Abstract
This paper suggested a more precise life prediction method of bellows type expansion joint made from SUS304. For this purpose, elasto-plastic analysis by finite element method (FEM) was used and Manson-Coffin law was adopted as a low-cycle fatigue life formula. Coefficients of Manson-Coffin law were calculated from date of tensile experiments, and 3 type formulas with different heat treatment were obtained. Fatigue life was predicted by substituting equivalent plastic strain amplitude and equivalent elastic strain amplitude calculated by FEM to these formulas, and compared with the result of fatigue experiments under displacement control.
