Date of Award

12-1992

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Aeronautics and Astronautics

Abstract

This study continues the investigation of the stratified plate model for the analysis of composites plates. The strata theory models a composite plate as a stack of isotropic matrix and orthotropic, fiber dominated layers. Energy methods are used to derive a set of partial differential equations and boundary conditions as a function of the displacement. An assumed displacement field, of a polynomial in z and a Sine/Cosine function in x and y, generates a solution to a simply supported composite plate with cross plies. A cylindrical bending example is also solved with a polynomial in z and Sine/Cosine function in x and y, displacement. A Ritz polynomial x and y displacement function is used to generate a solution to a composite plate with angle plies. The strata model is expected to be useful for predicting stresses in composites where the matrix material has become viscoelastic.This study continues the investigation of the stratified plate model for the analysis of composites plates. The strata theory models a composite plate as a stack of isotropic matrix and orthotropic, fiber dominated layers. Energy methods are used to derive a set of partial differential equations and boundary conditions as a function of the displacement. An assumed displacement field, of a polynomial in z and a Sine/Cosine function in x and y, generates a solution to a simply supported composite plate with cross plies. A cylindrical bending example is also solved with a polynomial in z and Sine/Cosine function in x and y, displacement. A Ritz polynomial x and y displacement function is used to generate a solution to a composite plate with angle plies. The strata model is expected to be useful for predicting stresses in composites where the matrix material has become viscoelastic.

AFIT Designator

AFIT-GAE-ENY-92D-29

DTIC Accession Number

ADA259001

Comments

The author's Vita page is omitted.

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