The internal forces of a vessel with disc heads are colcuated using MWR,and the collapse load of the vessel can be obtained by satisfing the connection conditions of the vessel.

• 蝶形封头的压力容器具有广泛的工程应用。本文将其视为不同厚度的组合，采用加权残值法分析了各部分壳件的内力场，并计算了极限内压，得到一个简单的表达式。