| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-387 - C5-392 | |
| DOI | https://doi.org/10.1051/jphyscol:1981558 | |
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-387-C5-392
DOI: 10.1051/jphyscol:1981558
NON-LINEAR INTERACTION BETWEEN ULTRASONIC SHEAR WAVES AND DISLOCATIONS IN ALUMINIUM
Y.T. Wang, W.G.B. Britton et R.W.B. StephensChelsea College (University of London), England
Abstract
Shear waves at a frequency of 4.83 MHz have been propagated along the <100> axis of an aluminium crystal of high purity. The second and third harmonics arising from the interaction between the ultrasonic waves and dislocations have been measured at small bias stresses. Up to a stress of 3.2 x 106 dyn.cm-2 the second harmonic amplitude increased and reached a maximum but on the other hand the third harmonic showed a gradual decrease. Both the second and third harmonics were very sensitive to the applied bias stress. A marked difference was found in the response of the second harmonic generation to fundamental waves of different amplitude. Observations have been made of the effect on the harmonic amplitudes arising from the pre-stressing of the specimen.