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Moisture Effect on Properties of Out-of-Autoclave Laminates with Different Void Content

Published:

December 16, 2020

Author:

Afshin Bayatpour, Mehdi Hojjati

Abstract:

Fabrication of large structures using out-of-autoclave prepreg materials will lead to a great amount of savings in manufacturing costs. In the out-of-autoclave processing method, the presence of voids inside the laminate has been an issue due to the lack of high pressure during manufacturing. This study aims primarily to observe the moisture absorption response of composite samples containing different levels of void. By changing the vacuum level inside the bag during the manufacturing process, three different unidirectional laminates at three levels of void have been manufactured. After immersing the samples in warm water at 60°C for about one year, the moisture absorption level was monitored and then diffusion coefficients were calculated using Fick's law. Results show that the moisture absorption coefficient changes by %8 within the experimental range of void contents. The mechanical behaviour of these laminates has been studied at four different moisture levels by performing dynamic mechanical analysis (DMA) and short beam shear tests. Empirical results indicate that, in general, interlaminar shear strength and glass transition temperature decrease by moisture build-up inside the samples. DiBenedetto equation is proposed to make a correlation between the moisture content and glass transition temperature....

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Company Information:

Concordia University

As a next-generation university, Concordia sets its sights further and more broadly than others. We align the quality of learning opportunities to larger trends and substantial challenges facing society. We pursue technology ...

Montreal, Quebec, Canada

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  • Phone 514-848-2424

Concordia University website

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