Suvendu Mandal, Markus Gross, Dierk Raabe, Fathollah Varnik
There is growing evidence that the flow of driven amorphous solids is not
homogeneous, even if the macroscopic stress is constant across the system. Via
event driven molecular dynamics simulations of a hard sphere glass, we provide
the first direct evidence for a correlation between the fluctuations of the
local volume-fraction and the fluctuations of the local shear rate. Higher
shear rates do preferentially occur at regions of lower density and vice versa.
The temporal behavior of fluctuations is governed by a characteristic time
scale, which, when measured in units of strain, is independent of shear rate in
the investigated range. Interestingly, the correlation volume is also roughly
constant for the same range of shear rates. A possible connection between these
two observations is discussed.
View original:
http://arxiv.org/abs/1202.3647
No comments:
Post a Comment