Increased Fracture Toughness of Graphite-Epoxy Composites Through Intermittent Interlaminar Bonding.

Abstract

The objective of this study has been to increase the fracture toughness of multi-layer continuous-filament graphite-epoxy composites. The method used is intermittent interlaminar bonding, which can lead to a large increase in the fracture surface area. In this study we achieved intermittent bonding through introduction of thin perforated Mylar between the layers of the composite. For the best optimum condition included in this study, fracture toughness was increased from about 100 kJ/sq m for untreated specimens to an average of about 500 kJ/sq m, while tensile strength dropped from 500 MPa to 400 MPa, and elastic modulus remained the same at about 75 GPa. An approximate analysis is presented to explain the observed improvement in toughness. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1979
Accession Number
ADA301864

Entities

People

  • David K. Felbeck
  • Li-chung Jea

Organizations

  • University of Michigan

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Delamination
  • Epoxy Composites
  • Fiber Reinforced Composites
  • Geometry
  • Graphite Epoxy Composites
  • Graphitic Materials
  • Laminates
  • Materials
  • Michigan
  • Modulus Of Elasticity
  • Shear Strength
  • Shear Stresses
  • Tensile Strength
  • Thickness
  • Transverse

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Structural Health Monitoring of Composite Structures.
  • Thin Film Deposition Science.