Accession Number:

ADA234203

Title:

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

Descriptive Note:

Technical rept.

Corporate Author:

NATIONAL CENTER FOR COMPOSITE MATERIALS RESEARCH URBANA IL

Personal Author(s):

Report Date:

1990-12-01

Pagination or Media Count:

74.0

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.

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE