Accession Number : AD0695475

Title :   RIBBON REINFORCEMENT OF COMPOSITES.

Descriptive Note : Technical rept. Jan-Aug 68,

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

Personal Author(s) : Halpin,J. C. ; Thomas,R. L.

Report Date : AUG 1969

Pagination or Media Count : 27

Abstract : A clear demonstration of the potential of ribbon-shaped reinforcements in composite materials applications is presented. From a micromechanics analysis, supported by experimental results. Ribbon reinforcement offers superior stiffness properties in the plane of the lamina. The macromechanics analysis introduces the concept of a hybrid composite in which the engineer may combine the outstanding strength properties of fibers with the superior stiffness properties offered by ribbon reinforcements. It is pointed out that the low strength observed for glass-ribbon composites is a consequence of fabrication procedures and does not correspond to the theoretical limiting strength of ribbon reinforcements. The use of ribbon-shaped reinforcements also leads to composites which will have very small isotropic thermal expansion coefficients in the plane of the plate. Thus, ribbon reinforcements provide an attractive means of achieving intermediate to high performance composite possessing dimensional stability. (Author)

Descriptors :   (*COMPOSITE MATERIALS, REINFORCING MATERIALS), (*REINFORCING MATERIALS, TAPES), GLASS TEXTILES, NUMERICAL ANALYSIS, LAMINATES, EPOXY RESINS, REINFORCED PLASTICS, THERMAL EXPANSION, MECHANICAL PROPERTIES

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE