Load sequence effects on fatigue crack growth in notched tubular specimens subjected to axial and torsion loadings

Fatigue crack growth behavior of tubular specimens with a through thickness circular hole made of a carbon steel subjected to axial and torsional loads was investigate. Loading sequence effect on crack growth rate was also studied by alternating between axial and torsion cycles in a loading block. Mode I crack growth was observed. Torsion fatigue crack growth lives were shorter and crack growth rates were higher than for axial loading. This is...