Accession Number : AD0746411

Title :   Pulse Attenuation in Composites,

Corporate Author : MCDONNELL DOUGLAS ASTRONAUTICS CO-WEST HUNTINGTON BEACH CALIF

Personal Author(s) : Peck,J. C.

Report Date : 1971

Pagination or Media Count : 30

Abstract : The heterogeneity inherent in composite materials gives rise to additional pulse-attenuation mechanisms not found in homogeneous solids. Geometric dispersion, caused by stress-wave interactions between the constituents (without fracturing) has recently been studied extensively and been shown to be of importance for sufficiently heterogeneous composites. Pulse attentuation is also influenced by various fracture processes which can occur under nominally compressive loads because of the heterogeneity, but much less is known about these effects. The conventional attenuation mechanisms found in homogeneous solids are normally present in composites, although their significance may be altered by the effects of heterogeneity. (Author)

Descriptors :   (*COMPOSITE MATERIALS, MECHANICAL WAVES), STRESSES, COMPRESSIVE PROPERTIES, FRACTURE(MECHANICS), ATTENUATION, LAMINATES, ULTRASONIC RADIATION

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE