113 On Shap-Through Buckling of Reverse Safety Rupture Discs and Influence of Residual Stress on it

Abstract

In safety valve of pressure vessel, reverse safety rupture discs have been in use. They make use of snap-through buckling of partial spherical shell. Especially, bulging method has the advantage of simple forming in production. The buckling pressure of a partial spherical shell with a flange formed by this method is much lower than one of partial spherical shell without a flange obtained by buckling. Therefore, it is very difficult to predict it in safety rupture discs. In this study, static experiments and finite element analyses were carried out and results concluded that the residual stresses locally developed in plastic forming much the buckling pressure much lower.