Damage Mechanisms and Indenter Size Effects in Cross Plied Carbon-Carbon Composites

Abstract

The microscopic damage mechanisms which cause failure in 2-D carbon- carbon composite beams tested in three point bend were studied, and the effect of the beam thickness and cross plies in the laminate were examined. Local failure modes caused by loading were catagorized. A linear two-dimensional finite element method was used to model beams of two thicknesses. Failure contours computed with Dendis the Tsai-Wu post processor were in good agreement with the experimentally determined microscopic shear crack initiation sites and load levels in the matrix. The loading indenter's diameter and rigidity were found to be effective in controlling certain types of localized cracking. Theses.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1989
Accession Number
ADA216413

Entities

People

  • Andrew Kenny

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aeronautical Engineering
  • Carbon Carbon Composites
  • Composite Materials
  • Diameters
  • Electron Microscopes
  • Engineering
  • Failure Mode And Effect Analysis
  • Finite Element Analysis
  • Geometry
  • Laminates
  • Materials
  • Materials Testing
  • Mechanics
  • Microscopes
  • Shear Stresses
  • Tensile Strength
  • Two Dimensional

Readers

  • Structural Health Monitoring of Composite Structures.