Abstract
The present chapter is devoted to the evaluation of damage with digital image correlation (DIC). Applications will focus on composite materials. The latter ones are designed to accommodate microcracks through suited microstructures. As such, they constitute a natural class of materials for which damage (or rather damages) is an essential feature of their mechanical behavior. As discussed in a previous chapter (addressing detection of physical damage), DIC can reveal the elementary mechanisms (e.g., dense distribution of microcracks, crack branching along weak interfaces, progressive debonding of interfaces, and subsequent pullout or delamination). It will also be shown that damage laws can be identified with the help of DIC from mechanical tests imaged at different stages of loading. The followed strategy will be seen as reminiscent of the one that was used in the previous chapter dedicated to 1D (i.e., beam like) geometries (from physical to mechanical damage). Here, it will be necessary to couple DIC with finite element models. The benefit will be that in addition to the identified law, a full validation is naturally offered from the highly redundant piece of information contained in the measured displacement fields.
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Acknowledgments
Many results reported in this chapter have been obtained thanks to the help of and discussions with M. Ben Azzouna, S. Calloch, J.-M. Guimard, B. Leboime, J. Réthoré, and N. Swiergiel. Part of the work was supported by Agence Nationale de la Recherche (VULCOMP phases 1 and 2) and grants from Ile de France region (SESAME project entitled “Plate-forme francilienne d’expérimentations mécaniques de 3 e génération” and DICCIT project).
This chapter has been reviewed by Profs. A. Dragon and J. Lemaitre. The authors would like to warmly thank them for their patience and help in improving the compuscript. Last, this chapter is dedicated to Prof. F.A. Leckie (1929–2013) with whom the authors discussed many issues presented herein.
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Hild, F., Périé, JN., Roux, S. (2015). Evaluating Damage with Digital Image Correlation: C. Applications to Composite Materials. In: Voyiadjis, G. (eds) Handbook of Damage Mechanics. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5589-9_26
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