
Accession Number : AD0762609
Title : A General Continuum Theory with Microstructure for Wave Propagation in Elastic Laminated Composites,
Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF APPLIED MECHANICS AND ENGINEERING SCIENCES
Personal Author(s) : Hegemier,G. A. ; Bache,T. C.
Report Date : DEC 1972
Pagination or Media Count : 24
Abstract : A discussion is presented on a continuum theory with microstructure for wave propagation in laminated composites. Continuum model construction is based upon an asymptotic scheme in which dominant signal wavelengths are assumed large compared to typical composite microdimensions. A hierarchy of models is defined by the order of truncation of the obtained asymptotic sequence. Particular attention is given to the lowest order dispersive theory. The phase velocity spectrum of the general theory is investigated for onedimensional wave propagation at various propagation angles with respect to the laminates. Retention of all terms in the asymptotic sequence is found to yield the exact elasticity spectrum, while spectral collation of the lowest order dispersive theory with the first three modes of the exact theory gives excellent agrement. (Author, modifiedPL)
Descriptors : (*LAMINATES, CONTINUUM MECHANICS), (*COMPOSITE MATERIALS, STRAIN(MECHANICS)), MECHANICAL WAVES, EQUATIONS OF MOTION, MICROSTRUCTURE, STRESSES, NUMERICAL ANALYSIS
Subject Categories : Laminates and Composite Materials
Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE