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Contamination and Surface Preparation Effects on Composite Bonding

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Contamination and Surface Preparation Effects on Composite Bonding

 

Results presented here demonstrate the effect of several prebond surface contaminants (hydrocarbon, machining fluid, latex, silicone, peel ply residue, release film) on bond quality, as measured by fracture toughness and failure modes of carbon fiber reinforced epoxy substrates bonded in secondary and co-bond configurations with paste and film adhesives.  Additionally, the capability of various prebond surface measurement tools to detect contaminants and potentially predict subsequent bond performance is also shown.  Surface measurement methods included water contact angle, Dyne solution wettability, optically stimulated electron emission spectroscopy, surface free energy, inverse gas chromatography, and Fourier transform infrared spectroscopy with chemometrics analysis.  Information will also be provided on the effectiveness of mechanical and energetic surface treatments to recover a bondable surface after contamination.  The benefits and drawbacks of the various surface analysis tools to detect contaminants and evaluate prebond surfaces after surface treatment were assessed as well as their ability to correlate to bond performance.  Surface analysis tools were also evaluated for their potential use as in-line quality control of adhesive bonding parameters in the manufacturing environment.

 

Author: Eileen O. Kutscha, Paul G. Vahey, Marcus A. Belcher, Peter J. VanVoast, William B. Grace, Kay Y. Blohowiak, Frank L. Palmieri, and John W. Connell

 

Conference: SAMPE Seattle 2017

 

SKU/Code: SE17--0563

Pages: 19


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