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18 April 2016 Strain analysis of nanowire interfaces in multiscale composites
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Recently, the reinforcement-matrix interface of fiber reinforced polymers has been modified through grafting nanostructures – particularly carbon nanotubes and ZnO nanowires – on to the fiber surface. This type of interface engineering has made a great impact on the development of multiscale composites that have high stiffness, interfacial strength, toughness, and vibrational damping – qualities that are mutually exclusive to a degree in most raw materials. Although the efficacy of such nanostructured interfaces has been established, the reinforcement mechanisms of these multiscale composites have not been explored. Here, strain transfer across a nanowire interphase is studied in order to gain a heightened understanding of the working principles of physical interface modification and the formation of a functional gradient. This problem is studied using a functionally graded piezoelectric interface composed of vertically aligned lead zirconate titanate nanowires, as their piezoelectric properties can be utilized to precisely control the strain on one side of the interface. The displacement and strain across the nanowire interface is captured using digital image correlation. It is demonstrated that the material gradient created through nanowires cause a smooth strain transfer from reinforcement phase into matrix phase that eliminates the stress concentration between these phases, which have highly mismatched elasticity.
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Mohammad H. Malakooti, Zhi Zhou, John H. Spears, Timothy J. Shankwitz, and Henry A. Sodano "Strain analysis of nanowire interfaces in multiscale composites", Proc. SPIE 9800, Behavior and Mechanics of Multifunctional Materials and Composites 2016, 980012 (18 April 2016);

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