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Controlling Stress Intensity Factor Histories with Digital Images

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Abstract

It is shown that stress intensity factors (SIF) can be prescribed in mechanical tests by using digital image correlation. A priori resolutions are validated with a posteriori results. A cascade controller is implemented to prescribe SIF histories. A proof of concept is shown when testing a cracked elastomer. A tensile experiment is finally analyzed with a center cracked sheet made of commercially pure titanium. The linearity error is shown to be less than one order of magnitude higher for the closed-loop system when compared to the SIF resolution. However, it is still small compared to the SIF ranges investigated herein.

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Acknowledgments

This work was partially supported by a grant from Region Ile-de-France (plateforme francilienne d’expérimentation mécanique de troisiéme génération). The authors thank Dr. Roux for useful discussions during the project.

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  1. Laboratoire de Mécanique et Technologie (LMT-Cachan), ENS Cachan / CNRS / UPMC / PRES UniverSud Paris, 61 Avenue du Président Wilson, 94235, Cachan Cedex, France

    X. Fayolle & F. Hild

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  1. X. Fayolle
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  2. F. Hild
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Correspondence to F. Hild.

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Fayolle, X., Hild, F. Controlling Stress Intensity Factor Histories with Digital Images. Exp Mech 54, 305–314 (2014). https://doi.org/10.1007/s11340-013-9790-x

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  • DOI: https://doi.org/10.1007/s11340-013-9790-x

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