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Time–temperature equivalence in the tack and dynamic stiffness of polymer prepreg and its application to automated composites manufacturing

Crossley, Richard J.; Schubel, Peter J.; De Focatiis, Davide S.A.

Authors

Richard J. Crossley

Peter J. Schubel peter.schubel@nottingham.ac.uk

Davide S.A. De Focatiis davide.defocatiis@nottingham.ac.uk



Abstract

A recently developed peel test designed to simulate the automated tape lay-up (ATL) process was used to measure tack and dynamic stiffness of newly developed ATL prepregs. Resin was extracted from the prepreg process before impregnation of the fibres. Isothermal small amplitude frequency sweeps were carried out in shear rheology to determine time–temperature superposition parameters in the form of Williams–Landel–Ferry equation. Gel permeation chromatography and differential scanning calorimetry demonstrated that the resin was not significantly changed during the prepregging process. The WLF parameters were used to transpose isothermal tack and dynamic stiffness results with excellent agreement found. This relationship offers manufacturers using composite prepreg a method to maximise and maintain tack levels at different feed rates by appropriate changes in temperature. This is of significant importance in improving the reliability of automated composite lay-up processes such as AFP and ATL, whose feed rate must vary to accommodate lay-up operations.

Journal Article Type Article
Publication Date Sep 1, 2013
Journal Composites Part A: Applied Science and Manufacturing
Print ISSN 1359-835X
Electronic ISSN 1359-835X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 52
APA6 Citation Crossley, R. J., Schubel, P. J., & De Focatiis, D. S. (2013). Time–temperature equivalence in the tack and dynamic stiffness of polymer prepreg and its application to automated composites manufacturing. Composites Part A: Applied Science and Manufacturing, 52, doi:10.1016/j.compositesa.2013.05.002
DOI https://doi.org/10.1016/j.compositesa.2013.05.002
Publisher URL http://www.sciencedirect.com/science/article/pii/S1359835X1300136X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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