An experimental study on the piezoresistive and mechanical behavior of carbon nanocomposites subject to high-rate elastic loading

被引：15
作者：
Hernandez, J. A. [1 ]
Kedir, Nesredin [2 ]
Lim, Boon Him [1 ]
Chen, W. [1 ,2 ]
Tallman, T. N. [1 ]
机构：
[1] Purdue Univ, Sch Aeronaut & Astronaut, W Lafayette, IN 47907 USA
[2] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA
来源：
COMPOSITES SCIENCE AND TECHNOLOGY | 2020年 / 198卷
关键词：
Nanocomposite; Piezoresistivity; High strain rate; Dynamic properties; Carbon nanotubes; Carbon nanofibers; Carbon black; ELECTRICAL-IMPEDANCE TOMOGRAPHY; COMPOSITE-MATERIALS; DISTRIBUTED STRAIN; DAMAGE; SENSITIVITY; SENSOR; CONDUCTIVITY; DISPERSION; BLACK;
D O I：
10.1016/j.compscitech.2020.108285
中图分类号：
TB33 [复合材料];
学科分类号：
摘要：
The electromechanical response of nanofiller-modified polymers subject to high-rate elastic loading has been little explored. In this paper, we address this gap by studying the piezoresistive response and mechanical properties of epoxy modified by three different kinds of carbon nanofillers when subject to high-rate elastic loading. Specifically, long high aspect-ratio epoxy rods were modified by carbon black, carbon nanofibers, and multi-walled carbon nanotubes and impacted in a split Hopkinson pressure bar. Electrical measurements during this loading reveal that the piezoresistive effect can be used to track elastic wave propagation in real-time, resistivity changes occur at the speed of sound of the nanofiller-modified epoxy, and the piezoresistive effect can be used to monitor stress wave properties. Further, dynamic modulus testing revealed that carbon nanofillers have a positive influence on the dynamic stiffness. These results show that piezoresistivity can be employed to provide real-time insight into the elastodynamics of self-sensing nanocomposites.
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页数：10
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