Accession Number : AD0700390

Title :   ELASTIC CONSTANTS OF ORIENTED FIBERGLASS AT RAISED TEMPERATURES,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Zambakhidze,D. V.

Report Date : 03 OCT 1969

Pagination or Media Count : 15

Abstract : A general differential equation was derived, which characterizes the mech. behavior of glass-reinforced plastics at varying deformation rates. When 0.08-01 percent per min. deformation rates were applied, the moduli of instantaneous elasticity and of rubber elasticity were determined. The orthotropic material SVAM, based on glass-reinforced epoxide-phenol-HCO compound containing 21-2 percent resin., was tested at various angles with respect to the fiber direction and at various temperatures by means of resistance tensometers. The stress-strain curves were recorded using a method based on free bending oscillations of the sample. Young's modulus decreases slowly with increasing temperature up to 85 degrees and independent above 130 degrees. Analogous relations were found with Poisson coefficients. All experimental data satisfy the derived equation. Four elastic constants are adequate for completely describing orthotropic laminates. (Author)

Descriptors :   (*GLASS TEXTILES, ELASTIC PROPERTIES), (*REINFORCED PLASTICS, GLASS TEXTILES), DEFORMATION, DIFFERENTIAL EQUATIONS, MODULUS OF ELASTICITY, POISSONS RATIO, USSR

Subject Categories : Laminates and Composite Materials
      Textiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE