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

Crossley, R. J. and Schubel, P. J. and De Focatiis, D. S. A. (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. pp. 126-133. ISSN 1359-835X

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 and stored following the same history. Isothermal small amplitude frequency sweeps were carried out in shear to determine time-temperature superposition (TTS) parameters in the form of the Williams-Landel-Ferry (WLF) 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. Excellent agreement was found for both resin and prepreg specimens. Surprisingly, both cohesive and interfacial failure modes appeared to conform to the TTS principle, suggesting that the contact is limited by the diffusion process. 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 automated fibre placement (AFP) and ATL, whose feed rate must vary to accommodate a range of lay-up operations.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 28 Mar 2017 03:56
Last Modified: 28 Mar 2017 04:58
Uncontrolled Keywords: prepreg; adhesion; automation; lay-up
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1016/j.compositesa.2013.05.002
URI: http://eprints.usq.edu.au/id/eprint/31015

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