a closed ended thick cylinder has the following dimensions which are internal radius is 0.1m and the external radius is 0.15m. the cylinder is subjected to an external pressure of Po=22MPa and an internal pressure of Pi. if the cylinder is designed according to the Tresca yield criterion, calculated the internal pressure Pi. the cylinder is made from steel where yield stress= 240 MPa and v=0.3. Subsequently sketch the hoop and radial stresses in the wall of the cylinder.