FRACTURE TOUGHNESS OF SILICA AEROGELS

J. Phalippou , T. Woignier , R. Rogier

Silica aerogels of desired shape have been elaborated to perform critical stress intensity factors evaluations as a function of the density. The fracture toughness of aerogels is measured usin SENB technique in three-point bending. KIC varies in the range 0.8 to 4.8 KPa.m1/2. For aerogels whose bulk density ranges between 0.1 and 0.35 g/cm3 the analysis of the obtained results suggests that KIC varies as ρ1.6±0.2. The fracture energy variation and the critical size flaw derived from toughness, strength and Young's modulus are also presented and discussed.

Domains: Physics archives

J. Phalippou, T. Woignier, R. Rogier. FRACTURE TOUGHNESS OF SILICA AEROGELS. Journal de Physique Colloques, 1989, 50 (C4), pp.C4-191-C4-196. ⟨10.1051/jphyscol:1989431⟩. ⟨jpa-00229507⟩