On the Off-Axis Tensile Test for Unidirectional Composites,

Abstract

The off-axis tensile test was examined experimentally to obtain actual displacement fields over the surface of graphite-polyimide coupon specimens; the experimental results were compared with the approximate analytical solution of Pagano and Halpin and newly generated finite element results. A new optical method of high sensitivity moire interferometry was used to determine the actual displacements to high precision. It is shown that the approximate analytical solution and the finite element results compare very favorably with the measured centerline displacements in the test section, and the finite element displacement fields provide excellent agreement with the moire displacements throughout the specimen. Results are presented for a 15 degree fiber orientation and coupon aspect ratios of 5 and 15. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1982
Accession Number
ADA303149

Entities

People

  • Carl T. Herakovich
  • Daniel Post
  • Michael P. Nemeth

Organizations

  • Virginia Tech

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aspect Ratio
  • Biaxial Stresses
  • Composite Materials
  • Elastic Properties
  • Engineering
  • Finite Element Analysis
  • Graphitic Materials
  • Materials
  • Materials Processing
  • Mechanics
  • Orientation (Direction)
  • Shear Modulus
  • Shear Stresses
  • Shear Tests
  • Stress Concentration
  • Stresses
  • Test Methods

Fields of Study

  • Physics

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Structural Health Monitoring of Composite Structures.