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Multiscale modeling of rapid failure in brittle solids: Branching instabilities

Abstract : The contribution presents results on the modeling of fracture instabilities with a dynamic two-scale damage approach. The evolution law for damage is deduced by homogenization from small-scale descriptions of mode I dynamic propagation of micro-cracks. The model is sensitive with respect to the size of the microstructure through a length parameter present in the damage law. We study the macroscopic failure evolution in brittle solids and the development of associated instabilities like micro-branching. The results of numerical simulations for a reduced-size specimen are compared with experimental results for tensile fracture of PMMA and it is shown that the damage model is able to reproduce the observed micro-branching instabilities and the corresponding crack speed evolutions.
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https://hal.univ-lorraine.fr/hal-02915382
Contributor : Cristian Dascalu Connect in order to contact the contributor
Submitted on : Friday, August 14, 2020 - 12:03:51 PM
Last modification on : Wednesday, August 31, 2022 - 5:22:39 PM

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Cristian Dascalu. Multiscale modeling of rapid failure in brittle solids: Branching instabilities. Mechanics of Materials, Elsevier, 2018, 116, pp.77-89. ⟨10.1016/j.mechmat.2017.03.008⟩. ⟨hal-02915382⟩

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