• Rethore, Julien
• Meille, Sylvain
• Baietto, Marie-Christine
• Leplay, P.

Abstract

Characterizing the crack behaviour requires accurate crack detection and stress intensity factors estimation during controlled crack propagation. Different analytical methods are available, like for instance the elastic compliance technique. Recently, techniques based on the Digital Image Correlation (DIC) have emerged: Finite-Element DIC (FE-DIC) with a finite element decomposition, Integrated-DIC (I-DIC) based on Williams' series decomposition and Regularized-DIC (R-DIC) for mechanical constraints. In this paper, these four methods are compared in terms of measurements of crack lengths and stress intensity factors during a notched bending test. The tested material is damageable quasi-brittle ceramic. The non linear stress-strain behaviour of this ceramic results in complex mechanical fields that are not correctly captured by the compliance method. On the other hand, the R-DIC approach handles the non linear material constitutive behaviour. It allows a deeper analysis of the mechanical fields, the energy dissipation modes and the damage mechanisms during the crack propagation.

Topics

• impedance spectroscopy
• crack
• stress-strain behavior
• bending flexural test
• ceramic
• decomposition