The experimental determination of prepreg tack and dynamic stiffness

Crossley, R. J. and Schubel, P. J. and Warrior, N. A. (2012) The experimental determination of prepreg tack and dynamic stiffness. Composites Part A: Applied Science and Manufacturing, 43 (3). pp. 423-434. ISSN 1359-835X

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A new peel test has been developed which quantifies the tack and dynamic stiffness of uncured prepreg. The test is designed to simulate the automated tape lay-up (ATL) and automated fibre placement (AFP) processes. It includes a pressure controlled application stage, where contact time is inversely proportional to peel rate. The use of a thin film allows stiffness to be isolated from peel resistance in a continuous two stage test. A repeatability study revealed consistent results with 16% standard deviation. Tack and stiffness variability has been observed across roll width and between faces in commercial hand lay-up prepregs. The overall tack and stiffness values for commercial hand lay-up prepregs were found to be inconsistent with the levels specified by manufacturers. A temperature increase revealed inconsistent effects on tack between materials. The contradictory results were rationalised by observing failure modes. The two failure modes observed appeared equivalent to those found in pressure sensitive adhesive (PSA) peel. The shear storage modulus of the prepreg resin was compared to the PSA Dahlquist criterion and found to support the principle of contact efficiency. However, the actual value for the criterion is expected to be a function of prepreg specific conditions such as resin content, fibre distribution and surface pattern.

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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/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 22 May 2017 04:53
Last Modified: 22 May 2017 04:53
Uncontrolled Keywords: A. Prepreg; B. Tack; C. Adhesion; D. ATL; B. Tack; Contact time; D. ATL; Dynamic stiffness; Experimental determination; Fibre placement; Hand lay-up; Peel resistance; Peel tests; Prepregs; Pressure-sensitive adhesives; Resin content; Shear storage modulus; Standard deviation; Stiffness values; Surface pattern; Temperature increase; Two stage; Strength of Building Materials; Mechanical Properties; Strength of Building Materials; Test Equipment and Methods; Chemistry; Organic Polymers; Rubber Products; Materials Science;
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
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