Tensile Stress-Strain Behavior of Graphite/Epoxy Laminates.

Abstract

The tensile stress-strain behavior of a variety of graphite/epoxy laminates was examined. Longitudinal and transverse specimens from eleven different layups were monotonically loaded in tension to failure. Ultimate strength, ultimate strain, and stress-strain curves were obtained from four replicate tests in each case. Polynominal equations were fitted by the method of least squares to the stress-strain data to determine average curves. Values of Young's modulus and Poisson 5 ratio, derived from polynomial coefficients, were compared with laminate analysis results. While the polynomials appeared to accurately fit the stress-strain data in most cases, the use of polynomial coefficients to calculate elastic moduli appeared to be of questionable value in cases involving sharp changes in the slope of the stress-strain data or extensive scatter. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1982
Accession Number
ADA304424

Entities

People

  • Donald P. Garber

Tags

DTIC Thesaurus Topics

  • Curve Fitting
  • Data Acquisition
  • Data Analysis
  • Delamination
  • Digital Data
  • Digital Information
  • Epoxy Laminates
  • Failure Mode And Effect Analysis
  • Laminates
  • Materials
  • Measurement
  • Modulus Of Elasticity
  • Strain Gages
  • Stress Strain Relations
  • Tensile Strength
  • Tensile Stress
  • Three Dimensional

Readers

  • Linear Algebra
  • Regression Analysis.
  • Structural Health Monitoring of Composite Structures.