在圆筒形压力容器中,由薄膜理论得出:圆筒上的环向应力应为轴向应力的二倍,因此环向应力是主应力,对压力容器的破坏危害大。在压力容器爆炸试验中,如对子钢制高压无缝气瓶,每500只气瓶要作一只爆破试验,从试验的结果来看,绝大部分气瓶的爆破断口如图1所示,即爆破口位于筒体的轴向,验证了薄膜理论的正确性。 In the cylindrical pressure vessel, the theory of the film shows that the hoop stress on the cylinder should be twice that of the axial stress, so the hoop stress is the principal stress, which is harmful to the destruction of the pressure vessel. In the pressure vessel explosion test, such as high-pressure seamless steel gas cylinder, every 500 gas cylinders to make a blasting test, from the test results, the vast majority of gas explosion blasting shown in Figure 1 , That blasting mouth located in the axial direction of the cylinder to verify the correctness of the theory of the film.