The finite element numerical simulation for internal stress of low-speed and heavy roller with surface coating

The model rock bit roller bearing of Baker Hughes Christensen firm in America is considered as the research object in this paper. Finite element package MSC. Marc is applied to simulate the stress of coating material. The results of finite element method (FEM) and the solutions of classical Hertz analytical method are compared to prove the accuracy of FEM model. The stress of roller contacted with inner race and interface stress on coating/ substrate, under different coating thickness and different Young´s modulus are analyzed. Results of this work are helpful for mechanical research and design of coating material.