Abstract
Tests of fatigue crack propagation from pre-crack under mixed mode loading were performed on S45C thin-walled tubular specimens. For a circumference through crack in thin-walled tubuler specimen, tension and tortion loadings correspond to mode I and mode II loads, respectively. Test results with cyclic torsion and static tension were compered to test results only with cyclic torsion. Crack propagation behavior, threshold condition, and the cruck propagation direction were discussed.
