Damage Processes in a Quasi-Isotropic Composite Short Beam Under Three- Point Loading

Abstract

Composite materials have complex failure models that include delamination, fiber debonding and breakage, and matrix microcracking. The influence of these damage models on the failure of the short-beam three-point bend test is investigated for a composite with a quasi-isotropic layup. Failure is found to initiate in a region near the point of application of the load, a location where classical-type analytical descriptions of specimen behavior are unreliable. Furthermore, the locations of failure show little reproducibility. Observed fracture behavior is explained in terms of the overall stress state of the beam before fracture, and failure is predicted from the stress map, using the maximum strain criterion.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1992
Accession Number
ADA259979

Entities

People

  • Bryan H. Fortson
  • Erian A. Armanios

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Composite Materials
  • Failure Mode And Effect Analysis
  • Fibers
  • Finite Element Analysis
  • Governments
  • Laminates
  • Materials
  • Materials Science
  • Numerical Analysis
  • Shear Strength
  • Shear Stresses
  • Standards
  • Two Dimensional
  • United States
  • United States Government

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  • Structural Health Monitoring of Composite Structures.