Nonlinear Temperature Dependent Failure Analysis of Finite Width Composite Laminates.

Abstract

A quasi-three dimensional, nonlinear elastic finite element stress analysis of finite width composite laminates including curing stresses is presented. Cross-ply, angle-py, and two quasi-isotropic graphite/epoxy laminates are studied. Curing stresses are calculated using temperature dependent elastic properties that are input as percent retention curves, and stresses due to mechanical loading in the form of an axial strain are calculated using tangent modulii obtained by Ramberg-Osgood parameters. It is shown that a'ring stresses and stresses due to tensile loading are significant as edge effect in all types of laminate studies. The tensor polynomial failure criterion is used to predict the initiation of failure. The mode of failure is predicted by examining individual stress contributions to the tensor polynomial. Failure is predicted to always initiate at the free edge, but not always at ply interfaces. The location and mode of failure is shown to be laminate dependent. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1979
Accession Number
ADA301207

Entities

People

  • Aniruddha P. Nagarkar
  • Carl T. Herakovich

Organizations

  • Virginia Tech

Tags

DTIC Thesaurus Topics

  • Composite Materials
  • Elastic Properties
  • Epoxy Laminates
  • Failure Analysis
  • Graphitic Materials
  • Laminates
  • Materials
  • Physical Properties
  • Polynomials
  • Stress Analysis
  • Stresses
  • Three Dimensional

Fields of Study

  • Physics

Readers

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