Cross section pictures of the square specimens under torsional cyclic loads with longitudinal initial crack

The response of the materials under the action of cyclic loads is always a topic of interest of the engineers and researchers. In this dataset is showed the results for the torsional fatigue test of the square cross section specimens. A longitudinal crack was induced in one face. The specimen material is AISI 1015 steel. Fatigue test was realized in the torsional testing machine described in the literature. The asymmetry ratio used was -1. It is showed the crack size ai respect to the number of cycles Ni and pictures of the cross section after the failure.