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Crack Separation Based Models for Microcracking
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2017 (English)In: Reference Module in Materials Science and Materials Engineering / [ed] Saleem Hashmi, Elsevier, 2017Chapter in book (Refereed)
Abstract [en]

Intralaminar cracking in layers of multidirectional laminates lead to reduced ability of these layers to carry load which is the reason for damaged laminate thermo-elastic properties reduction. The average stress reduction in the damaged layer is uniquely linked with displacements of the crack faces and, therefore, the crack opening displacements (CODs) and the crack face sliding displacements (CSDs) are alternative descriptors in damaged laminate stiffness predictions. In this chapter, exact closed form relationships are established linking thermo-elastic constants of the damaged laminate with crack density in layers and local parameters of the crack (average normalized COD and CSD). These robust local parameters depend on surrounding and damaged layer stiffness and thickness ratio-relationship, which is investigated numerically and described by simple fitting functions. It is also shown that the energy release rate (ERR) for propagation of the intralaminar crack in steady-state conditions has simple expression through the COD and CSD, leading to simple predictive tool for thin ply laminates where the cracking is propagation controlled.

Place, publisher, year, edition, pages
Elsevier, 2017.
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-63295DOI: 10.1016/B978-0-12-803581-8.09910-0ISBN: 978-0-12-803581-8 (electronic)OAI: oai:DiVA.org:ltu-63295DiVA: diva2:1094469
Available from: 2017-05-10 Created: 2017-05-10 Last updated: 2017-05-10

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