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.

The results show that experiments are accordant with numerical simulation and when the preparatory hole is reverse-conical and its mean diameter is 11 mm,acceptable nozzle sizes can be obtained after hole flanging on thick-wall cylinders.

Influence of the workpiece s pre-hole diameters and passes on thick-wall cylinders hole flanging is investigated by experiment and numerical simulation.

A hydraulic method for determining incipient yield pressure of thick wall cylinder;

This paper performs the limit analysis of a thick wall cylinder of linear strengthened material based on the unified strength theory.

Using elastic solution of thick wall cylinder, it is analyzed that the optimum design on three-layers assembled cavity die of cold extrusion under the elastic limit stress.

Reliability assessment and design of thick-walled cylinder under internal pressure;

Calculation of stress intensity factor about a thick-walled cylinder with an surface crack under autofrettage stresses;

The preloads distribution of the die s quasi thick-walled cylinder pre-tensional structure was gotten subjected to the changing of k,which was the ratio of the die s height to its diameter,in .