An Investigation of the Failure Response of Laminates under Biaxial Stress.

Abstract

Advanced fiber composites are often used in laminate form in strength critical applications. However the ultimate strength of laminates is very poorly understood, primarily because of a lack of valid experimental data. A biaxial test specimen for laminates based on a tubular geometry was developed and used to determine the failure mechanics of two laminates. The results showed a failure process that includes matrix cracking, but this matrix cracking does not appear to directly affect fiber failure. Fiber failure in the laminate studied determines ultimate strength, and can be predicted based on either a maximum fiber stress of fiber strain criterion applied on a ply level. Keywords: Composite materials, Laminate failure, Biaxial stress.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1987
Accession Number
ADA190039

Entities

People

  • Stephen R. Swanson

Organizations

  • University of Utah

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Composite Materials
  • Engineering
  • Epoxy Laminates
  • Failure Mode And Effect Analysis
  • Industrial Engineering
  • Internal Pressure
  • Laminates
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Mechanics
  • Orientation (Direction)
  • Pressure Vessels
  • Shear Stresses
  • Stress Concentration
  • Stress Strain Relations
  • Stresses

Readers

  • Reinforced Composite Materials
  • Theoretical Analysis.