This work deals with the experimental testing and the numerical simulation of the impulsive dynamics of a tensegrity lattice. The analyzed system is a column made of ten regular tensegrity prisms, each composed of two solid triangular plates (bases), three cross bars, and three cross cables. Bars and bases are additively manufactured in a titanium alloy, through electron-beam melting, while cross cables are made of Spectra fibers and are added to the titanium structure afterward 3D-printing process. The experimental response of the examined tensegrity column under impact loading is studied by recording the waves traveling through the system by means of a Digital Image Correlation algorithm, which measures the axial displacements of the bases of each unit. We compare the experimental results with those obtained from numerical simulations performed by adopting two different nonlinear elastic models: one accounting for the presence of bending-stiff connections between the 3D-printed elements, and for the resulting mixed bending-stretching regime; the other one being a tensegrity model which describes a purely stretching response of the column. Such a comparison shows that the presence of bending-stiff connections may weaken the nonlinearity of the wave dynamics that is typical of tensegrity lattices with frictionless nodal connections. We also observe that a marked nonlinear behavior occurs in the case of pure-tensegrity response (no bending deformation) under small prestress.

Amendola, A., Fabbrocino, F., Favata, A., Micheletti, A., Fraternali, F., Daraio, C. (2017). Experimental and numerical study of wave dynamics in tensegrity columns. In COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (pp.4796-4809). National Technical University of Athens [10.7712/120117.5762.17728].

Experimental and numerical study of wave dynamics in tensegrity columns

Micheletti, Andrea;
2017-01-01

Abstract

This work deals with the experimental testing and the numerical simulation of the impulsive dynamics of a tensegrity lattice. The analyzed system is a column made of ten regular tensegrity prisms, each composed of two solid triangular plates (bases), three cross bars, and three cross cables. Bars and bases are additively manufactured in a titanium alloy, through electron-beam melting, while cross cables are made of Spectra fibers and are added to the titanium structure afterward 3D-printing process. The experimental response of the examined tensegrity column under impact loading is studied by recording the waves traveling through the system by means of a Digital Image Correlation algorithm, which measures the axial displacements of the bases of each unit. We compare the experimental results with those obtained from numerical simulations performed by adopting two different nonlinear elastic models: one accounting for the presence of bending-stiff connections between the 3D-printed elements, and for the resulting mixed bending-stretching regime; the other one being a tensegrity model which describes a purely stretching response of the column. Such a comparison shows that the presence of bending-stiff connections may weaken the nonlinearity of the wave dynamics that is typical of tensegrity lattices with frictionless nodal connections. We also observe that a marked nonlinear behavior occurs in the case of pure-tensegrity response (no bending deformation) under small prestress.
6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2017
grc
2017
Rilevanza internazionale
2017
Settore ICAR/08 - SCIENZA DELLE COSTRUZIONI
Settore ING-IND/22 - SCIENZA E TECNOLOGIA DEI MATERIALI
English
3D printing; Experimental testing; Impulsive dynamics; Stick-and-spring structure; Tensegrity column
https://2017.compdyn.org/
Intervento a convegno
Amendola, A., Fabbrocino, F., Favata, A., Micheletti, A., Fraternali, F., Daraio, C. (2017). Experimental and numerical study of wave dynamics in tensegrity columns. In COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (pp.4796-4809). National Technical University of Athens [10.7712/120117.5762.17728].
Amendola, A; Fabbrocino, F; Favata, A; Micheletti, A; Fraternali, F; Daraio, C
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/212921
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
social impact