Energy spectrum evolution of a diffuse field in an elastic body caused by weak nonlinearity.
We study the evolution of diffuse elastodynamic spectral energy density under the influence of weak nonlinearity. It is shown that the rate of change of this quantity is given by a convolution of the linear energy at two frequencies. Quantitative estimates are given for sample aluminum and fused silica blocks of experimental interest.
Akolzin
Alexei
A
Department of Theoretical and Applied Mechanics, University of Illinois, 104 South Wright Street, Urbana, Illinois 61801, USA. akolzine@uiuc.edu
Weaver
Richard L
RL