Effect of Transitional Radius on Strength of Forged Flat Head

The effect of transitional radius on the strength of forged flat head are studied by finite element method(FEM),25 example pressure vessels with different diameter and design pressure are selected as the computation example.The symmetric FEM models are created,and the stress intensity distribution was obtained.The strength of the forged flat head was evaluated according to the analysis design criteria.The head strength was analyzed based on different transitional radius values of GB 150、ASME and JIS standards.The results show that it is conservative when the transitional radius value is decided by GB 150,it can also meet the demand of analysis design standards when the transitional radius value is decided by ASME or JIS,but there is the less spare safety.