期刊
COMPOSITE STRUCTURES
卷 270, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2021.114091
关键词
Structural Health Monitoring; Carbon nanotube; CFRP repair; Strain gauge; Smart structure
资金
- Ministerio de Economia y Competitividad of Spanish Government [PID2019-107874RB-I00]
- Comunidad de Madrid regional government [S2018/NMT-4411]
The carbon nanotube (CNT) doped adhesive film has been shown to have good crack-sensing capabilities, with no negative impact on mechanical performance, and an increase in electrical resistance during crack propagation and adhesive deformation processes.
Crack-sensing capabilities of a carbon nanotube (CNT) doped adhesive film have been analysed from coupon level to a composite repaired panel. Mechanical performance is not negatively affected by the addition of CNTs, due to their good distribution inside the adhesive. Moreover, the electrical resistance increases with displacement in both Single Lap Shear (SLS) and Mode-I joints, due to the combined effect of adhesive deformation and crack propagation. More specifically, Mode-I joints usually show a stick-slip behaviour with sharp increases and arrest phases in the electrical resistance, associated to changes in the failure modes. Furthermore, a structural health monitoring (SHM) test of a composite repair was carried out by different techniques such as acoustic emission, strain gauges and CNT adhesive monitoring. From electrical monitoring of the CNT adhesive, it is possible to identify some load thresholds from which the electrical resistance starts to increase. They coincide with sudden changes of the strain field monitored by the strain gauges, as well as, with sudden peaks of the sound level, being an indicative of crack nucleation, adhesive deformation and, finally, crack propagation. Therefore it highlights the great potential and robustness for on-line SHM purpose of the proposed CNTdoped adhesive films.
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