A strain rate ratio approach for assessing creep-fatigue life of 63Sn-37Pb solder under shear loading

This paper studies creep-fatigue life prediction under shear loading by making extensive torsion creep-fatigue experiments using four kinds of strain waves. The linear damage rule, the strain range partitioning method, the frequency modified fatigue life and the ductility exhaustion model were applied to the experimental data, but no methods accurately predicted the creep-fatigue life. A new method based on the strain rate ratio, which predicted the creep-fatigue life within a factor of 4 scatter band, was developed.