熱疲労寿命を高温疲労データによって推定する一つの方法(<小特集>高温強度小特集)

概要

論文の詳細を見る
Thermal and isothermal fatigue tests were conducted on two typical types of steels, 0.16% carbon steel (S15C) and 18 Cr-12 Ni-Nb austenite steel (SUS 347). The difficulties which in the past have prevented thermal fatigue data from being fully appreciated, such as a non-flat temperature profile along the gage section of a specimen. roughness of the inner surface of a thin walled cylindrical specimen, and imperfect synchronization between temperature and strain. were almost overcome in the fatigue tests. Effects of both mean temperature T_m and temperature range ΔT on thermal fatigue life were examined. The thermal fatigue life was compared with the isothermal fatigue life. It was found that the change of temperature during a strain cycle between the maximum temperature T_2 and the minimum temperature T_1 played an important role in crack growth when the mechanical properties at T_2 were different from those at T_1. A method was proposed to predict the thermal fatigue life based on the isothermal fatigue test results.
社団法人日本材料学会の論文
1974-03-15