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Effects of Voids on Postbuckling Delamination Growth in Unidirectional Composites
Department of Aerospace Engineering, Texas A&M University.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-1871-4020
2014 (English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 51, no 5, p. 936-944Article in journal (Refereed) Published
Abstract [en]

This work examines the effects of manufacturing induced voids on the postbuckling behavior of delaminated unidirectional composites. In the finite element model developed, a through-width delamination is introduced close to one surface of a flat panel, and a void is placed in the delamination plane ahead of each delamination front. The panel is subjected to compression in the fiber direction. The postbuckling delamination growth is studied by calculating the strain energy release rate (SERR) using the virtual crack closure technique. Local stress analyses of the region near the delamination front are also performed to further investigate the void effects. It is found that although the presence of void does not significantly alter the postbuckling transverse displacement of the delaminated panel, the induced stress perturbation by the void affects the SERR. The Mode II SERR as well as the total SERR increase depending on the size of the void and its distance from the delamination front. Since the Mode I SERR shows non-monotonic behavior with the applied load, the effects of voids are studied on its maximum value.

Place, publisher, year, edition, pages
2014. Vol. 51, no 5, p. 936-944
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-10423DOI: 10.1016/j.ijsolstr.2013.11.021ISI: 000331158400003Scopus ID: 2-s2.0-84892432013Local ID: 93aa6aa8-932b-4f2a-9e62-6adbe24ef162OAI: oai:DiVA.org:ltu-10423DiVA, id: diva2:983368
Note
Validerad; 2014; 20131126 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Talreja, Ramesh

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