Accession Number : ADA306046

Title :   Thermomechanical Response of GR/PI Composites.

Descriptive Note : Final rept. 1 Oct 79-30 Mar 81,

Corporate Author : MATERIALS SCIENCES CORP SPRING HOUSE PA

Personal Author(s) : Rosen, B. W. ; Nagarkar, Aniruddha P. ; Hashin, Zvi

PDF Url : ADA306046

Report Date : MAR 1981

Pagination or Media Count : 104

Abstract : The effects of temperature changes upon the stresses and strains in composite laminates having carbon fibers in a polyimide matrix have been evaluated. The study treated composites having laminae in which there were non-linear stress-strain relations for stresses transverse to the fibers and for axial shear stresses. Material properties were considered to be temperature dependent. Separately, the effects of laminae viscoelastic response were also treated. Recent experimental data for a carbon/polyimide composite material were utilized in the present analyses. The results suggest that, for this material, non-linearities due either to stress or time dependent effects do not appear to be of major practical importance for conventional high temperature composite structures. However, the effects of time dependent characteristics and temperature dependent properties can be of significance in understanding the behavior of dimensionally stable structures designed for long lifetimes. (MM)

Descriptors :   *THERMOMECHANICS, *LAMINATES, *FIBER REINFORCED COMPOSITES, STRESS STRAIN RELATIONS, TIME DEPENDENCE, COMPOSITE MATERIALS, HIGH TEMPERATURE, VISCOELASTICITY, CARBON FIBERS, MATRIX MATERIALS, THERMAL EXPANSION, SHEAR STRESSES, CYCLIC LOADS, POLYIMIDE RESINS, STRESS RELAXATION.

Subject Categories : Laminates and Composite Materials
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE