Accession Number : ADA305241

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

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Lifshitz, J. M.

PDF Url : ADA305241

Report Date : JAN 1981

Pagination or Media Count : 26

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

Descriptors :   *TEMPERATURE, *STRENGTH(MECHANICS), *STRAIN RATE, *HUMIDITY, *GRAPHITE EPOXY COMPOSITES, SHEAR PROPERTIES, CONTROL, MECHANICAL PROPERTIES, ENVIRONMENTS, PARAMETERS, TENSILE PROPERTIES, CARBON FIBERS, MOISTURE CONTENT, SYNCHRONISM, CHAMBERS, TRANSVERSE, UNIDIRECTIONAL.

Subject Categories : Laminates and Composite Materials
      Physical Chemistry
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE