LSMS conference held by Prof. D. Coker, METU
03.12.10 - LSMS is happy to invite you to a Conférence to be held by Prof. Demir Coker, Aerospace Engineering Department METU, Ankara, Turkey
Dynamic frictional sliding between elastically deformable plates
December 10, 2010, Room GC C3 30, 10 am
The phenomenon of frictional sliding between elastic materials is a dynamically and heterogeneously occurring phenomenon for both quasi-static and dynamic loading applications. The accurate prediction of the dynamics of frictional sliding requires the use of a realistic friction model and a method for modeling the propagation of discontinuities. In this presentation, finite element method is used to model the dynamic frictional sliding between two elastic plates with a straight and smooth interface where a rate- and state-dependent friction model is implemented within a cohesive element framework. The two plates are held together under a vertical compressive load and a horizontal impact velocity is imparted on the bottom plate. Simulations are carried out for varying compressive loads and impact velocities, using the parameters in the friction law obtained from experiments. The results show that relative sliding is a complex phenomenon, composed of three fundamental sliding modes: expanding crack-like, solitary growing self-healing pulses, and a train of steady self-healing pulses. A majority of the sliding consists of the evolution and combination of these three canonical modes with time and space. The rupture is found to propagate at speeds comparable to the speed of sound in the material, and in most cases super-shear speeds. Even though experimental observations of the first two modes of sliding have been shown by Rosakis and coworkers, the train of steady and stable self-healing slip pulses have so far eluded conclusive experimental confirmation.