18 April 2016 Real time in-situ sensing of damage evolution in nanocomposite bonded surrogate energetic materials
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The current work aims to explore the potential for in-situ structural health monitoring in polymer bonded energetic materials through the introduction of carbon nanotubes (CNTs) into the binder phase as a means to establish a significant piezoresistive response through the resulting nanocomposite binder. The experimental effort herein is focused towards electro-mechanical characterization of surrogate materials in place of actual energetic (explosive) materials in order to provide proof of concept for the strain and damage sensing. The electrical conductivity and the piezoresistive behavior of samples containing randomly oriented MWCNTs introduced into the epoxy (EPON 862) binder of 70 wt% ammonium perchlorate-epoxy hybrid composites are quantitatively and qualitatively evaluated. Brittle failure going through linear elastic behavior, formation of microcracks leading to reduction in composite load carrying capacity and finally macrocracks resulting in eventual failure are observed in the mechanical response of MWNT-ammonium perchlorateepoxy hybrid composites. Incorporating MWNTs into local polymer binder improves the effective stiffness about 40% compared to neat ammonium perchlorate-polymer samples. The real time in-situ relative change in resistance for MWNT hybrid composites was detected with the applied strains through piezoresistive response.
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Engin C. Sengezer, Engin C. Sengezer, Gary D. Seidel, Gary D. Seidel, "Real time in-situ sensing of damage evolution in nanocomposite bonded surrogate energetic materials", Proc. SPIE 9800, Behavior and Mechanics of Multifunctional Materials and Composites 2016, 98000X (18 April 2016); doi: 10.1117/12.2218856; https://doi.org/10.1117/12.2218856

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