Non-Linear Dynamics in the shear rate dependence of the flow stress in model amorphous Si samples
Anne TANGUY (Universit� Lyon 1), Claudio Fusco (universit� Lyon 1)
Slip Avalanches in Amorphous Metals
Mon 10:45 - 12:15
Barus-Holley 168
We study here the microscopic origins of the shear rate dependence of the flow stress in model amorphous materials. The model material is described by Stillinger-Weber like interactions with different amounts of directionality (different values of the prefactor of the three-body term in the interatomic potential). Is is shown that the flow stress follows a Herschel-Bulkley non-linear dependence with the shear rate. The microscopic origin of this non-linear law is discussed with the help of non-linear dynamics and local heterogeneities in the atomistic displacement field. [1] D. Rodney, A. Tanguy and D. Vandembroucq, Model. Simul. Mater. Sci. Eng., 19, 083001 (2011) [2] C. Fusco, T. Albaret and A. Tanguy, Phys. Rev. E, 82, 066116 (2010) [3] C. Fusco, A. Tanguy and M. Tsamados, in preparation (2013).