一、封头设想碟形封头经线如图1所示,由直线、园弧及组成,为直边,为折边,为球面。碟形封头的最大缺点是:在直边与折边、折边与球面的联接处,壳体中的应力与变形不连续,有较大的边缘应力。这也是现行各类凸形封头共有的缺点,力学分析表明,这是由于结构的不连续引起的。 First, the head envisaged Dish-shaped head warp as shown in Figure 1, from the straight line, garden arc and composition, as a straight edge, for the hem, spherical. The biggest disadvantage of the dish-shaped head is that the stress and deformation in the shell are not continuous at the connection between the straight edge and the hems, the hems and the spherical surface, and the larger the edge stress is. This is also the common shortcomings of the current types of convex head, mechanical analysis shows that this is due to the structure of the discontinuities caused.