STIFFNESS AND EXPANSION ESTIMATES FOR ORIENTED AND RANDOM FIBROUS COMPOSITES.
Technical rept. Apr-Sep 69,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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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 Schaperys analysis. Substantial agreement is achieved between the experiment for both the oriented and random problems. Author-PL
- Laminates and Composite Materials