Accession Number : AD0622084

Title :   INTERLAMINAR SHEAR OF FILAMENT-WOUND REINFORCED PLASTICS.

Descriptive Note : Final rept. for 28 Jun 63-30 Jun 65,

Corporate Author : WHITTAKER CORP SAN DIEGO CALIF NARMCO RESEARCH AND DEVELOPMENT DIV

Personal Author(s) : Keogh,Jim C. ,Jr.

Report Date : 15 JUL 1965

Pagination or Media Count : 126

Abstract : Chemical and/or mechanical means of improving interlaminar shear within glass fiber, filament-wound plastic elements were investigated. One of the newer epoxy resins (ERLA-0400), used in the screening studies, exhibited interlaminar shear strengths in excess of 15,000 psi. The most significant advancement occurred in the mechanical improvement of interlaminar shear by means of fibers overwound helically onto basic structural elements. In addition, overwinding reduces physical property deviations and alters the stress-strain curve from a brittle failure to a nearly ductile mode. In addition to testing of the basic structural elements, triplaner winding was evaluated on thick-wall cylinders. The test articles were composed of overwound rings and were tested compressively in the uniaxial (circumferential) mode. Results indicated that overwinding increases both ultimate compressive strength and fatigue resistance. Also, a ring-stiffened cylinder was designed and fabricated, utilizing overwound elements. This unit was tested by a biaxial, hydrostatic compressive load. Failure occurred at 10,500 psig (ocean depth equivalent: 23,600 ft).

Descriptors :   (*COMPOSITE MATERIALS, FILAMENT WOUND CONSTRUCTION), (*FILAMENT WOUND CONSTRUCTION, COMPOSITE MATERIALS), (*SUBMARINE HULLS, FILAMENT WOUND CONSTRUCTION), (*PLASTICS, FILAMENT WOUND CONSTRUCTION), SHEAR STRESSES, GLASS TEXTILES, REINFORCING MATERIALS, EPOXY RESINS, WINDING, CYLINDRICAL BODIES, RINGS

Distribution Statement : APPROVED FOR PUBLIC RELEASE