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Homogenization of diffuse delamination in composite laminates

Homogenization of diffuse delamination in composite laminates
Homogenization of diffuse delamination in composite laminates
Diffuse delamination induced by transverse cracking is usually the secondary damage mode when a composite laminate experiences tensile loading. The fist damage mechanism in such a laminate is transverse cracking which has been widely investigated with both analytical methods and " mechanism-based" constitutive laws. Delamination induced by matrix cracking is already studied extensively by analytical approaches, however, a proper homogenization way has not been proposed yet. In this paper, a modification to an available cohesive constitutive law is proposed which is capable of considering the effect of diffuse delamination without the necessity of consideration of an actual discontinuity between the layers. The proposed constitutive law is then compared against its equivalent models containing interlaminar discontinuity and it is shown that the obtained results from both models are in good. Then the proposed modification is used in Double Cantilever Beam (DCB) specimen and the obtained results are found coincident with the equivalent model with diffuse discontinuities at the interface. Finally, a damaged cross-ply laminate is modeled under the boundary conditions of tensile loading and also 3-point bending with and without the proposed cohesive modification. In tensile loading, the results of both cases are similar; however, it is shown that in bending, the unmodified cohesive law predicts the lateral stiffness larger than the proposed modification. The lateral stiffness of the equivalent model with discontinuities as crack indicates that the proposed modification is able to properly consider the lateral stiffness decrease.
composite laminates, damage, diffuse delmination, homogenization, interface
0263-8223
113-120
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Hosseini-Toudeshky, Hossein
772af740-2748-4c22-8aa3-69868fb29673
Mohammadi, Bijan
b895f67a-7128-4b11-bf96-e06781a1d392
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Hosseini-Toudeshky, Hossein
772af740-2748-4c22-8aa3-69868fb29673
Mohammadi, Bijan
b895f67a-7128-4b11-bf96-e06781a1d392

Jalalvand, Meisam, Hosseini-Toudeshky, Hossein and Mohammadi, Bijan (2013) Homogenization of diffuse delamination in composite laminates. Composite Structures, 100, 113-120. (doi:10.1016/j.compstruct.2012.12.022).

Record type: Article

Abstract

Diffuse delamination induced by transverse cracking is usually the secondary damage mode when a composite laminate experiences tensile loading. The fist damage mechanism in such a laminate is transverse cracking which has been widely investigated with both analytical methods and " mechanism-based" constitutive laws. Delamination induced by matrix cracking is already studied extensively by analytical approaches, however, a proper homogenization way has not been proposed yet. In this paper, a modification to an available cohesive constitutive law is proposed which is capable of considering the effect of diffuse delamination without the necessity of consideration of an actual discontinuity between the layers. The proposed constitutive law is then compared against its equivalent models containing interlaminar discontinuity and it is shown that the obtained results from both models are in good. Then the proposed modification is used in Double Cantilever Beam (DCB) specimen and the obtained results are found coincident with the equivalent model with diffuse discontinuities at the interface. Finally, a damaged cross-ply laminate is modeled under the boundary conditions of tensile loading and also 3-point bending with and without the proposed cohesive modification. In tensile loading, the results of both cases are similar; however, it is shown that in bending, the unmodified cohesive law predicts the lateral stiffness larger than the proposed modification. The lateral stiffness of the equivalent model with discontinuities as crack indicates that the proposed modification is able to properly consider the lateral stiffness decrease.

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More information

Published date: 30 June 2013
Keywords: composite laminates, damage, diffuse delmination, homogenization, interface

Identifiers

Local EPrints ID: 446596
URI: http://eprints.soton.ac.uk/id/eprint/446596
ISSN: 0263-8223
PURE UUID: ee2e903c-700f-4de8-b00f-17f2d2677d1f
ORCID for Meisam Jalalvand: ORCID iD orcid.org/0000-0003-4691-6252

Catalogue record

Date deposited: 15 Feb 2021 17:33
Last modified: 18 Feb 2021 17:42

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Contributors

Author: Hossein Hosseini-Toudeshky
Author: Bijan Mohammadi

University divisions

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