Accession Number : ADA307211

Title :   Experiments to Determine the Strength of Filament-Wound Cylinders Loaded in Axial Compression.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Card, Michael F.

PDF Url : ADA307211

Report Date : AUG 1966

Pagination or Media Count : 39

Abstract : Results of compression tests conducted on 51 multilayered glass-epoxy cylinders are presented. Tests were conducted at both room temperature and elevated temperatures on cylinders having various helical wrap angles, matrix materials, and diameters. Experimental results indicate that, in some of the cylinders, failures were induced by buckling whereas, in others, failures were induced by thermal degradation and/or nonlinearity in the stiffness of the matrix material in the cylinder wall. The data obtained from the unheated cylinders are compared with buckling predictions based on linear anisotropic shell theory and with material strength predictions based on anisotropic yield criteria. The comparison indicated that agreement obtained between buckling tests and theoretical predictions was comparable to that obtained in previous experience with metal cylinders and that strength predictions were overly conservative. The results suggest that the compressive strength of a filament-wound cylinder can be limited by its material strength and that more refined material strength analyses are needed for multilayered fibrous composites loaded in axial compression.

Descriptors :   *FILAMENT WOUND CONSTRUCTION, *FIBER REINFORCED COMPOSITES, *STRENGTH(MECHANICS), METALS, COMPOSITE MATERIALS, STIFFNESS, MODULUS OF ELASTICITY, MATRIX MATERIALS, STRAIN(MECHANICS), SHELLS(STRUCTURAL FORMS), CYLINDRICAL BODIES, ANISOTROPY, BUCKLING, WALLS, EPOXY COMPOSITES, FAILURE(MECHANICS), COMPRESSIVE STRENGTH, THERMAL DEGRADATION, AXIAL LOADS, POISSON RATIO, WINDING, SHEAR STRENGTH.

Subject Categories : Laminates and Composite Materials
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE