An Experimental Study on Fracture Characteristic of Sandstone Subjected to Cyclic Wetting and Dryings

doi:10.11885/j.issn.1674-5086.2020.09.29.03

Abstract

Abstract: When multi-walled carbon nanotubes (MWCNTs) are added into epoxy resin (EP), the randomly distributed MWCNTs will form a complex conductive network. The MWCNTs take different shapes in the EP resin, and they are either curved or straight, separated or intersected with each other, so the MWCNT/EP nanocomposites possess the characteristics of inductance, resistance and capacitance. In this study, an equivalent RLC internal circuit of the MWCNT/EP composite material was proposed, and the response of the 0.6 wt.% MWCNT/EP composite film to electromagnetic signals was tested. It is found that the MWCNT/EP composite film can resonate under the excitation of electromagnetic waves at a specific frequency, and the resonant frequency shifts with the strain of the film. Hence, the feasibility of using MWCNT/EP composite materials to fabricate wireless strain sensors is proven. Based on the experimental and theoretical analysis of the mechanical-electric characteristics of the MWCNT/EP composite film, the idea of developing a tag-type radio frequency strain sensor is proposed in this article.

Key words: multi-wall carbon nanotube, wireless sensing, frequency shift, force-electric characteristics, strain sensor

CLC Number:

TU452

XU Qiang, YUAN Weifeng. An Experimental Study on Fracture Characteristic of Sandstone Subjected to Cyclic Wetting and Dryings[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 94-101.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.09.29.03

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