Friday, January 18, 2013

1301.4080 (Hideyuki Mizuno et al.)

Measuring Spatial Distribution of Local Elastic Modulus in Glasses    [PDF]

Hideyuki Mizuno, Stefano Mossa, Jean-Louis Barrat
Glasses exhibit spatially inhomogeneous elastic properties, which can be investigated by measuring their elastic moduli at a local scale. Various methods to evaluate the local elastic modulus have been proposed. A first possibility is to measure the local stress-local strain curve and to obtain the local elastic modulus from the slope of the curve, or equivalently to use a local fluctuation formula. Another possible route is to assume an affine strain and to use the applied global strain instead of the local strain for the calculation of the local modulus. Most recently, Sollich and Barra introduced a third new approach which is easy to be implemented and has the advantage of low computational cost. In this contribution, we compare these three approaches by using the same model glass and reveal the differences among them caused by the non-affine component of the local strain.
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