Low-Cycle Fatigue Life Analyzed by Parameter Method for Various High Temperature Materials

Abstract

Low-cycle fatigue life for various kinds of high temperature materials has been analyzed by a modified Larson-Miller parameter. written by P = T (logN₂₅ Alogε + B) where T is temperature, N₂₅ is fatigue life under symmetrical strain wave shapes, ε is strain rate, and A and B are constants. Test data used in the analysis are from NRIM Fatigue Data Sheets of popular engineering materials of nine kinds, ten heats including carbonsteel to Fe-base super alloy. The results have been compared between the materials and compared with statistical analysis results adopted in a design code.