An experimental and computational study on a NiTi/polyimide Matrix composite interface

Abstract eng:
For the first time, shape memory alloys (SMA) were successfully co-cured in a polyimide matrix composite to create high temperature, smart, hybrid composite laminates. In the work presented herein, the nickel-rich nickel titanium (NiTi) foil was used as the SMA constituent. A combination of laser ablation and amide acid sol-gel surface treatment performed on the NiTi foil created robust adhesion between the foil and the polyimide matrix. The mode-I fracture toughness of the hybrid SMA-composite interface was investigated via the double cantilever beam (DCB) test with in-situ digital image correlation (DIC) measurements. The dominant mode of failure revealed after the DCB tests was cohesive. Phase transformation in the NiTi foil was observed during the isothermal DCB tests at 25°C. Finite element analyses of the hybrid DCB specimen indicated that the NiTi foil underwent stress-induced phase transformation in the vicinity of the crack tip prior to and during crack propagation.

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