Rolling contact stress analysis with the application of a new plasticity model英文电子书.pdf

WEAR ELSEVIER Wear 191 (1996) 35~44 Rolling contact stress analysis with the application of a new plasticity model Yanyao Jiang, Huseyin Sehitoglu Universiry of Illinois at Urbana-Champaign, Urbana, IL 61801, USA Received 9 December 1994; accepted 6 April 1995 Abstract Previous elastic-plastic stress analyses of rolling contact have not produced accurate results of shear strain accumulation because the plasticity models applied in contact analysis were not designed to handle long term ratchetting behavior of a material. In this work, we studied the residual stresses and progressive shear strain ratchetting for the line rolling contact problems utilizing a recently developed semi-analytical approach in conjunction with a new plasticity model. Thek ratio ranges from 5.0 to 9.0 and the Q/P ratio ranges from -0.3 to 0.3, where p0 is the maximum Hertzian pressure, k is the yield stress in shear of the material, Q represents the total tangential force, and P is the total normal load. The material properties used in the simulations are those of 1070 steel with a pearlitic microstructure. It was found that the ratchetting rate of rolling surface movement rapidly decreases with increasing number of rolling passages (cycl