J. Phys. Colloques
Volume 46, Numéro C10, Décembre 1985Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
|Page(s)||C10-573 - C10-578|
J. Phys. Colloques 46 (1985) C10-573-C10-578
ELASTIC CONSTANTS AND INTERNAL FRICTION OF REINFORCED COMPOSITESH.M. LEDBETTER
Fracture and Deformation Division, Center for Materials Science , National Bureau of Standards, Boulder, Colorado 80303, U.S.A.
We describe experimental studies on the anisotropic elastic constants and internal friction of reinforced composites. Reinforcement types include fiber and fabric. Studied materials include boron-aluminum, glassepoxy, boron-epoxy, graphite-epoxy, and aramid-epoxy. We made most measurements with a Marx three-component oscillator at kilohertz frequencies. In all cases, elastic-constant direction dependence fit relationships derived for homogeneous monocrystals. Usually, elastic stiffness and internal friction show an inverse relationship. In no case did the inclusion-matrix interface appear to contribute significantly to internal friction .