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Vacuum bag moulding of large thermoplastic parts in commingled glass/PET

Gibson, A.G. / Ijaz, M. / Dodds, N. / Sharpe, A. / Knudsen, H.

This paper describes the development of a thermoplastic composite system for structural application in the chassis of an electrically propelled bus. The work involved the characterisation and modelling of a vacuum bag moulding process using a woven commingled thermoplastic composite precursor. The matrix materials were PET and a PET copolymer. The process employs an ambient pressure oven, with tooling that can be made from composite, metal or ceramic. The process results in good quality laminates, with a void content generally lower than 1%. The temperature profile through the part and the consolidation behaviour were characterised and modelled. It was found that the thermal profile could be modelled with adequate accuracy using 'single point' values of thermal properties. Experimental measurements showed, for the first time, that consolidation occurs in two stages: a low temperature solid state debulking near to T_g, followed by full melt impregnation at a higher temperature (above T_m in the case of the homopolymer). Both stages in the consolidation process were modelled separately using a simplified version of the Kamal equation.

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Vacuum bag moulding of large thermoplastic parts in commingled glass/PET

Gibson, A.G. / Ijaz, M. / Dodds, N. / Sharpe, A. / Knudsen, H.

This paper describes the development of a thermoplastic composite system for structural application in the chassis of an electrically propelled bus. The work involved the characterisation and modelling of a vacuum bag moulding process using a woven commingled thermoplastic composite precursor. The matrix materials were PET and a PET copolymer. The process employs an ambient pressure oven, with tooling that can be made from composite, metal or ceramic. The process results in good quality laminates, with a void content generally lower than 1%. The temperature profile through the part and the consolidation behaviour were characterised and modelled. It was found that the thermal profile could be modelled with adequate accuracy using 'single point' values of thermal properties. Experimental measurements showed, for the first time, that consolidation occurs in two stages: a low temperature solid state debulking near to T_g, followed by full melt impregnation at a higher temperature (above T_m in the case of the homopolymer). Both stages in the consolidation process were modelled separately using a simplified version of the Kamal equation.

Vacuum bag moulding of large thermoplastic parts in commingled glass/PET

Gibson, A.G. / Ijaz, M. / Dodds, N. / Sharpe, A. / Knudsen, H.

This paper describes the development of a thermoplastic composite system for structural application in the chassis of an electrically propelled bus. The work involved the characterisation and modelling of a vacuum bag moulding process using a woven commingled thermoplastic composite precursor. The matrix materials were PET and a PET copolymer. The process employs an ambient pressure oven, with tooling that can be made from composite, metal or ceramic. The process results in good quality laminates, with a void content generally lower than 1%. The temperature profile through the part and the consolidation behaviour were characterised and modelled. It was found that the thermal profile could be modelled with adequate accuracy using 'single point' values of thermal properties. Experimental measurements showed, for the first time, that consolidation occurs in two stages: a low temperature solid state debulking near to T_g, followed by full melt impregnation at a higher temperature (above T_m in the case of the homopolymer). Both stages in the consolidation process were modelled separately using a simplified version of the Kamal equation.

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Title:

Vacuum bag moulding of large thermoplastic parts in commingled glass/PET

Contributors:

Gibson, A.G. (author) / Ijaz, M. (author) / Dodds, N. (author) / Sharpe, A. (author) / Knudsen, H. (author)

Published in:

Plastics, Rubber and Composites ; 32 ; 160-166

Publication date:

2003

Size:

7 Seiten, 18 Quellen

ISSN:

DOI:

https://doi.org/10.1179/146580103225002605

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Verbundwerkstoff , Autobus , Axialrad , Copolymer , Temperatureinfluss , Biegefestigkeit , Elastizitätsmodul , Finite-Differenz-Methode , mathematisches Modell

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