A study of fatigue data by using weibull analysis in a dual-phase steel prestrained by cold rolling

Abstract

In this paper was used a dual-phase steel with ferrite and martensite microstructures. This steel was pre-deformed by cold-rolling with 30% pre-deformation. For each condition (0% and 30% prestrain) was determined the fatigue test curves with 17 tension levels and 5 specimens for each level. After that the results were treated by using Weibull distribution with 3 tension levels. It was determined that by using 3 tension levels and 5 specimens for each level, the fatigue curves presented 90% reliability.