Mora, Angel et Czekanski, Aleksander.
2025.
« Effect of carbon nanotube agglomeration on the piezoresistive response of polymer nanocomposite architected materials ».
In Proceedings of the CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025)
Coll. « Progress in Canadian Mechanical Engineering », vol. 8.
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Résumé
The addition of carbon nanotubes (CNTs) into a polymer matrix results in a nanocomposite material with piezoresistive behavior. This piezoresistive behavior has been exploited for strain sensing and self-sensing applications. Architected materials possess unusual properties, such as auxeticity, that makes them suitable for a wide range of applications, e.g., energy absorption, vibration mitigation, or sensors. This has resulted in an increased usage of nanocomposites to fabricate architected materials with added multifunctionality. However, one prevalent issue in the fabrication of nanocomposites is the agglomeration of nanofillers, e.g., CNTs. Usually, a homogeneous distribution of CNTs is desired to improve the piezoresistive response of nanocomposites. The presence of agglomerations may reduce the electrical conductivity of the nanocomposite, and as a result make it less sensitive to changes in electrical resistance. Because of this, a computational study on the effect of CNT agglomeration on the piezoresistive response of architected materials is presented. Two types of architected materials are studied, viz., re-entrant (auxetic) and hexagonal (non-auxetic) two-dimensional lattices. This is done to compare the piezoresistive response in these two scenarios and how agglomeration of CNTs affects each type of lattice. Then, in this study, a micromechanical model for electrical conductivity of polymers filled with CNTs is modified to account for changes in conductivity due to strain. Agglomeration is modeled in the micromechanical model through two agglomeration parameters that take values in the range [0, 1]. Different pairs of values for the agglomeration parameters are considered to analyze the effect of different CNT distributions. Values of the agglomeration parameters are carefully chosen as some pairs of values are physically unfeasible. Then, for a given pair of agglomeration parameters, electrical conductivity can be calculated as a function of strain at each point of an architected material when a voltage boundary condition is applied. Mechanical deformation is applied via a displacement boundary condition. The resistance of the architected material is then calculated at each strain increment to obtain the piezoresistive response and calculate the gauge factor. Such simulations are carried out via finite element simulations. Finally, the piezoresistive curves and gauge factors of auxetic and non-auxetic architected materials are compared in terms of the agglomeration parameters. Insights on how to tune the gauge factor and reduce undesired effects of CNT agglomeration are discussed based upon the results obtained from simulations.
| Type de document: | Compte rendu de conférence |
|---|---|
| Éditeurs: | Éditeurs ORCID Hof, Lucas A. NON SPÉCIFIÉ Di Labbio, Giuseppe NON SPÉCIFIÉ Tahan, Antoine NON SPÉCIFIÉ Sanjosé, Marlène NON SPÉCIFIÉ Lalonde, Sébastien NON SPÉCIFIÉ Demarquette, Nicole R. NON SPÉCIFIÉ |
| Date de dépôt: | 18 déc. 2025 15:16 |
| Dernière modification: | 18 déc. 2025 15:16 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32464 |
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