The nonlinear dynamic response of carbon nanotube (CNT) nanocomposite cantilevers is experimentally and theoretically investigated. Nanocomposite cantilevers made of a thermoplastic polymer and high aspect ratio CNTs are subject to a primary resonance base excitation. The experimentally obtained frequencyresponse curves highlight the effects of the CNT/polymer stick-slip energy dissipation on the nonlinear macroscopic dynamic response of the nanocomposite beams. The hysteresis arising from the nanostructural stick-slip gives rise to a change of nonlinearity dominated by the flexural curvature hardening effect towards a softeningbehavioratlowamplitudes.TheCNT/polymerfrictionalslidinghysteresis isheredescribedbyahystereticrestoringforceinthecontextofthenonlinearEuler– Bernoulli beam theory. An initial parametric analysis shows the capability of the model to capture qualitatively the softening–hardening frequency response trend
Talo', M., Carboni, B., Formica, G., Lanzara, G., Snyder, M., Lacarbonara, W. (2020). Nonlinear Dynamic Response of Nanocomposite Cantilever Beams. In W. Lacarbonara (a cura di), New trends in nonlinear dynamics (pp. 49-57) [10.1007/978-3-030-34724-6].
Nonlinear Dynamic Response of Nanocomposite Cantilever Beams
Michela Talò
;Biagio Carboni;Giovanni Formica;Giulia Lanzara;Walter Lacarbonara
2020-01-01
Abstract
The nonlinear dynamic response of carbon nanotube (CNT) nanocomposite cantilevers is experimentally and theoretically investigated. Nanocomposite cantilevers made of a thermoplastic polymer and high aspect ratio CNTs are subject to a primary resonance base excitation. The experimentally obtained frequencyresponse curves highlight the effects of the CNT/polymer stick-slip energy dissipation on the nonlinear macroscopic dynamic response of the nanocomposite beams. The hysteresis arising from the nanostructural stick-slip gives rise to a change of nonlinearity dominated by the flexural curvature hardening effect towards a softeningbehavioratlowamplitudes.TheCNT/polymerfrictionalslidinghysteresis isheredescribedbyahystereticrestoringforceinthecontextofthenonlinearEuler– Bernoulli beam theory. An initial parametric analysis shows the capability of the model to capture qualitatively the softening–hardening frequency response trendI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
