Strain Rate, Temperature, and Humidity Influences on Strength and Moduli of a Graphite/Epoxy Composite.

Abstract

Results of an experimental study of the influence of strain rate, temperature, and humidity on the mechanical behavior of a graphite/epoxy fiber composite are presented. Three principal strengths (longitudinal, transverse, and shear) and four basic moduli (E1, E2, G12, and V12) of a unidirectional graphite/epoxy (T300/5208) composite were followed as a function of strain rate, temperature and humidity. Each test was performed at a constant tensile strain rate in an environmental chamber providing simultaneous temperature and humidity control. Prior to testing, specimens were given a moisture preconditioning treatment at 60 deg C. Values for the matrix-dominated moduli and strength were significantly influenced by both environmental and rate parameters, whereas the fiber-dominated moduli were not. However, the longitudinal strength was significantly influenced by temperature and moisture content. A qualitative explanation for these observations is presented. jg p26

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1981
Accession Number
ADA305241

Entities

People

  • J. M. Lifshitz

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Epoxy Composites
  • Graphitic Materials
  • Laminates
  • Materials
  • Mechanical Properties
  • Mechanics
  • Micromechanics
  • Moisture Content
  • Shear Modulus
  • Shear Properties
  • Shear Strength
  • Shear Stresses
  • Strain Rate
  • Stress Strain Relations
  • Stresses
  • Tensile Strain

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Reinforced Composite Materials