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Title
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A modeling approach for the complete ductile-brittle transition region : cohesive zone in combination with a non-local Gurson-model
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Author
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Abstract
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| The present study deals with the simulation of crack propagation in the ductile-brittle transition region on the macro-scale. In contrast to most studies in the literature, not only the ductile softening by void growth and coalescence is incorporated but also the particular material degradation by cleavage. A non-local Gurson-type model is employed together with a cohesive zone to simulate both failure mechanisms simultaneously. This consistent formulation of a boundary value problem allows arbitrary high mesh resolutions. The results show that the model captures qualitative effects of corresponding experiments such as the cleavage initiation in front of a stretch zone, the formation of secondary cracks and possible crack arrest. The influence of the temperature on the predicted toughness is reproduced in the whole ductile-brittle transition region without introducing temperature-dependent fit parameters. A comparison with experimental data shows that the shift of the ductile-brittle transition temperature associated with a lower crack-tip constraint can be predicted quantitatively. |
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Language
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English
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Source (journal)
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International journal of fracture. - Leiden
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Publication
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Leiden
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2014
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ISSN
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0376-9429
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DOI
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10.1007/S10704-013-9914-4
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Volume/pages
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185
:1-2
(2014)
, p. 129-153
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ISI
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000328346800008
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Full text (Publisher's DOI)
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