A Review of Elastic–Plastic Contact Mechanics

The behavior of regular wavy surfaces in contact is important for the study of rough surface contact, and therefore has applications to the prediction of friction, wear, surface fatigue, and electr...

Predictions of the average surface separation and stiffness between contacting elastic and elastic–plastic sinusoidal surfaces:

Multiscale mechanical and tribological characterizations of additively manufactured polyamide 12 parts with different print orientations

With the MIMEAC friction simulation environment fully developed in the previous chapters, it is now time to embed the theory in the scope of engineering system analysis. Chapter 6 focused on the in-depth analysis of the specific transient behavior of dwell time-, velocity- and normal force-dependent friction. In this chapter, in the form of an outlook, it will be demonstrated how the present theory can be used to analyze complex system dynamics.

Discussion and Outlook

A set of finite element simulations was performed to analyze the creep behavior of an elastic-perfectly plastic hemisphere in contact with a rigid flat. This study focuses on the time-dependent stress relaxation of a fully plastic asperity. Assuming a Garofalo (hyperbolic sine) type material creep law, the asperity shows two distinct phases of relaxation. In the first phase, the asperity creeps with an accelerated creep rate and shows a contact area increase similar to that of a cylindrical geometry. In the second phase, no contact area change can be measured and the asperity creeps with a slower rate. Empirical evolution laws for the asperity creep behavior are presented, analyzing the influence of both material and geometrical parameters. The results are interpreted in terms of transient friction.

C.C. Brot

Papers

A contact model for a creeping sphere and a rigid flat