巻号一覧
1964 巻 (1964)
- 40 号 p. 2-
- 39 号 p. 3-
- 38 号 p. 3-
- 37 号 p. 2-
1964 巻, 38 号
選択された号の論文の8件中1～8を表示しています
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荘司 信守1964 年 1964 巻 38 号 p. 3-5
発行日: 1964/06/25
公開日: 2010/06/28
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中原 乾二1964 年 1964 巻 38 号 p. 6-8
発行日: 1964/06/25
公開日: 2010/06/28
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斎藤 充弘, 都竹 卓郎1964 年 1964 巻 38 号 p. 9-14
発行日: 1964/06/25
公開日: 2010/06/28
ジャーナル フリーBy means of an electromagnetic driving and detection technique, the effects of fatigue by cyclic straining on the low-amplitude internal friction (Q-1) as well as the dynamic modulus (E) of the two typical carbon solids, i.e. glassy hard carbon and polycrystalline graphite, have been investigated.
The glassy carbon specimens heat treated (HT) at 1000°C indicated very short life in the fatigue test, i. e., failed at about 6.5×105 cycles of straining (N) to the amplitude level of 4.5×10-4, while it looks apparently excellent in the relaxation characters, having high Q-1 and low E. In view of its high electric resistivity observed beside, such a discrepancy is concluded to come from the presence of viscoelastic organic impurities dispersed rather inhomogeneously in the texture. The 2000°C HT specimen survived the 1000°C HT one by factor of about eleven, after indicating a peak of Q-1-N curve arround N=5×105 cycles on the ordinate. The 3000°C HT epecimen was most stable never failed even after 8×107 cycle strainings.
The fatigue test for polycrystalline graphite specimens was performed at four different levels of straining amplitude from 1.2×10-4 up to 2×10-3. The character changes due to fatigue, increase of Q-1 and decline of E, were generally enhanced by raising the amplitude level. The Q-1-N curve for the level of 1.0×10-3 exhibited a peak at the nearly same position as that observed for the 2000°C HT glassy carbon.
It is pointed out that in every specimen the character changes occured mostly in the initial stage of fatigue. Brief discussions in terms of the dislocation theory are given.抄録全体を表示PDF形式でダウンロード (894K) -
無煙炭の熱分解 (I)久保田 精司1964 年 1964 巻 38 号 p. 14-19
発行日: 1964/06/25
公開日: 2010/06/28
ジャーナル フリーIn order to obtain high quality carbon powders for telephone transmitter, studies are carried out on various properties of carbon powders obtained by thermal decomposition at various temperatures in the range 700°C-1150°C in an atmosphere of nitrogen. The decomposition rate increase rapidly above 600°C, liberating large amounts of various gases, and decreases gradually above 800°C. The gases liberated at 600°C are found to be H2, N2, CH4, CO, etc. The content of H2 increasee greatly with the roasting temperature. The static resistance, response, distribution in particle size, effective area, amount of water absorbed, threshold temperature of firing and effects of mechanical and electrical shocks are studied on the carbon powders obtained at various roasting temperatures. It is found that these properties can be controlled by adjusting the roasting temperature and that the higher the temperature the more stable are the carbon powders. Textures of these powders are observed by means of electron microscope.抄録全体を表示PDF形式でダウンロード (4199K) -
佐藤 千之助1964 年 1964 巻 38 号 p. 20-29
発行日: 1964/06/25
公開日: 2010/06/28
ジャーナル フリー本論文は脆性材料の破壊理論についてのGriffithの説にもとずく破壊の確率論を黒鉛材料に応用し, この材料の機械的強度に関する統一的な説明を与えようとしたものである。例えば制された黒鉛の曲げ強度試験において断面形状, 寸法負荷の方法についてなされた一連の結果を統計学的に整理し, その結果をもとにして, 別の種類の強度, 実験;断面形状, 負荷の種類および寸法効果の諸問題に対して適用できることの理論的根拠を示し, それを実験的に検討したものである。JIS現規格において特に指定の不明確であった断面形状をどちらかに統一するか, またはその形状を明記することを提案した。最後に黒鉛の機械的強度試験における寸法効果を検討し試料体積の均一性係数mの逆数乗に反比例することを示し, 実際の黒鉛構造部材へのScale-upに適用されることを明らかにした。抄録全体を表示PDF形式でダウンロード (1349K) -
岸上 弘, 水島 三知1964 年 1964 巻 38 号 p. 29-33
発行日: 1964/06/25
公開日: 2010/06/28
ジャーナル フリーNumerical calculation has been done by means of an analogue computer to solve a non-linear partial differential equation and to obtain transient temperature distribution for the case of a graphite circular disk at the center of which heat is supplied at some given rate. It was shown to be possible to compute the distribution of temperature even when the specific heat and the thermal conductivity are functions of temperature. From the result of temperature computation thermal stresses in the disk were calculated-which are induced by the inhomogeneous temperature. In a typical case it was found that the dependence of the stress upon the position and time is quite different in the non-linear case, where the physical properties of carbon are taken to be functions of temperature, from the linear case.抄録全体を表示PDF形式でダウンロード (643K) -
1964 年 1964 巻 38 号 p. 34
発行日: 1964年
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (127K) -
1964 年 1964 巻 38 号 p. 40
発行日: 1964年
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (88K)
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