Elliptical head

Elliptical head

What is the characteristic of the stress of an elliptical head

The elliptical head and butterfly head are respectively from the elliptical shell and the butterfly shell with the height of the head.

H

The straight edge of the cylinder is made up. The connection point of the elliptical shell to the cylindrical shell of the straight edge, the large in the butterfly shell

R

Spherical shell and straight edge cylindrical shell and small,

-

The connection points of transition arc surfaces are all connected by different curvature shells, forming a sudden change in geometrical size. Therefore, the edge stresses near these connections will be generated. Under the action of internal pressure, there is not only the overall film stress but also the edge stress near the junction point and its vicinity. Therefore, the actual stress in the head can not be simply the thin film stress, but the sum of the total membrane stress, the local edge film stress and the edge bending stress. This is called the comprehensive stress.