Thermal stress distribution around a thermally-insulated polygonal cutout in graphite/epoxy composite laminates under heat flux

Abstract

In this study, the effect of influencing parameters on the stress distribution around a polygonal cutout within a laminated composite under uniform heat flux was analytically examined. The analytical method was developed based on the classical laminated plate theory and two-dimensional thermo-elastic method. A mapping function was employed to extend the solution of a perforated symmetric laminate with a circular cutout to the solution of polygonal cutouts. The effect of significant parameters such as the cutout angular position, bluntness and aspect ratio, the heat flux angle and the laminate stacking sequence in symmetric composite laminate containing triangular, square and pentagonal cutouts was studied. The Neumann boundary condition was used at the edges of the thermally insulated polygonal cutout. The laminate was made of graphite/epoxy (AS/3501) material with two different stacking sequences of [30/45]_s and [30/0/−30]_s. The analytical solutions were well validated against finite element results.

Keywords

analytical solution / thermal stress analysis / polygonal cutout / complex variable method / polymeric composite

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