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Dish-shaped head is also known as a hem-shaped spherical head, it consists of a spherical surface, a straight side of a cylinder of a certain height, and a transition portion connecting the above two portions with a radius of curvature smaller than the radius of the spherical surface. The dish-shaped head is a continuous curved surface. At the three-part joint, the curvature radius of the warp is abrupt, and there is a bending stress due to the curvature change. The result of the superposition of bending stress and tensile stress causes the stress of this part to protrude from other parts.