Behavior of composite panels under an applied load and one dimensional heat flux
Abstract
A predictive model of the nonlinear behavior of a polymeric composite panel subjected to a complex thermo-mechanical loading is presented. Included are analytical tools to model the nonlinear viscoelastic-viscoplastic behavior of the panel under conditions of a changing temperature profile resulting from an exposure to a idealized fire on one side of the panel. The changing temperature profile is a consequence of both the unidirectional heat flux and pyrolization of the composite panel. A heat flow model based on material properties of the composite is presented. The validity of this model is substantiated by the good agreement between the analytical predictions and experimental observations that are presented. Constitutive models were developed to include changing material properties due to the changing temperature profile and redistribution of stresses within the panel as a consequence of creep. A computationally efficient viscoelastic-viscoplastic constitutive model was selected and integrated into a classical lamination theory-based program to make predictions. Panels with the same number of plies in each direction but with different stacking sequences were made and exposed to a constant temperature heat source while under a tensile load. Strains were recorded on the panel surface opposite the fire. Comparisons of experimental and predicted strains and temperature profiles are presented.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- October 2000
- Bibcode:
- 2000PhDT.......169P