Investigation of Cyclic Behavior of SS316L Cubic Shells under Pure Torsional Load

In in this paper, cyclic behavior of SS316L cubic shells under pure torsional load was experimentally and numerically studied. Experimental tests were carried out by a servo-hydraulic NSTRON 8802 machine under torsional load-control condition. In this loading condition and based on experimental results, due to the existence of larger shear stress along the shell thickness, increasing of torsional torque amplitude caused the enhancement of ratcheting angle and reduction of shells’s life. Also, the effect of cutout and its size on ratcheting behavior of cubic shell were investigated , According to experimental results, it was seen that the sensitivity of ratcheting angle to cutout position near the applied load was high and the shell’s life decreases in this condition. Numerical analysis was done by Abaqus software and using the nonlinear isotropic/kinematic hardening model. There is a good agreement with that of experimental results.