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Evaluation of interfacial fracture toughness and friction coefficient in the single fiber fragmentation test
University of Seville, Escuela Superior de Ingenieros, Camino de los Descubrimientos.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
University of Seville, Escuela Superior de Ingenieros, Camino de los Descubrimientos.
University of Seville, Escuela Superior de Ingenieros, Camino de los Descubrimientos.
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2011 (English)In: 11th International Conference on the Mechanical Behavior of Materials (ICM11) / [ed] Mario Guagliano; Laura Vergani, Elsevier, 2011, p. 2478-2483Conference paper, Published paper (Refereed)
Abstract [en]

Single fiber fragmentation test is extensively employed to characterize the fiber-matrix interface in composites. A novel technique for evaluating fracture toughness and friction coefficient at the fiber-matrix interface in an epoxy sample containing a single glass fiber is proposed. Using experimental measurements of the average fragment and debond lengths, Boundary Element (BE) models of the portion of sample corresponding to the average fiber fragment are created for increasing values of the applied strain. From the solution of the BE models, energy release rate (ERR) during crack propagation is evaluated using a Fracture Mechanics based approach which accounts for fiber-matrix interfacial friction. The calculated evolution of the ERR has a reasonably linear dependency on the applied strain, with a decreasing slope for increasing values of the interfacial friction coefficient. Since debond growth is stable, ERR should equal the interfacial fracture toughness during debond propagation. Consequently, interfacial friction coefficient and fracture toughness can be simultaneously determined by parametrically varying the friction coefficient until a null slope is obtained in the linear fit of the numerical solution of the ERR as a function of the applied strain. The applicability of the proposed technique is demonstrated with experimental results taken from the literature.

Place, publisher, year, edition, pages
Elsevier, 2011. p. 2478-2483
Series
Procedia Engineering ; 10
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-31911DOI: 10.1016/j.proeng.2011.04.408Scopus ID: 80052929807Local ID: 63c7d712-85a3-4663-96d0-c4d688823e36OAI: oai:DiVA.org:ltu-31911DiVA, id: diva2:1005145
Conference
International Conference on the Mechanical Behavior of Materials : 05/06/2011 - 09/06/2011
Note
Validerad; 2011; 20111010 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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