The Role of Stitch Yarn on the Delamination Resistance in Non-crimp Fabric: Chemical and Physical Interpretation

Author(s)

Shiino, Marcos Yutaka ; Pelosi, Tatiane Scarabel ; Hilario Cioffi, Maria Odila ; Donadon, Mauricio Vicente

• Document type: Journal article
• Source: Journal of Materials Engineering and Performance; v. 26, n. 3, p. 978-986, MAR 2017.
• Web of Science Citations: 7

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. (AU)

• FAPESP's process: 11/01937-0 - Crack growth rate in 5HS carbon/epoxy composites manufactured by RTM: Relationship between axial loadings with pure modes of delamination I and II
• Grantee: Marcos Yutaka Shiino
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 12/07646-0 - Evaluation of pressure gradient effect of RTM process on 5HS laminate by conducting DCB fatigue test
• Grantee: Marcos Yutaka Shiino
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate