First Body Versus Third Body: Dialogue Between an Experiment and a Combined Discrete and Finite Element Approach

Abstract

The present paper proposes to analyze relations between the behavior of two bodies in contact (local stress and vibration modes) and the rheology of thirdbody particles. Experiments are performed on a system composed of a polycarbonate disk in contact with a steel cylinder, where birefringent property of polycarbonate allows us to observe shearstress isovalues. Multiscale numerical simulations involve the coupling between finite elements and discrete elements to model simultaneously nonhomogeneous thirdbody flows within a confined contact and dynamical behavior of the bodies in contact. Comparisons between experiments and simulations are performed on the dynamic response of the system, the stress distribution, as well as the evolution of thirdbody particles within the contact. Such comparisons exhibit not only qualitative results but also quantitative ones and suggest a new approach to study in deeper thirdbody rheology.