Computational multiple scattering analysis of elastic waves in unidirectional composites

International audienc

Thermodynamical mode selection rule observed in thermoacoustic oscillations

A gas column in a tube with a temperature gradient spontaneously begins to oscillate when it is driven away from equilibrium. We observed a transition from the standing- to the traveling-acoustic-wave modes through a quasiperiodic state using a looped tube attached to a resonator. Through the measurements of entropy flow, we experimentally propose a thermodynamical mode selection rule, which acts as a guiding principle for a sequence of unstable modes appearing in nonequilibrium systems

Elastic inhomogeneity and acoustic phonons in Pd-, Pt-, and Zr-based metallic glasses

We have investigated acoustic-phonon behavior of Pd-, Pt-, and Zr-based metallic glasses with the combination of inelastic x-ray scattering and ultrasonic (US) measurements. In the dispersion of the longitudinal acoustic modes at small wave number Q, the phase velocity of phonon tends to exceed the US velocity with a wavelength of macroscopic scale for Pd- and Pt-based glasses, whereas the former goes close to the latter for Zr-based glasses. Furthermore, in all the cases, the mean free path L of phonon apparently increases steeply at a certain Q value. These phenomena on the acoustic phonon behavior can be qualitatively explained by the elastic-wave-scattering theory with a simple two-phase model