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Crack deflection by core junctions in sandwich structures

Crack deflection by core junctions in sandwich structures
Crack deflection by core junctions in sandwich structures
The paper treats the problem of crack propagation in sandwich panels with interior core junctions. When a face–core interface crack approaches a tri-material wedge, as it may happen at a sandwich core junction, two options exist for further crack advance; one is for the interface crack to penetrate the wedge along the face–core interface, and the second is deflection along the core junction interface. Crack deflection is highly relevant and a requirement for the functionality of a newly developed peel stopper for sandwich structures. The physical model presented in this paper enables the quantitative prediction of the ratio of the toughnesses of the two wedge interfaces required to control the crack propagation, and the derived results can be applied directly in future designs of sandwich structures. The solution strategy is based on finite element analysis (FEA), and a realistic engineering practice example of a tri-material composition (face and core materials) is presented.
interface fracture, fracture mechanics, finite element anaylsis, stress intensity factor, mixed mode fracture
0013-7944
2135-2147
Jakobsen, J.
64b1e773-227f-44cc-bc14-f71dcf9f57bd
Andreasen, J.H.
23c7ab0d-3ce8-4b60-aae5-16b669a53e74
Thomsen, O.T.
f3e60b22-a09f-4d58-90da-d58e37d68047
Jakobsen, J.
64b1e773-227f-44cc-bc14-f71dcf9f57bd
Andreasen, J.H.
23c7ab0d-3ce8-4b60-aae5-16b669a53e74
Thomsen, O.T.
f3e60b22-a09f-4d58-90da-d58e37d68047

Jakobsen, J., Andreasen, J.H. and Thomsen, O.T. (2009) Crack deflection by core junctions in sandwich structures. Engineering Fracture Mechanics, 76 (14), 2135-2147. (doi:10.1016/j.engfracmech.2009.01.013).

Record type: Article

Abstract

The paper treats the problem of crack propagation in sandwich panels with interior core junctions. When a face–core interface crack approaches a tri-material wedge, as it may happen at a sandwich core junction, two options exist for further crack advance; one is for the interface crack to penetrate the wedge along the face–core interface, and the second is deflection along the core junction interface. Crack deflection is highly relevant and a requirement for the functionality of a newly developed peel stopper for sandwich structures. The physical model presented in this paper enables the quantitative prediction of the ratio of the toughnesses of the two wedge interfaces required to control the crack propagation, and the derived results can be applied directly in future designs of sandwich structures. The solution strategy is based on finite element analysis (FEA), and a realistic engineering practice example of a tri-material composition (face and core materials) is presented.

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More information

Published date: September 2009
Keywords: interface fracture, fracture mechanics, finite element anaylsis, stress intensity factor, mixed mode fracture
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 339099
URI: https://eprints.soton.ac.uk/id/eprint/339099
ISSN: 0013-7944
PURE UUID: a14dfdfd-b8a6-43ff-ae0e-e6c9abcb5eea

Catalogue record

Date deposited: 23 May 2012 10:40
Last modified: 18 Jul 2017 05:55

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