Experimental and Computational Investigations of Hybrid Interfaces in Hybrid Composite Laminates
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Copyright 2015 by DEStech Publications, Inc. and American Society for Composites. All rights reserved. In this work, hybrid laminates, whose constituents are a shape memory alloy NiTi foil, carbon fabric and epoxy matrix, were manufactured using the vacuum assisted resin transfer molding process. Acid etching and sol-gel surface treatment techniques were applied on both surfaces of the NiTi foil prior to fabricating the hybrid laminates. The interface between NiTi and polymer matrix composite was investigated both experimentally and computationally. The double cantilever beam tests at both room (25oC) and elevated (60oC) temperatures were conducted to study the mode I dominated delamination behavior at the hybrid interface. Distributed strain profiles were measured on both the top and bottom of the specimen using Rayleigh backscattering fiber optics technique. Extensive fractographic analysis utilizing optical and scanning electron microscopy were performed to investigate the fracture modes and mechanisms. Finite element analyses were carried out to assist with the examination and interpretation of experimental results. Load-displacement and strain profiles obtained numerically agreed well with those measured from the experiment.
