材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
18 巻 , 194 号
選択された号の論文の13件中1~13を表示しています
  • 松尾 哲夫
    1969 年 18 巻 194 号 p. 951-960
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
  • 峰松 陽一
    1969 年 18 巻 194 号 p. 961-964
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    A simple pyranometer for use in the artificially accelerated weathering apparatus was constructed. It can measure and record the total irradiance on the specimen. The irradiance detector was made of two platinum pieces (Each 5×3×0.03mm), one being Pt-blackened and the other Aldeposited, and a CA differentia thermocouple (0.1mmφ) was attached to these pieces.
    The time to reach one half of equilibrium emf value was about 3.0sec. The emf of differential thermocouple in the accelerated weathering apparatus of 6kW water cooled xenon lamp (ASTM E 239 type) was about 0.7mV. The relation between the emf of differential thermocouple and the irradiance on the detector may be calibrated against a commercial calibrated pyranometer.
  • 西畑 三樹男, 熊倉 保夫, 実 博司
    1969 年 18 巻 194 号 p. 965-969
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    In this paper we deal with Cu-Ni-Si alloy to obtain an excellent anti-corrosive thin plate spring for communication apparatus, and describe the results of the experiment on the effects of cold working and precipitation hardening on mechanical properties and anti-corrosion, we conclude from the experiment described above that.
    (1) There is increase in the tensile strength, yield strength, spring limit, Vicker's hardness, fatigue strength and elongation of Cu-Ni-Si alloy, as the result of 500∼600°C precipitation treatment. They present more excellent results than in Nickel Silver alloy. There is no change presented in Young's modulus after the heat treatment.
    (2) Copper-Nickel-Silicon alloy develops no stress corrosion cracking, differing from Nickel-Silver and Brass, and its anti-corrossivity is for better.
  • 田中 真一, 初野 耕三, 夏井 由郎, 中村 宏
    1969 年 18 巻 194 号 p. 970-975
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    Studies have been made of the fatigue strength of the tufftrided steel which is widely used as structural material of machine parts,
    The material of the specimens used in the present experiment is SFA 55 carbon steel, and the forms of tested specimens are 20mmφ smooth specimen and 15mmφ V-notched specimen (notch radius is 0.3, 0.6, and 1.0mm). The heat-treatments of specimens are of three kinds, i. e; tufftrided and water-cooled, tufftrided and air-cooled, neutralized heat-treatment and water-cooled.
    Further, the residual stress of the specimen near the surface was measured by means of an X-ray stress measurement apparatus.
    The test results are as follows;
    (1) The fatigue limit of the tufftrided smooth specimen is about 40 percent higher than that of the non-tufftrided one.
    (2) In the case of the sharp V-notched specimen, the fatigue limit of the tufftrided specimen is about twice the fatigue limit of the non-tufftrided one. But, under the condition of cooling treatment after heat-treatment, the fatigue limit falls considerably and becomes smaller than the value of σw0/α.
    (3) The effective hardened layer of the tufftrided specimen is about 2 to 3mm.
    (4) The residual stress near the surface of the tufftrided specimens is about-40kg/mm2. The 70 to 75% of its value has been caused by the cooling treatment. The residual stress caused by the combinated layer or the diffusion layer is about -10kg/mm2.
  • 篠田 哲守, 佐々木 良一
    1969 年 18 巻 194 号 p. 976-982
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    Although it is important from the practical standpoint to study the effect of the initial stress of practical heat resisting steel on its stress relaxation properties, and to find thereby the phenomenological correlation between its initial stress and residual stress, it is regrettable that no systematic investigation on this problem has so far been made beyond Oding's works, Report is made in this paper of the examination made of the effect of the initial stress of 1 Cr-1/2 Mo-1/4V steel on its residual stress based on Oding's rule by varying the initial stress within the temperature range of 450∼550°C. The temperature dependence of stress relaxation rate was also discussed here.
    The results obtained are as follows;
    (1) The initial stress in the lower temperature range gives effect of different order on the residual stress from the effect that will be given by the initial stress in the higher temperature range. The relaxation behavior of the residual stress may even be greater when the initial stress was in the lower temperature range than what might have been expected from the property of the initial stress which was in the higher temperature range.
    (2) Accordingly the so-called Oding's correlation between σ0 and Δσ(=σ0t) fails in this kind of low alloy steels, but is possible of success in the kinds of high chromium ferritic and austenitic steels.
    (3) The temperature dependence of stress relaxation rate εrp for the data with same initial strain 0.15% within the temperature range of 450-550°C is represented experimentally as follows.
    εrp=-1/E·dσ/dt={1.41×10-13σ21.0exp[-9.40×104/RT]……18_??_σ_??_22 2.51×10-27σ31.8exp[-(9.25σ-13.9)×103/RT]……10_??_σ_??_18
    where, σ; stress (kg/mm2), R; gas constant (cal/mole/deg), and T; test temperature (°K).
  • 木村 博光, 岩村 匡郎
    1969 年 18 巻 194 号 p. 983-989
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    For the purpose of selecting materials for manufacture of electrode connector in the electron tube, Ni, Ni-Mn, Ni-Cr, Ni-Fe and Ni plated Fe were examined with respect to their embrittlement by annealing them in city coal gas, to the embrittlement of the stem lead wire in the stem making process, to the decrease in insulation resistance of inter-electrodes during their life, and to the fatigue of the cathode tab in the inverted pinched cathode due to the on-off cycling test.
    The results are summarized as follows;
    (1) Embrittlement by city coal gas firing can be evaluated by measurement of tensile strength and elongation. Embrittled Ni has low tensile strength and elongation, and its metallographic structure shows micro cracks formed along the grain boundaries.
    (2) Embrittlement and fracture of Ni stem lead and Ni cathode tab was caused by city coal gas firing in stem making process and in glass envelope sealing-in process. Metallographic structures of the embrittled lead wire and tab showed also micro cracks along the grain boundaries.
    (3) Ni-Mn, when used as cathode tab, decreased in insulation resistance of inter-electrodes during its life. But it was not the case with Ni, Ni-Cr, Ni-Fe and Ni plated Fe.
    (4) Ni plated Ni-Fe is recommended for the stem lead wire, because it is not embrittled and hardened by city coal gas firing, nor is it oxidized in the stem making process, nor does it wet glass.
    (5) 42% Ni-Fe is recommended for the cathode tab material, because it is not embrittled by city coal gas firing, nor does it decrease in insulation resistance of inter-electrodes, and it is strong resistant to fatigue.
  • 正脇 謙次, 高村 正治, 小島 公平
    1969 年 18 巻 194 号 p. 990-996
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    It is known that lattice defects are introduced in the specimen of metallic material by cold stretching, which results in the change in electrical resistivity. The increase Δρ/ρ of the resistivity is usually represented in terms of strain ε by
    Δρ/ρ=Aεn,
    where A and n are constants depending on the various conditions of the specimen.
    In order to study the effect of the grain size and the prior deformation on the change in resistivity, 99.998% aluminium wires were deformed in tension at the liquid nitrogen temperature. Three groupes of specimens having the grain size of about 18, 80 and 800μm were provided after annealing them in vacua for 2hrs at 200, 300 and 500°C, respectively.
    The results obtained are as follows;
    (1) The constants n and A in the above equation increase from 1.27 to 1.84 and from 0.1 to 0.55, respectively, with increase in grain size.
    (2) Similar emprical equation is valid for the specimen pre-stretched at 15°C, where the constants n and A depend on the amount of pre-strain.
    (3) The square root (Δρ/ρ)1/2 of the increase of resistivity at -196°C is proportional to the applied tensile stress σ. The gradient of the (Δρ/ρ)1/2/σ relation increases from 0.049 to 0.059mm2/kg with the increases of the grain size.
    (4) The relation between Δρ/ρ and d is represented by
    (Δρ/ρ)1/2=P+Qd-1/2,
    where P and Q are constants, and d is the grain size.
    (5) Nearly 60% of the total change in resistivity by cold stretching is attributed to the presence of point defects. The ratio is almost the same standing regardless of the grain size or of the amount of pre-strain.
  • 坂本 芳一
    1969 年 18 巻 194 号 p. 997-1003
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    In the previous papers it was found that the macro stress, the micro strain and the coherently diffracting domain size in chromium, electrodeposited from chromic acid plating bath, depended strongly on the plating bath temperature.
    In the experiment reported in the present paper, it was intended to study the method how to separate simultaneously the macro stress, the micro strain and the domain size in electrodeposited chromium obtained at various bath temperatures by using the Fourier series method suggested by Schmidt. The X-ray diffraction line profiles measured by the Sin2ψ method were expanded to the Fourier series. From the phase angles of the complex Fourier coefficients, the macro stress were obtained and at the same time the micro strain and the domain size were obtained by the Fourier cosine coefficients. The experimental results obtained are summarized as follows.
    (1) The simultaneous separation of the macro stress, the micro strain and the domain size in the electrodeposited chromium, is confirmed to be possible by the Fourier series method.
    (2) It is found that the value of macro stress obtained by the Fourier series method have good agreement with those obtained by the three points parabola fitting method within the experimental errors, and no marked difference has been recognized in the value of the macro stress, when the diffraction line profiles at various angles ψ are corrected to remove the defocussing and absorption effects by the convolution method.
    The macro stresses in the electrodeposited chromium measured by the Fourier series method on the (211) diffraction line profiles of CrKα radiation are tensile in the bath temperature range of 40 to 65°C, and the stresses have decreased with increasing bath temperature and above 70°C, the stresses are compressive.
    (3) It is found that the r.m.s strains obtained from the (211) reflection of ψ=0°decrease with increasing bath temperature in the range of 40 to 70°C, and again increase at 75°C. The domain size are found to increase with increasing bath temperature in the range of 40 to 70°C, and again. decrease at 75°C.
  • 矢島 聖使, 平井 敏雄, 青木 興一
    1969 年 18 巻 194 号 p. 1004-1009
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    Investigations have been made on the thermal expansion behavior in the c-direction of pyrolytic graphite bromine residual compounds (PG (Br), 0.9∼5.5 weight percent bromine) within the temperature range of 20∼1000°C. The thermal expansion consists of three stages: the first stage below about 120°C, the second stage 120∼300°C, and the third stage above about 300°C. The thermal expansion coefficient in the third stage increases linearly with the amount of bromine. The expansion under heating-cooling cycles shows a thermal hysteresis which relates to the existence of bromine. The observed behavior is explained, using a model which considers the bromine to be ionically bonded to carbon near room temperature (1st stage) and to vaporize with increasing temperatures to make gaseous bubbles within the lamellar structure of the graphite crystal (2nd stage). After 2nd stage PG(Br) expands according to the ideal gas law (3rd stage). The calculation of the thermal expansion coefficients is based on the Griffith's crack model employed by Martin and Brocklehurst. The experimental results are in good agreement with the calculated values.
  • 大石 不二夫, 加藤 明
    1969 年 18 巻 194 号 p. 1010-1014
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    Degradation of polystyrene caused by dynamic fatigue combined with irradiation of ultraviolet rays is here under reported.
    The fatigue behavior during the fatigue test, i. e. the dynamic deflection and temperature rises of the specimens, were also observed with the method as was reported in the previous paper.3) The degradation was determined by infrared and ultraviolet spectroscopy, X-ray diffraction, differential thermal analysis, thermogravimetric analysis and solution viscosity. The fatigue testing machine used here was the modified one of ASTM D-671-63T method B. The specimens were made of G. P. grade polystyrene by injection for the ASTM type. The condition of the sample prepapation are as follows: original, irradiation only of ultraviolet rays (48, 167hrs), fatigue only (48, 167hrs), irradiation (48, 167hrs) followed by fatigue (48, 167hrs) and irradiating fatigue (48, 167hrs), their alternating loads being 2.5kg for 48hrs and 1.6kg for 167hrs.
    The results of the experiment show that for G. P. polystyrene, the degradation caused by the dynamic fatigue and the irradiation of ultraviolet rays are not remarkable, though photo-oxidation is observed in the case of polystyrene film, and so the photo-degradation may be limited to the specimen surface. As to the fatigue behavior of polystyrene, the dynamic deflection change was small and this phenomenon agrees with the small degradation observed in the present experiment.
  • 中川 有三, 杉田 博彦
    1969 年 18 巻 194 号 p. 1015-1018
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    The testing apparatus was provided with a spring set tandem to the specimen of unplastic polyvinyl chloride so to be worked as to have constant strain at constant temperature, and in the process of recovering from the strain incurred during the reheating of the specimen we tried to separate the permanent strain from the elastic strain, which was produced by the spring force, and tried to obtain approximate value of the modulus of elasticity during the repeating process of the material. But in view of the fact that in our experiment it is very hard to measure the elastic strain directly and exactly, we determined to be content with approximate value of the modulus under the following assumption.
    That the difference between the strain release under the spring load at three minutes of initiation of measurement and the strain release under no load, i. e. the strain as it stood at the time of three minutes of measurement, would constitute the total elastic strain by which the modulus of elasticity was to be calculated. Assuming that the value of modulus of elasticity is constant during the process of recovering from the strain, we calculated not only the elastic strain, but also the corresponding permanent strain.
    The result of our experiment indicates the fact that the greater the spring constant is, the greater the value of suppressed permanent strain is at any repeating temperature.
  • 西松 裕一, 山口 梅太郎, 本杉 啓介, 森田 道明
    1969 年 18 巻 194 号 p. 1019-1025
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
    The dispersion of the measured value of the strength of rock consists of its“inherent”dispersion and the experimental error. The former is caused by the statistical distribution of the socalled Griffith cracks, and the latter can be accompanied with any kind of the measurement.
    In order to estimate the amount of the“inherent”dispersion, the uniaxial compressive and tensile strength of various sizes of the test piece are to be measured, and Weibull's coefficient of the uniformity is to be estimated.
    Using the estimated value of Weibull's coefficient of the uniformity, the value of the“inherent” dispersion and the experimental error is to be calculated.
    From the observation and culculation, it is concluded as follows;
    (1) The value of Weibull's coefficient of the uniformity of the uniaxial compressive strength does not differ much from that of the uniaxial tensile strength, as suggested by the theoretical consideration.
    (2) In the standerd testing method of the strength of rock in the present days, the experimental error up to several percents can not be avoided.
    (3) The accuracy of the uniaxial tension test is less inferior than that of the uniaxial compression test.
  • 井上 達雄
    1969 年 18 巻 194 号 p. 1026-1031
    発行日: 1969/11/15
    公開日: 2009/06/03
    ジャーナル フリー
feedback
Top