Abstract
In a 3D preform, the out-of-plane reinforcement is effective for decelerating or suppressing the delamination process as the non-crimp fabric does not connect the neighboring laminae effectively. Hence, the interlaminar strength of the stitched laminae is supposed to behave in the same way as a regular unidirectional composite. In order to determine whether or not the stitched yarns contribute to the interlaminar fracture toughness, this study determinated the delamination resistance of a quasi-isotropic laminate. The analysis was based on interlaminar fracture toughness (G Ic) and propagation energy curve in tests conducted in mode I opening with double cantilever beam specimen geometry. The results of fracture toughness as well as strain energy for propagation were compared to their fracture surface. A decrease in the propagation energy prevailed in the surface because the stitch yarn replaced the carbon fiber/epoxy interface, which has better chemical affinities, i.e., covalent bonds.
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The authors acknowledge the financial assistance of FAPESP, through Process Numbers 2012/07646-0 and 2011/01937-0, and IEAMar/UNESP.
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Shiino, M.Y., Pelosi, T.S., Cioffi, M.O.H. et al. The Role of Stitch Yarn on the Delamination Resistance in Non-crimp Fabric: Chemical and Physical Interpretation. J. of Materi Eng and Perform 26, 978–986 (2017). https://doi.org/10.1007/s11665-016-2460-2
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DOI: https://doi.org/10.1007/s11665-016-2460-2