Title page for ETD etd-08012012-040219

Type of Document

Master's Thesis

Author

Raciti, Stefano

URN

etd-08012012-040219

Title

A twenty DOF element for nonlinear analysis of unsymmetrically laminated beams

Degree

Master of Science

Department

Systems Engineering

Advisory Committee

Advisor Name	Title
Blanchard, Benjamin S. Jr.	Committee Member
Johnson, Eric R.	Committee Member
Kapania, Rakesh K.	Committee Member

Keywords

Aircraft industry

Date of Defense

1987-02-22

Availability

restricted

Abstract

The purpose of this study was to develop a simple one- dimensional finite element
for the nonlinear analysis of symmetrically and unsymmetrically laminated composite
beams including shear deformation. There is a need for a simple and efficient
method for analyzing unsymmetrically laminated beams since no other
study on this topic is currently available. The beam element has ten degrees of
p freedom at each of the two nodes: the axial displacement, the transverse deflection
due to bending and shear, the twisting angle, the inplane shear rotation,
and their derivatives along the axial direction. The formulation, solution procedure,
and the computer program have been evaluated by solving a series of examples
on the static response, free vibration, buckling, and nonlinear vibrations of
isotropic and laminated beams. For unsymmetrically laminated beams, the nonlinear
vibrations were found to have a soft spring behavior for certain boundary
conditions as opposed to a hard spring behavior observed in isotropic and symmetrically
laminated beams. The inplane boundary conditions were found to
have a significant effect on nonlinear responses.

Files

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