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Computational Mechanics
Published in: Computational Mechanics 1/2016

01-01-2016 | Original Paper

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

Authors: Marreddy Ambati, Roland Kruse, Laura De Lorenzis

Published in: Computational Mechanics | Issue 1/2016

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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.
previous article Modified SFEM for computational homogenization of heterogeneous materials with microstructural geometric uncertainties

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Metadata
Title
A phase-field model for ductile fracture at finite strains and its experimental verification
Authors
Marreddy Ambati
Roland Kruse
Laura De Lorenzis
Publication date
01-01-2016
Publisher
Springer Berlin Heidelberg
Published in
Computational Mechanics / Issue 1/2016
Print ISSN: 0178-7675
Electronic ISSN: 1432-0924
DOI
https://doi.org/10.1007/s00466-015-1225-3

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