外压圆筒, 自增强, 弹塑性应力, 承载能力

The basic theory on autofrettage of external pressure cylinders was established on the basis of the analytic solutions of elastic-plastic stresses of an external pressure cylinders derived herein according to Tresca yield criterion and then proposed a design calculation method for the external pressure vessels. It is also shown that although the elastic and the elastic-plastic stresses of the external pressure cylinders are different from those of the internal pressure cylinders and their residual stresses after removing autofrettage pressure also differ from each other, the equivalent stress of residual stresses, the equivalent stress of the elastic stresses caused by operation pressure, the equivalent stress of the total stresses and the equivalent stress of the elastic-plastic stresses of the external pressure cylinders coincide with those of the internal pressure cylinders.Thus the solutions to the autofrettage of external pressure cylinders are identical with those to the autofrettage of the internal pressure cylinders.