At the same time, the rule of the stress intensity factors in the temperature stress of thick wall shells with the change of crack depths is obtained.

This paper aims at to the internal defect feature of the barrel with different thickness,has made ultrasonic board wave detection method,has designed online testing system,analyses and handles for defect data,batch experiment proves that this kind of method suits the online nondestructive detection of a large quantity of the barrel.

Based on the theory of the material unable to sustain comperssive strength and by means of the deformation theory, the thick sphere shellsa are reresearched.

This paper makes the Autofrettage analysis of thick wall spherical shell of linear strength material based on unified strength theory.

This paper presents a new method to calculate the limit load of thick wall cylinder and thick wall spherical shell based on Yus Unified Strength Theory and a Unified solutions are obtained.