HYBRID COMPOSITE PANELS WITH FIREPROOFLIGHTWEIGHT CORE AND CARBON FIBER SKIN

摘要

Structural sandwiches are a special form of laminated composite in which thin, strong, stiff, hard,rnbut relatively heavy facings are combined with thick, relatively soft, light and weaker cores tornprovide a lightweight composite stronger and stiffer in most respects than the sum of thernindividual stiffness and strengths. In this investigation lightweight core with a density of aboutrn700 kgm3 were made using ceramic spheres and an inorganic matrix, called polysialate. Theserncores have a compressive strength of about 5 Mpa. Thin slabs of these cores were externallyrnreinforced with carbon fabric to obtain hybrid composite panels. The panels were tested underrnthree point bending using deflection control. The primary test variables were the amount ofrncarbon reinforcement and the behavior after exposure to temperatures of 200, 400 and 600℃.rnBehavior of panels reinforced with Nicalon fibers are compared with the panels reinforced withrncarbon fibers. The results indicate that the system is viable to fabricate lightweight, fireproofrnstructural panels. Delamination of fabrics did not occur in any of the samples. Classical bendingrntheory provides a reasonable prediction of load-deflection behavior.