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Effect of finite temperatures on the elementary mechanisms of plastic deformation in amorphous materials

Abstract : Using numerical simulations of a model two-dimensional Lennard-Jones glass, we study the effect of small temperatures on the elementary mechanisms of deformation in amorphous materials. A very extensive data set covering several decades of shear rate at various temperatures below and up to the glass transition was compiled. Measurements, which include transverse diffusion, macroscopic stress, and coarse-grained fields (strain, stress) and their spatial correlations, lead us to propose that the avalanche dynamics previously identified in athermal simulations continues to be at work -- and nearly unchanged -- up to the glass transition. It is then argued that in this range, thermal fluctuation essentially shift the strains at which dissipative events take place, which results in a sharp drop of the macroscopic stress level at the lowest temperatures
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Submitted on : Monday, January 30, 2012 - 2:48:12 PM
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Joyjit Chattoraj. Effect of finite temperatures on the elementary mechanisms of plastic deformation in amorphous materials. Other [cond-mat.other]. Université Paris-Est, 2011. English. ⟨NNT : 2011PEST1074⟩. ⟨pastel-00664392⟩

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