过盈连接部件在旋转弯曲载荷下，易于在接触区域产生微动损伤，降低构件的使用寿命。
The shrink-fit components usually suffer fretting damage in the contact surface under rotating bending load, which remarkably reduce the life of the components.
牵引梁为薄壁、内空箱体整体铸造构件，铸件容易出现搓扭和弯曲无规律性变形。
F draft sill is an integrated casting component with thin wall and inner empty box, and irregular deformations like torsion and bending occur easily.
在工程构件中，最常见的变形形式是弯曲变形和弯扭组合变形。
In structural members, the deformation is usually caused by bending or by a combination of bending and torsion.
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