3Hartnett M J, Kannel J W. Contact Stresses Between Elastic Cylinders: A Comprehensive Theoretical and Experimental Approach [ J 1. Journal of Lubrication Technology, 1981, 103: 40-45.
4Pereira Candida M, Ramalho Amilcar L, Ambr6si Jorge A . A Critical Overview of Internal and External Cylin- der Contact Force Models [ J ]. Nonlinear Dynamics, 2011, 63:681 -697.
5Johnson K L. Contact Mechanics [ M ]. Cambridge : Cam- bridge University Press, 1985:99 - 104.
6Puttock M J , Thwaite E G . Elastic Compression of Spheres and Cylinders at Point and Line Contact [ M ]. Melbourne:Commonwealth Scientific and Industrial Re- search Organization, 1969 : 15.