Structure-properties relationships of moisturized sandwich composite materials under extreme temperature conditions (fire resistance)

摘要

Thermo-mechanical properties of sandwich composite materials used in marine applications have been analyzed as a function of the burning duration with various moisture contents. Dry and wet coupons with glass reinforced polymer skins and balsa wood core (saturated with water) were submitted to fire. The mass loss kinetics and the post-combustion mechanical stiffness and strength were recorded. Facilities used are cone calorimeter following ISO 5660 standard, thermogravimetric analyzer (TGA) and 3-point bending mechanical test device. In addition, numerical simulations were adapted to predict the time and through-thickness dependences to the temperature and to the combustion advancing front d(c) (t). The importance of correlating experimental and simulated results was highlighted in order to accurately describe the structure-properties relationships induced during the decomposition of sandwich composite materials under extreme temperature conditions (fire resistance).