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A comparison of gel point for a glass/epoxy composite and a neat epoxy material during isothermal curing

A comparison of gel point for a glass/epoxy composite and a neat epoxy material during isothermal curing
A comparison of gel point for a glass/epoxy composite and a neat epoxy material during isothermal curing
Determination of gel point is important for a modelling assessment of residual stresses developed during curing of composite materials. Residual stresses in a composite structure may have a detrimental effect on its mechanical performance and compromise its integrity. In this article, the evolution in bending stiffness of a glass/epoxy composite material during an isothermal curing process is examined to identify different material stages and behaviour. Differential scanning calorimetry and dynamic mechanical analysis are used to analyse the material behaviour. Gelation is identified as a clear onset in bending stiffness, and vitrification is seen as a decrease in the bending stiffness rate. Often gel point predictions for composite materials are based on neat matrix measurements. However, the results presented in this article demonstrate that the gel point is affected by the presence of the fibre reinforcement.
cure behaviour, material characterisation, thermal analysis, thermoset, glass fibre
0021-9983
917-929
Jakobsen, J.
64b1e773-227f-44cc-bc14-f71dcf9f57bd
Andreasen, J.
9740666f-b6b4-4f56-8e33-987c0f4dd650
Thomsen, O.T.
f3e60b22-a09f-4d58-90da-d58e37d68047
Jakobsen, J.
64b1e773-227f-44cc-bc14-f71dcf9f57bd
Andreasen, J.
9740666f-b6b4-4f56-8e33-987c0f4dd650
Thomsen, O.T.
f3e60b22-a09f-4d58-90da-d58e37d68047

Jakobsen, J., Andreasen, J. and Thomsen, O.T. (2014) A comparison of gel point for a glass/epoxy composite and a neat epoxy material during isothermal curing. Journal of Composite Materials, 48 (8), 917-929. (doi:10.1177/0021998313480197).

Record type: Article

Abstract

Determination of gel point is important for a modelling assessment of residual stresses developed during curing of composite materials. Residual stresses in a composite structure may have a detrimental effect on its mechanical performance and compromise its integrity. In this article, the evolution in bending stiffness of a glass/epoxy composite material during an isothermal curing process is examined to identify different material stages and behaviour. Differential scanning calorimetry and dynamic mechanical analysis are used to analyse the material behaviour. Gelation is identified as a clear onset in bending stiffness, and vitrification is seen as a decrease in the bending stiffness rate. Often gel point predictions for composite materials are based on neat matrix measurements. However, the results presented in this article demonstrate that the gel point is affected by the presence of the fibre reinforcement.

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More information

e-pub ahead of print date: 26 March 2013
Published date: 31 March 2014
Keywords: cure behaviour, material characterisation, thermal analysis, thermoset, glass fibre
Organisations: Civil Maritime & Env. Eng & Sci Unit

Identifiers

Local EPrints ID: 381250
URI: http://eprints.soton.ac.uk/id/eprint/381250
ISSN: 0021-9983
PURE UUID: 295cbf52-4086-49e6-8748-609e2980be1c

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Date deposited: 04 Sep 2015 09:18
Last modified: 08 Jan 2022 18:21

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Contributors

Author: J. Jakobsen
Author: J. Andreasen
Author: O.T. Thomsen

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