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Cohesive zone modelling of nucleation, growth and coalesce of cavities
Department of Wind Energy, Technical University of Denmark, Roskilde, Denmark.ORCID iD: 0000-0001-8335-0855
University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. (Materialmekanik, Mechanics of Materials)ORCID iD: 0000-0003-0787-4942
2016 (English)In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673Article in journal (Refereed) Epub ahead of print
Abstract [en]

The stress-deformation relation i.e. cohesive law representing the fracture process in an almost incompressible adhesive tape is measured using the double cantilever beam specimen. As in many ductile materials, the fracture process of the tape involves nucleation, growth and coalesce of cavities. This process is studied carefully by exploiting the transparency of the used materials and the inherent stability of the specimen configuration. Utilising the path independence of the J -integral, the cohesive law is measured. The law is compared to the results of butt-joint tests. The law contains two stress peaks—the first is associated with nucleation of cavities at a stress level conforming to predictions of void nucleation in rubber elasticity. The second stress peak is associated with fracture of stretched walls between fully-grown cavities. After this second peak, a macroscopic crack is formed. The tape suffers at this stage an engineering strain of about 800%. A numerical analysis with the determined cohesive law recreates the global specimen behaviour.

Place, publisher, year, edition, pages
Springer, 2016.
Keyword [en]
Experiment, Defect, Elastomer, Cavity, Post-bifurcation, Adhesive Tape, Cohesive law
National Category
Mechanical Engineering Applied Mechanics
Research subject
Technology
Identifiers
URN: urn:nbn:se:his:diva-13082DOI: 10.1007/s10704-016-0168-9OAI: oai:DiVA.org:his-13082DiVA: diva2:1045137
Funder
ÅForsk (Ångpanneföreningen's Foundation for Research and Development), 14-312
Available from: 2016-11-08 Created: 2016-11-08 Last updated: 2017-01-20Bibliographically approved

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Biel, AndersStigh, Ulf
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School of Engineering ScienceThe Virtual Systems Research Centre
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