The contact pretension between the layers of cylindrical structure concerns the non-linearity of geometry and material, as well as the influence of interface friction.
多层圆柱结构的接触预紧问题，涉及到几何非线性和材料非线性以及接触面上摩擦力的影响。
2
The inertia friction welding process is a non-linear process because of the interaction between temperature field and material properties as well as friction force and thrust force.
焊接过程中的温度、材料热物性、摩擦力和顶锻压力的相互作用使焊接过程高度非线性。
3
It is an amorphous surface after the catalytic that is basically in the flat state, with lubrication, so the friction coefficient is small, good non-adhesion function.