Title: Evolution of Composite Defects During Manufacturing: Wrinkles & Delamination

Authors: Sandeep Chava and Sirish Namilae

DOI: 10.33599/nasampe/s.20.0071

Abstract: The ubiquitous usage of polymer matrix composites in many applications demands a comprehensive understanding of composite interfaces, which critically affect both the manufacturing processes and the deformation mechanisms. Processing-induced defects in composite structures such as wrinkles and delaminations are primarily a result of inter-ply interfacial movement during manufacturing. In this paper, a new in-situ experimental approach and an ex-situ X-Ray characterization are proposed for developing a fundamental understanding of ply interfaces during composite manufacturing. A carbon fiber laminate is cured in a specially designed autoclave with viewports with plies laid-up on a mold with cylindrical tooling setup to simulate the maximum movement of plies, resulting in the formation of wrinkles and delamination. Three cylindrical tools of radius 9.5mm, 12.7mm and 15.9mm are used in preparing three different molds for the layup. Ply-movement is measured in-situ using Digital Image Correlation (DIC) during the cure cycle through the viewports of the autoclave. In addition, the resulting defects are characterized post-cure using X-Ray Micro-CT. Results show that at wrinkle the maximum out-of-plane movement of 1.32 mm is happening for a 4-ply unidirectional laminate laid up on a mold with 15.9mm tool diameter.

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Conference: SAMPE 2020 | Virtual Series

Publication Date: 2020/06/01

SKU: TP20-0000000071

Pages: 10

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