Biaxial Testing of Composites. A Study of the Disk Specimen.

Abstract

The strain fields in composite disks loaded with a pin on one side while the other side was simply supported circumferentially, were examined. Finite Element Analysis (FEA) results indicated that in a balanced, (0(2)/90(2)2s cross-ply composite, the in-plane principal strains were nearly equal and constant within the load pin radius. For a (0/90)S/(90/0)Ss balanced laminate, FEA results indicated an equi-biaxial principal strain field within the same radius. The interlaminar shear strains were shown to be constant through the disk thickness and depended greatly on the interfiber distance and fiber diameter. It was shown that large, closely spaced fibers could intensify the shear strain field to the extent of forming single or multiple delaminations. (AN)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1995
Accession Number
ADA294411

Entities

People

  • Lisa Gee
  • Nikos Tsangarakis
  • Paul V. Cavallaro

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Ceramic Materials
  • Composite Materials
  • Delamination
  • Diameters
  • Fiber Reinforced Composites
  • Finite Element Analysis
  • Graphitic Materials
  • Laminates
  • Materials
  • Materials Laboratories
  • Materials Science
  • Materials Testing
  • Military Research
  • Shear Strength
  • Tensile Strength
  • Thickness

Readers

  • Electrical Engineering
  • Mechanical Engineering/Mechanics of Materials.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Space