Accession Number:

ADA303830

Title:

Hygrothermal Damage Mechanisms in Graphite-Epoxy Composites.

Descriptive Note:

Contract rept.,

Corporate Author:

LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB

Report Date:

1979-12-01

Pagination or Media Count:

154.0

Abstract:

This report covers experimental and analytical studies of T3005209 and T3005208 graphite-epoxy laminates 1 to determine the coupling between applied stress, internal residual stress, and moisture sorption kinetics, 2 to examine the microscopic damage mechanisms due to hygrothermal cycling, 3 to evaluate the effect of absorbed moisture and hygro- thermal cycling on inplane shear response, 4 to determine the permanent loss of interfacial bond strength after moisture absorption and drying, aid 5 to evaluate the three-dimensional stress state in laminates under a combination of hygroscopic, thermal and mechanical loads. Specimens were conditioned to equilibrium moisture content under steady exposure to 55 or 95 RH at 70 or 93 deg C. Some specimens were tested subsequent to moisture conditioning and 100 cycles between -54 deg C and either 70 deg C or 93 deg C. jg p4

Subject Categories:

  • Laminates and Composite Materials
  • Physical Chemistry
  • Mechanics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE