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A novel axisymmetric variational analysis of stress transfer into fibreS through a partially debonded interface
Katholieke Universiteit Leuven.
Katholieke Universiteit Leuven.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
1998 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 58, no 12, p. 1863-1877Article in journal (Refereed) Published
Abstract [en]

Most existing models for the problem of fibre/matrix stress-transfer through a partially debonded interface roughly solve the stress distribution in the debonded zone, neglecting the presence of the perfectly bonded zone. However the stress interactions between two zones is what makes the problem essentially different from the stress-transfer problem for a perfectly bonded interface. This paper suggests a variational approach based on the principle of minimum complementary energy not only in a perfectly bonded zone but also in a zone with a discontinuous interface. The debonded interface is treated as an external boundary on which a presumed interfacial shear stress is specified. A new analytical model, including stress non-uniformity in the radial direction and crack interaction, is derived to describe the stress state around fibre breaks and debonding tips in a single fibre embedded in an infinite matrix. For the presumed shear stress at the debonded interface the minimisation procedure renders the most accurate closed-form solution (under used assumptions) for both interactive zones. Finally, the ‘best' shear stress distribution at the debonded interface is found by using Coulomb's friction law and simple numerical iterations. The stress profiles along both axial and radial directions are presented and compared with results from a numerical model[1] available in the literature and also from finite-element analysis. Good agreements are achieved. Extensive applications of this approach and the derived model are also discussed

Place, publisher, year, edition, pages
1998. Vol. 58, no 12, p. 1863-1877
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-7717DOI: 10.1016/S0266-3538(97)00234-0ISI: 000077643600001Scopus ID: 2-s2.0-0032468084Local ID: 622a2c20-103e-11dc-b9dd-000ea68e967bOAI: oai:DiVA.org:ltu-7717DiVA, id: diva2:980607
Note
Godkänd; 1998; 20070601 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Varna, Janis

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