Accession Number : AD0758438

Title :   Interrelations and Bounds on Moduli in Composite Materials.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS

Personal Author(s) : Lenoe,Edward M.

Report Date : DEC 1972

Pagination or Media Count : 22

Abstract : REINFORCED COMPOSITES, FIBER COMPOSITESThe governing linear anisotropic elastic field equations for composite materials are reviewed. It is well known that applications of tensor formalism to the general anisotropic constitutive relations lead to invariant relations and transformation laws for compliances and stiffnesses. These results combined with considerations of material volume change, the restrictions associated with positive definite strain energy density, and the requirements of physically meaningful response can be used to derive bounds and interrelationships between the anisotropic moduli for the various classes of material symmetry. These theoretical requirements are compared to available experimentally determined materials constants for filamentary composites and the applicability of the different anisotropic constitutive relations is discussed. (Author-PL)

Descriptors :   (*COMPOSITE MATERIALS, ELASTIC PROPERTIES), ANISOTROPY, TENSOR ANALYSIS, HYDROSTATIC PRESSURE, STRAIN(MECHANICS), REINFORCED PLASTICS, CARBON FIBERS, GRAPHITE, LAMINATES

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE