Long-Term Thermal Aging of Two Graphite/Polyimide Composite Materials.

Abstract

A general conclusion of this study was that thermal aging of small graphite/polyimide composite specimens can yield results quite different from results for larger panels more representative of structural parts. Individually aged short beam shear and flexure specimens exhibited large reductions in strengths after aging; the interior regions of the square panels, on the other hand, exhibited only minor property degradation. Aging of small test specimens indicated that the usable lifetime at 2320C is 10000 hours for PMR-15 laminates and 5000 hours for LARC-160 laminates. However, larger panels of both of these materials exhibited usable lifetimes of at least 25000 hours when aged unstressed at 2040C and 2320 C. Unidirectional laminates, large or small, of both LARC-160 and PMR-15 cracked. (KAR) p. 8

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1984
Accession Number
ADA304559

Entities

People

  • James B. Nelson

Organizations

  • Langley Research Center

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Body Weight
  • Composite Materials
  • Degradation
  • Electron Microscopes
  • Failure Mode And Effect Analysis
  • Flexural Properties
  • Flexural Strength
  • Geometry
  • Graphitic Materials
  • Laminates
  • Materials
  • Materials Testing
  • Mechanical Properties
  • Scanning Electron Microscopes
  • Shear Strength
  • Standards
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Mathematics or Statistics
  • Reinforced Composite Materials