Directional Response of Randomly Dispersed Carbon Nanotube Strain Sensors

Tests on a double lap bonded joint, with transverse strips of randomly oriented carbon nanotubes (CNT) sprayed onto an epoxy adhesive film, showed a positive increment in electrical resistance under tensile load, even though the transverse strains were negative. Other experiments included in this wo...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2020-05, Vol.20 (10), p.2980
Main Authors: Güemes, Alfredo, Pozo Morales, Angel Renato, Fernandez-Lopez, Antonio, Sanchez-Romate, Xoan Xose F, Sanchez, Maria, Ureña, Alejandro
Format: Article
Language:English
Subjects:
Alloys
Bonded joints
Carbon
Chemical vapor deposition
doped resins
Load
Load resistance
Metal plates
multidirectional sensors
Polymers
Sensors
Strain gauges
strain monitoring
Stress analysis
Surfactants
Tensile stress
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Summary:Tests on a double lap bonded joint, with transverse strips of randomly oriented carbon nanotubes (CNT) sprayed onto an epoxy adhesive film, showed a positive increment in electrical resistance under tensile load, even though the transverse strains were negative. Other experiments included in this work involved placing longitudinal and transversal CNT sensors in a tensile loaded aluminum plate, and, as reported by other authors, the results confirm that the resistance change is not only dependent on the strains oriented with the electrode line, while the other strain components also influence the response. This behavior is quite different to that of conventional strain gages which have a near zero sensitivity to strains not aligned to the sensor direction. The dependence of the electrical response on all the strain components makes it quite difficult, possibly unfeasible, to experimentally determine the individual strain components with this kind of sensors; however, the manufacturing of aligned CNT sensors could deal with this issue.
ISSN:1424-8220
1424-8220
DOI:10.3390/s20102980