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

Juha Koivisto*, M. J. Dalbe, M. J. Alava, S. Santucci

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)
225 Downloads (Pure)

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.

Original languageEnglish
Article number32278
Pages (from-to)1-8
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 31 Aug 2016
MoE publication typeA1 Journal article-refereed

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