抄録
This paper deals with the effect when the coaming plate is an ideal double stiffening plates, that is, we make the displacement at the edge of the hole of orthogonally aeolotropic plate zero. In this case, maximum circumferential stress does not occur at 90°, but at about 45°. Of course, the circumferential stress is smaller than when edge is stiffened with cross bars, or the coaming plate, or the coaming plate having the stiffening plates.
