Study on Creep-Fatigue Life Prediction Using Simple High Temperature Low Cycle Fatigue Testing Machines

摘要

The authors developed a simple high temperature low cycle fatigue testing machine for long time creep-fatigue tests and carried out experiments on two kinds of CrMoV steel forgings and 304 stainless steel. The experimental results indicate: (1) The data obtained by long hold time tests deviate remarkably from the linear damage fraction rule. (2) Creep rupture ductility seems to be one of important factors for creep-fatigue life after long time. (3) In the case of materials the creep rupture ductility of which makes a remarkable change with time, S.S. Manson's diagram may not become a single line.