volume strain εv is, when we put v0 and v for the specific volume of the specimens before and after removal.
    εv=2(1-2ν)/3(1-ν)(v-v0)/v0
    The procedure and the actual data of measurement are explained. The effect of boring by cutting is also reported.
  • 藤村 義樹, 斉藤 葆, 後藤 美千男
    1963 年 12 巻 113 号 p. 93-98
    発行日: 1963/02/15
    公開日: 2009/06/03
    ジャーナル フリー
    In this experimental research, the authors carried out the repeated tension impact tests on butt welded joint connecting the plates of mild steels by using the universal repeated impact testing machine (Fujii type, capacity; 40∼5kg-cm, number of repetitions 600/min)
    In these tests, four types of specimens in rolling direction were prepared, which were as follows: (A) Butt welded joint specimens, as-welded condition. (B) The same, reinforcement machined off. (C) The same, stress relief heat treatment. (D) Base metal specimens.
    Some of the experimental results obtained are summarized as follows:
    (1) The E-N curves, which show the results of the tests, plotted in normal-log scale, discontinuously change from upper curves to lower curves, without exception. The specimens fractured with large scale plastic deformation on upper curves, and with true fatigue fractured surface on lower curves.
    (2) The fracture of all specimens on upper curves occurred at the parallel part of the base metal. On lower curves, the fracture of specimens at as-welded condition and of those machined off reinforcement occurred at the toe of the welded joint, while, the greater part of the heat treated specimens fractured at the fillet of the base metal, and the rest fractured at the toe of the joint.
    (3) The values of impact fatigue strength at 105 and 5×105 cycles were estimated from the results of the tests as shown by Table 3.
  • 河本 実, 仲嶋 浩, 野中 寿夫
    1963 年 12 巻 113 号 p. 99-107
    発行日: 1963/02/15
    公開日: 2009/06/03
    ジャーナル フリー
    Cylindrical solid specimens of 18-8 stainless steel were subjected to combined temperature and mechanical strain cycling independently and also cyclic straining at elevated temperature, and the number of cycles to failure were determined. Measurements of crack propagation speed and microstructural studies were made. The results were as shown below:
    (1) The inverse relationship between the mechanical strain range and the square root of the number of cycles to failure has been verified.
    (2) The maximum temperature is the most sensitive factor in thermal fatigue, and temperature difference may also be considered to be a controlling factor.
    (3) The life in thermal fatigue under cycling between maximum and minimum temperature is about 0.3∼0.1 of that in mechanical strain cycling under constant temperature.
    (4) Many differences between temperature cycling and constant temperature behaviors are observed.
    The paper describes the foregoing results in detail
  • 菅野 昭
    1963 年 12 巻 113 号 p. 108-114
    発行日: 1963/02/15
    公開日: 2009/06/03
    ジャーナル フリー
    In the previous paper, the present author gave a description of a fundamental investigation about the molecular structure and the mechanism of “Solvent-Cracking” on brittle lacquer coating prepared from calcium rosin as a basic ingredient, in order to find out the effectiveness improving strain sensitivity of coating contacted with various media.
    In this report, the interaction between the coating and various media is analyzed by considering the factors as follows:
    The analysis of interaction will be comparatively easy, if the media are non-polar, but these media used for improvement of strain sensitivity are generally polar such as polyfunctional alcohols having a complicated molecular shape and strong association tendency.
    As the result, it was been concluded that the interaction between coating and media, namely, the effectiveness improving the strain sensitivity of coating is proportional logarithmically to the initial dissolving rate of various media.
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