Unified study of viscoelasticity and sound damping in hard and soft amorphous solids
arxiv(2024)
Abstract
Recent research has made significant progress in understanding the non-phonon
vibrational states present in amorphous materials. It has been established that
their vibrational density of states follows non-Debye scaling laws. Here, we
show that the non-Debye scaling laws play a crucial role in determining
material properties of a broad range of amorphous solids, from “hard"
amorphous solids like structural glasses to “soft" amorphous solids such as
foams and emulsions. We propose a unified framework of viscoelasticity and
sound damping for these materials. Although these properties differ
significantly between hard and soft amorphous solids, they are determined by
the non-Debye scaling laws. We also validate our framework using numerical
simulations.
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