Nonlinear Behavior of Fiber Composite Materials and Its Effect on the Postbuckling Response of Laminated Plates

Abstract

The nonlinear stress-strain behavior of unidirectional fiber composite material was examined. Two approaches were adopted. The first approach considers the stress-strain as nonlinear elastic relations, which are derived at through the use of a complementary energy density function, and takes into account the material symmetry. The second approach adopts the Ramberg-Osgood representation of one-dimensional stress-strain curves. By utilizing the deformation theory to express the nonlinear parts of the strain, a non-linear stress-strain behavior was obtained. An incremental formulation of these theories was implemented in a finite element analysis. These approaches were examined in the context of postbuckling analysis of thick-section laminated plates.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1990
Accession Number
ADA234203

Entities

People

  • Rami Hajali
  • Su S. Wang

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aspect Ratio
  • Composite Materials
  • Coordinate Systems
  • Equations
  • Finite Element Analysis
  • Geometry
  • Laminates
  • Materials
  • Mechanics
  • Micromechanics
  • Modulus Of Elasticity
  • Polymer Matrix Composites
  • Shear Stresses
  • Stiffness
  • Stress Strain Relations
  • Stresses
  • Unidirectional

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Reinforced Composite Materials
  • Structural Dynamics.