Abstract: Multi-valued friction is often observed in lubricated contact systems operating under unsteady sliding conditions. It the past, this behavior has been modeled using a measured time delay between ...

Abstract: A kinematic analysis is presented for the twisting of threaded components loaded by gravity and subjected to axial harmonic vibration. It is shown that the complex motions of twisting due to ...

Abstract: The influence of harmonic normal loads on sliding friction is investigated through analysis of contacts consisting of conical and spherical sliders of hard materials on softer metal surfaces. ...

Abstract: Changes in friction due to angular motions at rough planar contacts are investigated using a compliant contact model that isolates an angular degree-of-freedom. Expressions are developed that ...

Abstract: Threaded components have found ubiquitous use in many systems and structures. Although frequently overlooked, they represent a complex and often critical design element. One can identify numerous ...

Abstract: Nonlinear normal contact vibrations, excited by the application of a dynamic normal load to the contact region formed between rough surfaces, are studied using the method of multiple scales. ...

Abstract: Although many contacts operate under unsteady loading and sliding conditions, friction behavior under such conditions is still not well understood. In this paper we report on a series of ...

Abstract: The planar dynamics of a rough block in nominally stationary or sliding contact with a counter-surface is studied in this work. Starting with the Greenwood-Williamson model of a rough surface, ...

Abstract: Nonlinear vibrations at a Hertzian contact are studied by the perturbation technique known as the method of multiple scales. The vibrations are excited by the dynamic component of an externally ...