Effect of Carbon Nanotubes Percentage on the Gage Factor in Structural Health Monitoring Sensors

Document Type : Original Article

Authors

1 Science and Technology Center of Excellence (STCE), Cairo.

2 Military Technical College, Egypt.

3 Mechanical Eng. Dept., Faculty of Engineering, University of Helwan, Cairo, Egypt.

10.1088/1742-6596/2616/1//asat.2025.453558

Abstract

Within the realm of composite health monitoring, carbon nanotubes have gained prominence as a crucial research subject, acclaimed for their superior performance and mechanical qualities. However, there has been inadequate emphasis on the capacity of carbon nanotube film sensors to monitor strain across different directions proficiently. A strain sensor has been developed for applications in structural health monitoring (SHM), using a carbon nanotube polymer material that enhances the interfacial bonding among the nanotubes. High-sensitivity polyurethane/multi-walled carbon nanotube (MWCNT) composite strain sensors were developed. This process unfolded in two stages: the initial stage concentrated on formulating a compound that detects strain by modifying the proportions of carbon nanotubes until effective strain sensing was realized. Nanocomposite films were created by adjusting MWCNT concentrations (0.75–2 wt %) using a direct mixing approach. The subsequent stage involved evaluating these nanocomposites' microscopic structure, thermal stability, and establishing a gauge factor at various strain levels. Generally, experimental findings indicate that the nanocomposite with 0.75 wt% MWCNT exhibited the most favorable strain sensing characteristics, achieving a gauge factor of 27.55 at 20% strain.
International Conference on Aerospace Sciences and Aviation Technology
Volume 21, Issue 21
21st International Conference on Aerospace Sciences & Aviation Technology, ASAT 21, 2025.
September 2025
Pages 1-11

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