Accession Number : AD0713099

Title :   STIFFNESS AND EXPANSION ESTIMATES FOR ORIENTED AND RANDOM FIBROUS COMPOSITES.

Descriptive Note : Technical rept. Apr-Sep 69,

Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Halpin,J. C. ; Pagano,N. J.

Report Date : AUG 1970

Pagination or Media Count : 22

Abstract : There are many technological applications for materials composed of short oriented or randomly arranged fibers interconnected by a bonding substance. A random arrangement of fibers in space can be treated analytically as a laminated solid. In this approximation the homogeneous material is considered to be mathematically equivalent to a material composed of layers corresponds to the volume fraction of fibers of the particular orientation in the material being modeled. The success of the lamination approximation is strongly dependent upon the assumption of physical volume averaging in real materials combined with an ability of estimate the stiffness and expansion properties for an oriented short-fiber ply. Approximate procedures for estimation of ply properties are advanced, using the Halpin-Tsai equations and Schapery's analysis. Substantial agreement is achieved between the experiment for both the oriented and random problems. (Author-PL)

Descriptors :   (*COMPOSITE MATERIALS, MECHANICAL PROPERTIES), FIBERS, DEFORMATION, GLASS TEXTILES, ALIGNMENT

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE