In order to compute the load capacity of asperities for piston ring-cylinder liner in internal combustion engine at running-in stage,the load capacity equation of asperities,including load capacity of elastic deformation and plastic deformation asperities,was derived from the contact model of rough surfaces.

Based on the assumptions that the particle is round or hexagonal and the asperity contour is round or cosinoidal,the rubbing temperature of the particle on the asperity is studied as well as its effect on the temperature and pressure properties of the liquid.

A model was developed which used a discretiza- tion method to obtain the asperity height and deformation mode.

The friction,friction coefficient etc of prescind from external asperity model and the single asperity model in plasticity forming were respectively researched by using finite element analysis software ADINA and Coulomb friction model and nonlocal friction model.

Then according to the bearing behavior of arcade tunnel,the internal force of one side bearing and both sides bearing have been calculated and analyzed by using the method of loading-structure.