Non-Linear Dynamics in the shear rate dependence of the flow stress in model amorphous Si samples
Anne TANGUY (Université Lyon 1), Claudio Fusco (université 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).