材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
29 巻 , 326 号
選択された号の論文の12件中1~12を表示しています
  • 長野 博夫
    1980 年 29 巻 326 号 p. 1063-1071
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
  • 山本 昇三
    1980 年 29 巻 326 号 p. 1072-1084
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
  • 下郡 一利
    1980 年 29 巻 326 号 p. 1085-1095
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
  • 保田 昌樹, 日根 文男, 渡辺 昌英, 岡田 尚哉
    1980 年 29 巻 326 号 p. 1096-1100
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    Electrochemical behaviors, mostly the static potentials and the polarization characteristics, of mild steel in hot concentrated NaOH solution were investigated to clarify the effects of heating on passivation and corrosion. The static potential of mild steel in boiling NaOH solution always lay in the active potential region when the specimen was accompanied with heat transfer even the passive film existed on the surface. The surface temperature of specimen was higher by 10°C at least than the boiling temperature of respective solution under normal pressure. This result suggests that active-passive transition of the static potential due to heat transfer is possible to initiate the caustic stress corrosion cracking of iron and/or steel whereas the detailed mechanism is still unclear.
  • 山川 宏二, 南野 康幸, 松本 桂一, 米沢 俊一, 吉沢 四郎
    1980 年 29 巻 326 号 p. 1101-1107
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    Hydrogen content in SCM 3 and 5 steels was measured as a function of electrode potential, temperature, sustained strain and strength of steel by using a modified electrochemical permeation technique with which nickel in replace of palladium was electrodeposited on the surface of specimen. The deformation of specimen was found to cause a significant increase in hydrogen content.
    The time to failure of the notched specimen, of SCM 5 steel was measure by changing stress and hydrogen content. The hydrogen content at the cracked part of specimen was estimated from a solution of diffusion equation and was found to be fair agreement with other studies. However, the specimen having a higher content of hydrogen prior to loading and a notch filled with resin showed a longer life. The reason of such abnormal phenomenon is not clear yet.
  • 植西 正裕, 中村 宏, 堀川 武, 市村 丈夫, 谷沢 正, 高杉 俊二
    1980 年 29 巻 326 号 p. 1108-1114
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    A new program system called“KAFSAS”has been developed for calculation of stress-frequency distribution, for easy handling of fatigue, crack propagation, thermal fatigue, creep and other relational data, and for fatigue life prediction.
    In the past 120 years, fatigue tests have been conducted on various specimens, structural components and machine parts, and a large amount of usefull results have been published. Unfortunately such results have been tabulated and/or schematically represented in a variety of fashion, so that one is often confronted with a difficulty in incorporating them for practical design purposes. It seem, therefore, very important to develop an appropriate computerized technique for feasible storage and retrieval of a number of available data by specifying a standard format for data input. The present system“KAFSAS”has the following three sub-systems.
    (1) Cycle counting system (KAFSAS-I),
    (2) Data store-retrieval system (KAFSAS-II), which is mainly explained in this paper, and
    (3) Fatigue life prediction system (KAFSAS-III).
  • 北川 孟
    1980 年 29 巻 326 号 p. 1115-1121
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    On estimating physical or mechanical properties of polycrystal by a three-dimensional orientation distribution function, two averaging procedures may be used. It has been found that the Young's modulus of polycrystal, Ecal, is better approximated, if the averaging procedure ignoring the interaction between crystals is used.
    With this averaging procedure, Ecal was calculated for aluminum-killed steel and rimmed steel by the following equation.
    Ecal=4/π2π/20π/20π/20E(ψ, θ, φ)w(ψ', θ, φ)sinθdθdψ'dφ
    where ψ, θ and φ denote a set of Eulerian angles between the coordinate system of crystallite and the reference system of specimen. ψ'=ψ+ω, and ω stands for an angle between the rolling direction and the stretching direction.
    Ecal was compared with the other averaging value, EV, calculated from the Voigt model by taking the interaction into account and the experimentally obtained one, Eobs.
    The results obtained were:
    (1) In both steel, Ecal was less than the others. That is Ecal<Eobs<EV.
    (2) With respect to planar anisotropy, the both models gave the values close to the observed one, although E varied depending upon direction as EL<ET<ED, where L, T and D refer to the rolling direction, the transverse direction and the direction with 45° to the rolling direction, respectively.
    The fact of Ecal<Eobs<EV was considered to result from the difference between the two procedures in dealing with the interaction. k(=(Eobs-Ecal)/Ecal) was quantitatively related to the following orientation-dependence factor, σ, with the assumption that the interaction depends upon the degree of intensity of preferred orientation of texture.
    σ2=4/π2π/20π/20π/20{w(ψ, θ, φ, )-wRand}2sinθdθdψdφ
    where wRAND is given by the three-dimensional orientation distribution function of randomly oriented polycrystals.
  • 徳岡 辰雄, 楠 秀樹
    1980 年 29 巻 326 号 p. 1122-1127
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    Waves propagating in elastic liquid crystals are investigated theoretically. The materials proposed by Coleman have two-phase properties, that is, fluid-like and solid-like. The liquid crystals are classified into two types, the axial one and the plane one. The axial liquid crystal has an intrinsic axis and it does not respond to the deformations which hold that axis to be invariant, and the plane liquid crystal has an intrinsic plane and it does not respond to the deformations which hold that plane to be invariant. The theory of singular surface is applied to the analysis. The waves which can propagate in the materials are divided into two types, one being the typical longitudinal waves which are similar to the wave in the fluid, and the other the particular transverse waves which reveal the solid-like property of the materials.
  • 小倉 敬二, 大路 清嗣, 島川 貴司, 川端 保弘
    1980 年 29 巻 326 号 p. 1128-1134
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    The fatigue crack growth and the crack closure behaviors of a clad material were examined by using an explosively-bonded brass clad steel plate, in the case when the crack was propagated across the interface of the clad material. The apparent fatigue crack growth behavior of this material was complicated. Both acceleration and retardation were observed near the material interface. Corresponding to these crack growth behaviors, the extremely high and low values of the crack opening ratio, U, were observed. It was found that there was a poor correlation between the crack growth rate and the stress intensity factor range, ΔK. It was concluded that this was mainly due to the residual stresses which had been introduced in the material production process. A good correlation was found between the crack growth rate and the effective range of the stress intensity factor, ΔΔKeff. The result of the finite element analysis on the relation between the residual stress and the crack closure supported the conclusion that the observed complicated crack growth behavior of the clad material was caused by the residual stress.
  • 小寺沢 良一, 森 時彦
    1980 年 29 巻 326 号 p. 1135-1141
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    A critical examination was made on the applicability of fracture mechanics parameters to creep crack propagation rate of 21/4 Cr-1 Mo steel at 565 deg C by using specimens of different dimensions at a high stress level. The crack length, crack propagation rate and fracture mechanics parameters were evaluated through electron fractographs, since it was difficult to measure them optically on a specimen surface due to the small crack opening displacement in such a low ductility material as the one used here. It was found that the modified J-integral J evaluated experimentally was a better parameter that the elastic stress intensity factor K or the net section stress σnet to correlate the creep crack propagation rate for this low ductility material. The necessity of a similar examination with larger specimens at lower stress levels was suggested. Fractographic features concerning with the mechanism of creep crack propagation were briefly described.
  • 北川 正義
    1980 年 29 巻 326 号 p. 1142-1146
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    The effect of temperature on the relation between fracture toughness and slow crack growth rate was investigated for PMMA in the temperature range -30°C to 80°C. Fracture toughness was measured by Gurney's sector method.
    The results obtained are summarized as follows;
    (1) A scaling law rather than an Arrhenius type equation holds between the crack growth rate and the fracture toughness. The exponent of the scaling law is nearly constant over the entire temperature range tested.
    (2) The fracture surfaces associated with slow crack growth are classified into three typical types, i. e., mist surface with few radial lines, mist surface with many radial lines and mirror surface. These typical surfaces are closely related to the crack growth rate and testing temperature.
  • 菊田 米男, 荒木 孝雄, 黒田 敏雄
    1980 年 29 巻 326 号 p. 1147-1153
    発行日: 1980/11/15
    公開日: 2009/06/03
    ジャーナル フリー
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