Limit Loads of Thick-Walled Cylinders with a Fully-Circumferential Crack under Combined Internal Pressure and Axial Tension Based on Slip-Line Field Method

Based on slip-line field method,limit load solutions for thick-walled cylinders without defects and with a fully-circumferential inner crack under combined internal pressure and axial tension are derived,considering the elastic-perfectly-plastic material model.Numerical examples show that the solutions in this paper for the cylinder with inner crack agree well with the results of the elastic perfectly-plastic finite element analysis,and are conservative.For cylinder with inner crack,its limit load solution based on simplified slip-line field is only applicable for the very deep cracks.For other cases,the limit loads based on Mises crite-rion is proposed instead.