Dissolution driven crack branching in polycarbonate

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Dissolution driven crack branching in polycarbonate

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Publication Article, peer reviewed scientific
Title Dissolution driven crack branching in polycarbonate
Author(s) Hejman, Ulf ; Bjerkén, Christina
Date 2011
English abstract
Stress corrosion, in the form of chemically assisted crack growth, in polycarbonate is examined with focus on crack branching characteristics. Cracks with finite width are observed; this is to be expected for dissolution driven cracking. The cracks branched repeatedly and crack widths before and after branching are measured. Both symmetric and asymmetric branching is found. The dissolution rate is assumed to be a linear function of the strain along the crack surface. In the literature, it is proposed that the crack width is proportional to the square of the mode I stress intensity factor. Energy considerations lead to that the sum of branch widths must equal the width of the unbranched crack. The results from the present study correspond fairly well with this assumption. The branching angle is found to be 32º ± 12º, which is in line with results for sharp cracks reported in the literature. The mean growth direction of the branches is found to deviate slightly from the expected straight. No significant correlation between angles and crack widths is found. The scatter in results is mainly addressed to the inherent perturbation sensitivity of stress corrosion cracking. Also numerically simulations of crack branching is performed. These results show promising agreement with the experiments.
DOI http://dx.doi.org/10.1111/j.1460-2695.2010.01508.x (link to publisher's fulltext)
Publisher Wiley-Blackwell
Host/Issue Fatigue and Fracture of Engineering Materials and Structures;4
Volume 34
Pages 227-239
Language eng (iso)
Subject(s) stress corrosion cracking
finite element modelling
Research Subject Categories::TECHNOLOGY::Engineering mechanics::Solid mechanics
Research Subject Categories::TECHNOLOGY::Materials science
Handle http://hdl.handle.net/2043/10397 (link to this page)

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