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.
|Publisher||University of Erlangen-Nuremberg, Institute of Particle Technology|
|Conference||International Congress on Particle Technology, PARTEC 2007|
|Period||27/03/07 → 29/03/07|