坒

角变形或其他几何缺陷的存在，造成膜应力和剪应力沿着器坒而变化。

The presence of angular distortion or other types of geometric defects causes the membrane stress and shear stress to vary along the wall .

对园柱形模型平衡的分析，说明如膜应力和剪应力在容器坒内为常数，容器的形状必然是完整的园柱形而没有任何几何缺陷。

Considering the equilibrium of a cylindrical mode , the analysis shows that when the membrane stress and the transverse shear stress are constants along the shell , the form of the vessel must be exactly cylindrical without any geometric defects .