On the Use of Digital Image Correlation to Analyze the Mechanical Properties of Brittle Matrix Composites

François Hild (1) , Jean-Noël Périé (1) , Jacques Lamon (2) , Matthieu Puyo-Pain (2)

1 LMT - Laboratoire de Mécanique et Technologie
2 LCTS - Laboratoire des Composites Thermostructuraux

The 2D digital image correlation technique needs a single CCD camera to acquire the surface patterns of a region of a specimen in the undeformed and deformed states. With two images, one can determine in-plane displacement and strain fields. Its performance is assessed and discussed in real experimental situations. Thanks to its sub-pixel resolution, it can be used to monitor experiments even for brittle and quasi-brittle materials, namely materials for which the strain levels remain low (less than 0.1% in many cases). Two examples are given. Firstly, elastic properties of BraSiC (a silicon-based braze to assemble SiC/SiC composites) are extracted from kinematic fields estimated by utilizing a digital image correlation method. Secondly, the technique is utilized to analyze experimental results of a plane shear experiment and validate a damage model describing different degradations in a C/C composite material.

Mots clés: Photomechanics

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

François Hild, Jean-Noël Périé, Jacques Lamon, Matthieu Puyo-Pain. On the Use of Digital Image Correlation to Analyze the Mechanical Properties of Brittle Matrix Composites. 2005, 14 p. ⟨hal-00013814⟩