Frictional powders: Ratcheting under periodic strain in 3D


Luding, S. and David, C.T. and Garcia-Rojo, R. and Herrmann, H.J. (2008) Frictional powders: Ratcheting under periodic strain in 3D. In: PARTEC 2007, Congress on Particle Technology, 27-29 March 2007, Nuremberg, Germany.

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Abstract:The mechanical response of grains under quasi-static cyclic loading is studied by means of a threedimensional Molecular Dynamics scheme. The response of the system is characterized by an accumulation of plastic deformation with increasing number of cycles. From the (deviatoric) stressstrain relation a ratchet-like behavior is observed: Increasing the coefficient of friction leads to a transition from ratcheting to shake-down, i.e., the accumulation of strain stops. The strain rate shows a sharp transition when friction is increases above a certain value, whereas the fraction of sliding contacts shows a smooth, continuous transition, indicating that both effects are decoupled.
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