Accession Number : AD0782783

Title :   Mechanics of Composite Materials.

Descriptive Note : Final rept. 1 Jul 70-30 Sep 73,


Personal Author(s) : Griffith,John E.

Report Date : 1974

Pagination or Media Count : 9

Abstract : The purpose of this research was to determine the fracture characteristics of particulate (filler) composite materials consisting of an epoxy matrix and either glass or metal fillers. The modes of initial failure and subsequent fracture were considered for establishment of criteria dependent on filler to matrix volume ratio and finite length filler geometry. No increase in strength was detected as a consequence of increasing filler content. On the contrary, increasing glass bead filler content simply lessened the matrix strength in proportion to decreasing matrix volume despite increasing the stiffness of the composite. Strength and stiffness increases were detected for increased finite length metallic filler composite. The consistent fracture criterion was attainment of a critical strain in the epoxy matrix. The distinct step leading to fracture were (1) debonding failure of fibers from the matrix, (2) matrix tearing, (3) friction pull-out of fibers spanning the fracture line. (Modified author abstract)

Descriptors :   *Fiber reinforced composites, *Glass reinforced plastics, *Fracture(Mechanics), Epoxy resins, Beads, Metals, Fillers

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE