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Three-dimensional visualization and quantification of the fracture mechanisms in sparse fibre networks using multiscale X-ray microtomography
Univ Grenoble Alpes, CNRS UMR 5521, Grenoble INP, Lab Sols Solides Struct Risques 3SR, F-38000 Grenoble, France;Univ Grenoble Alpes, CNRS UMR 5518, Grenoble INP, Lab Genie Proc Papetiers LGP2, F-38000 Grenoble, France.
Univ Grenoble Alpes, CNRS UMR 5521, Grenoble INP, Lab Sols Solides Struct Risques 3SR, F-38000 Grenoble, France.
Univ Lyon, Inst Natl Sci Appl Lyon INSA Lyon, CNRS UMR 5259, Lab Mecan Contacts & Struct LaMCoS, F-69621 Lyon, France.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
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2018 (English)In: Proceedings of the Royal Society. Mathematical, Physical and Engineering Sciences, ISSN 1364-5021, E-ISSN 1471-2946, Vol. 474, no 2215, article id 20180175Article in journal (Refereed) Published
Abstract [en]

The structural changes that are induced by the initiation and the propagation of a crack in a low-density paper (LDP) were studied using single edge-notched fracture tests that were imaged under an optical microscope or in laboratory or synchrotron X-ray microtomographs. The two-dimensional optical images were used to analyse the links between the mesoscale structural variations of LDP and the crack path. Medium-resolution X-ray three-dimensional images were used to analyse the variations in the thickness and local porosity of samples as well as their displacement field that were induced by the LDP fracture. High-resolution three-dimensional images showed that these mesostructural variations were accompanied by complex fibre and bond deformation mechanisms that were, for the first time, in situ imaged. These mechanisms occurred in the fracture process zone that developed ahead of the crack tip before the crack path became distinct and visible. They were at the origin of the aforementioned thickness variations that developed more particularly along the crack path. They eventually led to fibre-fibre bond detachment phenomena and crack propagation through the fibrous network. These results can be used to enhance the current structural and mechanical models for the prediction of the fracture behaviour of papers.

Place, publisher, year, edition, pages
ROYAL SOC , 2018. Vol. 474, no 2215, article id 20180175
Keywords [en]
cellulose-based fibrous materials, crack propagation, X-ray microtomography
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:uu:diva-362160DOI: 10.1098/rspa.2018.0175ISI: 000440145500017OAI: oai:DiVA.org:uu-362160DiVA, id: diva2:1255555
Available from: 2018-10-12 Created: 2018-10-12 Last updated: 2018-10-12Bibliographically approved

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Isaksson, Per

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