Universal, additive effect of temperature on the rheology of amorphous solids

Details Universal, additive effect of temperature on the rheology of amorphous solids Universal, additive effect of temperature on the rheology of amorphous solids

2010-05-07

arxiv.org/abs/1005.1179v1

Physics

Condensed Matter

Materials Science

Scientific paper

Extensive measurements of macroscopic stress in a 2D LJ glass, over a broad range of temperatures ($T$) and strain rates ($\dot\gamma$), demonstrate a very significant decrease of the flowing stress with $T$, even much below the glass transition. A detailed analysis of the interplay between loading, thermal activation, and mechanical noise leads us to propose that over a broad ($\dot\gamma,T$) region, the effect of temperature amounts to a mere lowering of the strains at which plastic events occur, while the athermal avalanche dynamics remains essentially unperturbed. Temperature is then shown to correct the athermal stress by a (negative) additive contribution which presents a universal form, thus bringing support to and extending an expression proposed by Johnson and Samwer [1]. Our prediction is shown to match strikingly well numerical data up to the vicinity of $T_g$.

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