Find the residual hoop stress at the outer surface of a thick-walled cylinder made of a material with yield strength of 500 MPa, the inner and outer radii of 100 and 150 mm, respectively. The cylinder was initially subjected to the fully plastic pressure and after that the pressure was released.
84 MPa
117 MPa
-67 MPa
- 114 MPa
193 MPa
176 MPa