Accession Number : ADA310685

Title :   Compressive Instability and Strength of Uniaxial Filament-Reinforced Epoxy Tubes.

Descriptive Note : Technical note,

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

Personal Author(s) : Davis, John G., Jr

PDF Url : ADA310685

Report Date : MAR 1970

Pagination or Media Count : 48

Abstract : The results of an investigation on the column buckling, local buckling, and crushing strengths of more than 100 uniaxial filament reinforced epoxy tubes are presented. Two types of materials, S-glass-epoxy and boron-epoxy, mere utilized in the investigation. All tubes had a nominal diameter of 0.5 inch (1.3 cm); whereas specimen length ranged from 1 to 40 inches (3 to 100 cm) and mall thickness from 0.015 to 0.098 inch (0.38 to 2.48 mm). Column buckling and local buckling strengths mere compared with theory. The effect of shear deflections in a buckled column had to be considered in order to predict accurately column buckling strengths for both types of tubing. In addition, use of a value for shear modulus approximately equal to one half the shear modulus of the respective materials gave good correlation with experimentally determined column buckling and local buckling strengths for both types of tubing. Further research is required to explain the necessity of using a reduced value of shear modulus in analyzing the behavior of the test specimens. Based on data obtained in the study, the application of boron epoxy to tubular compression members can result in nearly a 50-percent reduction in weight as compared with the utilization of aluminum.

Descriptors :   *BUCKLING, *EPOXY COMPOSITES, THICKNESS, SHEAR MODULUS, ALUMINUM, FILAMENTS, BORON, INSTABILITY, COMPRESSIVE PROPERTIES, COLUMNS(SUPPORTS), CRUSHING.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE