Repulsion and Attraction between a Pair of Cracks in a Plastic Sheet

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2015
Major/Subject
Mcode
Degree programme
Language
en
Pages
205501/1-5
Series
Physical Review Letters, Volume 114, Issue 20
Abstract
We study the interaction of two collinear cracks in polymer sheets slowly growing towards each other, when submitted to uniaxial stress at a constant loading velocity. Depending on the sample’s geometry—specifically, the initial distances d between the two cracks’ axes and L between the cracks’ tips—we observe different crack paths with, in particular, a regime where the cracks repel each other prior to being attracted. We show that the angle θ characterizing the amplitude of the repulsion—and specifically its evolution with d—depends strongly on the microscopic behavior of the material. Our results highlight the crucial role of the fracture process zone. At interaction distances larger than the process zone size, crack repulsion is controlled by the microscopic shape of the process zone tip, while at shorter distances, the overall plastic process zone screens the repulsion interaction.
Description
Keywords
polymer sheets, collinear cracks, interaction, stress
Other note
Citation
Dalbe, Marie-Julie & Koivisto, Juha & Vanel, Loïc & Miksic, Amandine & Ramos, Osvanny & Alava, Mikko J. & Santucci, Stéphane. 2015. Repulsion and Attraction between a Pair of Cracks in a Plastic Sheet. Physical Review Letters. Volume 114, Issue 20. 205501/1-5. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.114.205501.