ELASTIC CONSTANTS OF ORIENTED FIBERGLASS AT RAISED TEMPERATURES,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 03, 1969
- Accession Number
- AD0700390
Entities
People
- D. V. Zambakhidze
Organizations
- National Air and Space Intelligence Center