Path (un)predictability of two interacting cracks in polycarbonate sheets using Digital Image Correlation

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2016-08-31
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Language
en
Pages
1-8
Series
Scientific Reports, Volume 6
Abstract
Crack propagation is tracked here with Digital Image Correlation analysis in the test case of two cracks propagating in opposite directions in polycarbonate, a material with high ductility and a large Fracture Process Zone (FPZ). Depending on the initial distances between the two crack tips, one may observe different complex crack paths with in particular a regime where the two cracks repel each other prior to being attracted. We show by strain field analysis how this can be understood according to the principle of local symmetry: the propagation is to the direction where the local shear - mode KII in fracture mechanics language - is zero. Thus the interactions exhibited by the cracks arise from symmetry, from the initial geometry, and from the material properties which induce the FPZ. This complexity makes any long-range prediction of the path(s) impossible.
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Koivisto, J, Dalbe, M J, Alava, M J & Santucci, S 2016, ' Path (un)predictability of two interacting cracks in polycarbonate sheets using Digital Image Correlation ', Scientific Reports, vol. 6, 32278, pp. 1-8 . https://doi.org/10.1038/srep32278