Accession Number : AD0761221

Title :   Micromechanics Failure Criteria for Composites.

Descriptive Note : Final summary rept. 3 Apr 72-7 May 73,

Corporate Author : MCDONNELL DOUGLAS ASTRONAUTICS CO HUNTINGTON BEACH CALIF

Personal Author(s) : Greezczuk,Longin B.

Report Date : 07 MAY 1973

Pagination or Media Count : 152

Abstract : Theoretical and experimental studies are presented of the micromechanics failure criteria for the transverse tensile and shear strengths of composites. Parameters accounted for in the failure theories include: fiber properties, matrix properties, fiber content, void content, volume fraction of ineffective fibers, internal triaxial stresses due to fibers and voids, and the interaction of stresses from fibers and voids. Equations are developed for predicting the influence of voids on elastic properties and internal stresses in solids containing voids. The voids are assumed to be cylindrical and arranged in a square array. Pertinent expressions are given for the Young's moduli, shear moduli, and Poisson's ratios of solids with voids. Approximate expressions are also presented for the internal stresses in solids containing voids. (Modified author abstract)

Descriptors :   (*COMPOSITE MATERIALS, FAILURE(MECHANICS)), LOADS(FORCES), EPOXY RESINS, GLASS TEXTILES, REINFORCED PLASTICS, STRESSES, TENSILE PROPERTIES, DEFECTS(MATERIALS)

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE