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Rheologica Acta

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01-07-2008 | Original Contribution

Lubricated compression of BMC, a concentrated and fibre-reinforced granular polymer suspension

Authors: Laurent Orgéas, Pierre J. J. Dumont, Thai-Hung Le, Denis Favier

Published in: Rheologica Acta | Issue 5-6/2008

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Abstract

Bulk moulding compounds (BMCs) are thermoset polymer composites widely used in electric and automotive industries. During their processing by injection, BMCs look like fibre-reinforced granular suspensions in the form of pastes, the rheology of which is not well known. For that purpose, lubricated compression tests were performed on BMC samples with various formulations. Firstly, results show that samples flow without sticking to the rheometer’s plates, validating the efficiency of the lubricant. A correction, which requires few assumptions on the rheology of BMC, is then proposed to account for its contribution to the overall axial stress. Thereby, the influences of the axial strain rate, the loading path, the polydispersity of the mineral filler and the fibre content on the BMC flow are analysed. A 1D elementary non-linear viscoelastic model is proposed to capture the main observed trends.

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For the rest of the document, compressive axial strains and stresses will be plotted as positive data.

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Title: Lubricated compression of BMC, a concentrated and fibre-reinforced granular polymer suspension
Authors: Laurent Orgéas
Pierre J. J. Dumont
Thai-Hung Le
Denis Favier
Publication date: 01-07-2008
Publisher: Springer-Verlag
Published in: Rheologica Acta / Issue 5-6/2008
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-008-0276-1

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