Environmental Effects on High Strain Rate Properties of Graphite/Epoxy Composite

Gershon Yaniv, Gus Peimanidis, Isaac M. Daniel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

A unidirectional graphite/epoxy material was characterized at strain rates ranging from 5 * 10-6 to 5 s-1 under various hygrothermal conditions. New techniques were successfully employed for measuring hygrothermal properties and for strain monitoring of "wet" specimens at high strain rates. A time-temperature-moisture equivalence principle was applied to obtain master curves for the longitudinal, transverse, and in-plane shear moduli and corresponding strengths and ultimate strains of the unidirectional graphite/epoxy. It was found that, except for the longitudinal modulus, which shows a slight increase with strain rate, temperature, and moisture, all other longitudinal properties in general remain unchanged. The transverse modulus increases with strain rate but decreases with increasing temperature and moisture content. All transverse and intralaminar shear properties decrease with increasing temperature and moisture content for a fixed strain rate. Transverse ultimate properties as a function of strain rate show a trend reversal with a local maximum. The in-plane shear strength increases noticeably with strain rate, whereas the ultimate shear strain decreases slightly. The time-temperature-moisture shift function is expressed as a function of two variables, allowing interchangeability of the three parameters, time, temperature, and moisture content.

Original languageEnglish (US)
Title of host publicationTest Methods and Design Allowables for Fibrous Composites
Subtitle of host publication2nd Volume
EditorsChristos C. Chamis
PublisherASTM International
Pages16-30
Number of pages15
ISBN (Electronic)9780803111967
DOIs
StatePublished - 1989
Event2nd Symposium on Test Methods and Design Allowables for Fibrous Composites - Phoenix, United States
Duration: Nov 3 1986Nov 4 1986

Publication series

NameASTM Special Technical Publication
VolumeSTP 1003
ISSN (Print)0066-0558

Conference

Conference2nd Symposium on Test Methods and Design Allowables for Fibrous Composites
Country/TerritoryUnited States
CityPhoenix
Period11/3/8611/4/86

Keywords

  • environmental effects
  • graphite/epoxy composites
  • hygrothermal characterization
  • strain-rate effects

ASJC Scopus subject areas

  • General Materials Science

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