dished head

dished head

The disc head, also known as a folded edge spherical head, is also known as a butterfly head. The curvature radius of a cylinder with a spherical surface, a certain height and the radius of the above two parts is less than the radius of the spherical surface. The disc head is a continuous curved surface. At the three part of the connection, the radius of the curvature of the meridian has a sudden change, because of the change of curvature,

Therefore, there is a bending stress. The result of the superposition of the bending stress and the tensile stress, which makes the stress of this part out of the other parts