The nonlinear dynamic response of carbon nanotube (CNT)/polymer nanostructured hysteretic beams is investigated with the aim of achieving optimal nonlinear material designs in terms of maximum multistability bandwidth. Leveraging on multistability is indeed regarded nowadays as an additional functionality for smart multifunctional structures in a variety of engineering applications, with the potential of promoting a growing aerodynamic morphing demand. Optimal solutions are found employing asymptotically obtained Frequency Response Curves (FRC) over a certain range of excitation frequencies, by varying the meaningful nanostructured beams parameters, such as the CNT/polymer interfacial shear strength, the CNT volume fraction, direction and agglomeration, the CNT functionalization through the cross-section thickness. Both accuracy and efficiency are attained through a nonlinear hysteretic beam model, obtained by reduction of a 3D mesoscopic theory, subsequently treated via the method of multiple scales to yield the asymptotic dynamic response. The richness of the optimal solutions is induced by the unusual and unique combination of material and geometric nonlinearities, the former associated with the interfacial frictional sliding that yields hysteresis, the latter with stretching nonlinearities of the beam itself.
Formica, G., Lacarbonara, W. (2021). NONLINEAR DYNAMIC OPTIMIZATION OF HYSTERETIC NANOSTRUCTURED BEAMS. In Proceedings of ECCOMAS-WCCM XIV - World Congress on Computational Mechanics.
NONLINEAR DYNAMIC OPTIMIZATION OF HYSTERETIC NANOSTRUCTURED BEAMS
Giovanni Formica;
2021-01-01
Abstract
The nonlinear dynamic response of carbon nanotube (CNT)/polymer nanostructured hysteretic beams is investigated with the aim of achieving optimal nonlinear material designs in terms of maximum multistability bandwidth. Leveraging on multistability is indeed regarded nowadays as an additional functionality for smart multifunctional structures in a variety of engineering applications, with the potential of promoting a growing aerodynamic morphing demand. Optimal solutions are found employing asymptotically obtained Frequency Response Curves (FRC) over a certain range of excitation frequencies, by varying the meaningful nanostructured beams parameters, such as the CNT/polymer interfacial shear strength, the CNT volume fraction, direction and agglomeration, the CNT functionalization through the cross-section thickness. Both accuracy and efficiency are attained through a nonlinear hysteretic beam model, obtained by reduction of a 3D mesoscopic theory, subsequently treated via the method of multiple scales to yield the asymptotic dynamic response. The richness of the optimal solutions is induced by the unusual and unique combination of material and geometric nonlinearities, the former associated with the interfacial frictional sliding that yields hysteresis, the latter with stretching nonlinearities of the beam itself.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
