Étude du comportement thermomécanique de matériaux composites cellulosiques : application à la résistance au feu d'un bloc-porte en bois.

In fire safety engineering, industrial products used in the construction have to satisfy to a fire resistance test. In particular, temperature criterion must be satisfied on the unexposed side of the product. These fire tests are constraining and costly for manufacturers. In this context, Efectis France and the I2M laboratory from Bordeaux University initiated a research program in order to develop a numerical model for simulating a fire resistance test on a door made of wood and wood-based materials (particles and fibers boards). The first results from thermal and thermomechanical modeling compared to real fire test on wood panels are presented in this paper. The numerical model takes in account the wood thermal degradation (pyrolysis) and the evolution of wood properties as a function of temperature. Mots clefs : bois, agglomere de bois, pyrolyse, thermomecanique, incendie, elements finis.