https://doi.org/10.1051/epjconf/20100631011
Damage law identification of a quasi brittle ceramic from a b ending test using digital image correlation
1
Université de Lyon, CNRS INSA-Lyon,
LaMCoS UMR 5259,
69621
Villeurbanne,
France
2
Université de Lyon, CNRS INSA-Lyon,
MATEIS UMR 5510,
69621
Villeurbanne,
France
3
Saint-Gobain, CREE, 550 av. Alfred Jauffret -
BP 224,
84306
Cavaillon,
France
a e-mail: paul.leplay@insa-lyon.fr
The quasi brittle ceramics show a non linear mechanical behaviour resulting most of the time in a dissymetry between their tensile and compressive stress-strain laws. The characterization of their fracture strengths might be biased if elastic linear formulae are used to analyze classical tests like bending tests. Based on Digital Image Correlation (DIC), a methodology is proposed to characterize materials with dissymmetric behaviours. Applying specific DIC decomposition functions for bending, compressive and tensile tests, a stress-strain model and its damage law are identified for aluminium titanate, a damageable micro cracked ceramic. This identification method using DIC can obviously be applied to other quasi brittle materials.
© Owned by the authors, published by EDP Sciences, 2010
