Measurement and Modelling of Chemical Shrinkage of Thermoset Composites

Yasir Nawab; Nicolas Boyard; Vincent Sobotka; Pascal Casari; Frederic Jacquemin

doi:10.4028/www.scientific.net/KEM.504-506.1129

Paper Titles

Measurement & Modelling of Slip during Plug-Assisted Thermoforming
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The Effect of Temperature, Strain Rate and Strain on the Induced Mechanical Properties of Biaxially Stretched PET
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Mechanical Behavior of Highly-Flexible Elastomeric Composites with Knitted-Fabric Reinforcement
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Measurement and Modelling of Chemical Shrinkage of Thermoset Composites
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Numerical Simulation of the Viscohyperelastic Behaviour of PET near the Glass Transition Temperature
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 504-506Measurement and Modelling of Chemical Shrinkage of...

Measurement and Modelling of Chemical Shrinkage of Thermoset Composites

Abstract:

Knowledge of resin chemical shrinkage is crucial for the determination of residual strains, stresses and warpage of composite parts during curing. Shrinkage measurement is more accurate on several millimetre thick samples. However, in that case thermal properties of resin and the strong coupling between thermoset chemical reactions (generally rapid and strongly exothermal) and thermal fields lead to non-negligible thermal and curing gradients in the piece. It is then necessary to take these variations into account to have an accurate description of the shrinkage. In the present study, a home built device "PVT-α" mould is used to measure the volume variation of vinylester resin and associated composites during the curing and then shrinkage is identified by considering these gradients. The results demonstrate that a linear evolution of the shrinkage with conversion degree is a good model to describe the chemical effect on the global volume behavior of the piece. The contribution of chemical and thermal effects on volume curve is quantified.

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Periodical:

Key Engineering Materials (Volumes 504-506)

Pages:

1129-1134

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.504-506.1129

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Cite this paper

Online since:

February 2012

Authors:

Yasir Nawab, Nicolas Boyard, Vincent Sobotka, Pascal Casari, Frederic Jacquemin

Keywords:

Chemical Shrinkage, Kinetics Law, PVT-α Mould, Thermal Gradients

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