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27 March 2019 On the transient piezoresistive response of impacted nanofiber-modified epoxy
J. A. Hernandez, T. N. Tallman
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Proceedings Volume 10970, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019; 1097013 (2019) https://doi.org/10.1117/12.2514259
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States
Abstract
Nanofiller-modified composites have enormous potential for advanced structural health monitoring (SHM) because they are self-sensing via their piezoresistive properties. However, the current state of the art is largely limited to static damage detection between two distinct states (i.e. comparison between pre-damage and post-damaged states). This is an important limitation because transient responses can provide great insight into damage events. It is therefore desirable to incorporate the transient effects into piezoresistive-based SHM. Unfortunately, the transient response of piezoresistive materials has not been widely investigated. To address this limitation, this study examines the piezoresistive response of a slender carbon nanofiber (CNF)-modified epoxy rod specimen due to impact loading as a function of time. More specifically, the change in voltage along the length of the rod is recorded as an idealized one-dimensional elastic plane wave traverses through the specimen. This allows us to directly compare the rate of voltage change in the CNF/epoxy to the speed of sound of the material. The fundamental insights into transient piezoresistivity herein uncovered has the potential to greatly facilitate future advances in piezoresistive-based SHM.
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J. A. Hernandez and T. N. Tallman "On the transient piezoresistive response of impacted nanofiber-modified epoxy", Proc. SPIE 10970, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019, 1097013 (27 March 2019); https://doi.org/10.1117/12.2514259
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KEYWORDS
Structural health monitoring
Manufacturing
Resistance
Composites
Mechanics
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