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

作者：Shiino Marcos Yutaka^*; Pelosi Tatiane Scarabel; Hilario Cioffi Maria Odila; Donadon Mauricio Vicente

来源：Journal of Materials Engineering and Performance, 2017, 26(3): 978-986.

DOI：10.1007/s11665-016-2460-2

• composites
• failure analysis
• mechanical
• organic matrix
• static
• thermal analysis

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.

• 出版日期2017-3
• 单位Univ Estadual Paulista