Thermo-elastoplastic sliding frictional contact and wear analysis of FGM-coated half-planes

Abstract

This paper investigates the thermo-elastoplastic sliding frictional contact and wear problem of a functionally graded material (FGM) coated homogeneous half-plane subjected to a rigid cylindrical punch. The coating has arbitrarily varying material properties including elastic modulus, Poisson’s ratio, thermal expansion coefficient, wear coefficient, etc. The graded layer is modeled using a thermo-elastoplastic constitutive model of FGM to evaluate the contact pressure, in-plane stress, and temperature field. A modified Archard model is used to characterize the wear behavior of FGM coating, and the influence of wear on the stress and strain behavior is considered. The constitutive model and wear model are implemented in the finite element method (FEM) to study the thermo-elastoplastic sliding frictional contact and wear behavior of FGM coating. After the validation of the numerical approach, the effects of plasticity, wear, cycle number, gradient index, and gradient form are discussed. Simulation results show that changing the gradient form and gradient index can prevent contact damage and reduce frictional wear.