Abstract: 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. And the equation was compared with the load capacity equation traditionally with the assumption that all of the contact asperities have elastic deformation. The results showed that, the load capacity of contact asperities can be calculated with the assumption that all of the contact asperities have elastic deformation in the middle or later running-in stage when h/σ>0.5andψ<0.9 . While at the initial running-in stage when h/σ<0.5andψ >0.9, the load capacity of contact asperities with the assumption that all of the contact asperities had elastic deformation was about 50%-85% of the situation that the contact asperities had elastic as well as plastic deformation. In the light of the importance of the initial stage during running-in for Piston ring-cylinder liner, the load capacity of elastic deformation and Plastic deformation asperities should be studied independently when calculated the load capacity of asperities, which showed that the established equation could be more accurate for tribological conditions analysis of Piston ring-cyhnder hner during running-in.

Key words: running-in, load capacity of asperities, cylinder liner, piston ring

Author: Zhu Hua, Power Department, School of Mechanical Engineering, China University of Mining and Technology, Xuzhou 221116, China

E-mail: hzhu@cumt.edu.cn

Tribology, Vol. 29, Issue 6, 2009, 559~563