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A phase-field model for ductile fracture at finite strains and its experimental verification

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Abstract

In this paper, a phase-field model for ductile fracture previously proposed in the kinematically linear regime is extended to the three-dimensional finite strain setting, and its predictions are qualitatively and quantitatively compared with several experimental results, both from ad-hoc tests carried out by the authors and from the available literature. The proposed model is based on the physical assumption that fracture occurs when a scalar measure of the accumulated plastic strain reaches a critical value, and such assumption is introduced through the dependency of the phase-field degradation function on this scalar measure. The proposed model is able to capture the experimentally observed sequence of elasto-plastic deformation, necking and fracture phenomena in flat specimens; the occurrence of cup-and-cone fracture patterns in axisymmetric specimens; the role played by notches and by their size on the measured displacement at fracture; and the sequence of distinct cracking events observed in more complex specimens.

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Acknowledgments

This research was funded by the European Research Council, ERC Starting Researcher Grant INTERFACES, Grant Agreement No. 279439.

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Authors and Affiliations

  1. Institute of Applied Mechanics, TU Braunschweig, Braunschweig, Germany

    Marreddy Ambati, Roland Kruse & Laura De Lorenzis

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  1. Marreddy Ambati
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  2. Roland Kruse
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  3. Laura De Lorenzis
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Correspondence to Laura De Lorenzis.

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Ambati, M., Kruse, R. & De Lorenzis, L. A phase-field model for ductile fracture at finite strains and its experimental verification. Comput Mech 57, 149–167 (2016). https://doi.org/10.1007/s00466-015-1225-3

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  • DOI: https://doi.org/10.1007/s00466-015-1225-3

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