THE INSTITUTE OF SCIENCE AND TECHNOLOGY UNIVERSITY OF TOKYO
THE INSTITUTE OF SCIENCE AND TECHNOLOGY UNIVERSITY OF TOKYO
THE INSTITUTE OF SCIENCE AND TECHNOLOGY UNIVERSITY OF TOKYO
出版者
東京大学理工学研究所
雑誌名
東京大學理工學研究所報告
巻
12
号
3
ページ
49 - 62
発行年
1958-02-28
抄録（英）
Three kinds of graphite products, two non-permeative graphite (F and S) and one ordinary graphite (E), were tested under compression, bending and wedge indentation at various temperature. The specimens were tested in a bath filled with cooled alcohol or heated soya-bean oil, and the test temperature was regulated between -50℃ and 200℃. Under low temperature, the compressive strength σ_c of F and S is mainly governed by critical tensile stress σ_0, which is assumed to be equal to σ_0/1.5, and σ_b is the strength obtained from the bending tests. Under higher temperature, on the other hand, σ_c of these two products is governed by critical shearing stress τ_0. The fractured surfaces of these two products show brittle appearance under low temperature, but as temperature rises they tend to show ductile appearance. The wedge indentation strength σ_s, shows nearly equal tendency as σ_c, but the bending strength σ_b under higher temperature considerably differs from τ_0 in its temperature gradient. The critical tensile stress σ_0 and the critical shearing stress τ_0 are expressed as follows: σ_0=Ae^<S/T> τ_0=Be^<U/T> (S>U) where A, B, S, U are material constants and T is absolute temperature. Material E shows no temperature effect up to 200℃, and always shows brittle fracture.
黒鉛製品の破壊に対する温度影響について
SA1511780.pdf
(1.96MB)
