Damage law identification of a quasi brittle ceramic from a b ending test using digital image correlation

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...

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Bibliographic Details
Published in:EPJ Web of conferences 2010, Vol.6, p.31011
Main Authors: Brémand, Fabrice, Leplay, P., Réthoré, J., Meille, S., Baietto, M.-C.
Format: Article
Language:English
Online Access:Get full text
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Summary: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.
ISSN:2100-014X
2100-014X
DOI:10.1051/epjconf/20100631011