Investigation of Strain Characteristics of Graphite Polyetherether Ketone Using a Nonlinear Analysis and Experimental Methods

Abstract

A geometric nonlinear technique is incorporated in a current finite element program. This nonlinear program allows material nonlinearity for calculating the stresses, strains and failure of composites. The improved program uses an updated Langrangian to calculate the stresses and strains. In addition, it updates the fiber orientation due to displacement in order to calculate the updated stiffness matrix. This method is valuable for large strain values. The analytical data were compared to experimental data obtained from Graphite PolyEtherEther Ketone laminates. To obtain data two geometries were used. Digitized photographs were used to measure the angle change for large strains. (JS)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1990
Accession Number
ADA230527

Entities

People

  • Stephen C. Gould

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • C4I

DTIC Thesaurus Topics

  • Aircrafts
  • Composite Materials
  • Computer Programming
  • Computer Programs
  • Computers
  • Experimental Data
  • Geometry
  • Graphitic Materials
  • Laminates
  • Materials
  • Measurement
  • Mechanical Engineering
  • Mechanics
  • Nonlinear Analysis
  • Standards
  • Stress Strain Relations
  • Three Dimensional

Fields of Study

  • Engineering
  • Physics

Readers

  • Computer Science.
  • Reinforced Composite Materials
  • Structural Dynamics.