Accession Number:

ADA175024

Title:

Thermoviscoelastic Characterization and Analysis of Fiber Composite Space Structures.

Descriptive Note:

Final rept. 1 Oct 84-31 Dec 85,

Corporate Author:

MATERIALS SCIENCES CORP SPRING HOUSE PA

Report Date:

1986-02-01

Pagination or Media Count:

170.0

Abstract:

This report begins with the development of the time and temperature-dependent effective constitutive equations for unidirectional fiber composites. The fibers were represented as transversely isotropic and linearly elastic, temperature dependent elements. The deviatoric components of the isotropic matrix material were treated as linearly viscoelastic and thermorheologically complex, while the dilatation components were represented as elastic and temperature dependent. Numerical simulations of a series of isothermal creep tests were performed to determine the effective creep compliance parameters of the composite constitutive equations. The macromechanical response of a composite structural element, as predicted by the effective constitutive equations and their derived parameters, was then verified using results computed using a micromechanical model which explicitly included the fiber and matrix as discrete phases. To determine the potential existence and form of a composite complex modulus, the response of unidirectional composite structural elements to simultaneous sinusoidal temperature and mechanical loads was investigated. Finally, solutions of free vibration and transient dynamic analyses of some simple composite structures were performed to examine the effects of the thermoviscoelastic behavior on the damped response of some simple composite structures.

Subject Categories:

  • Laminates and Composite Materials
  • Mechanics
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE