One edge of an elastic rod is inserted into a friction-less and fitting socket head, whereas the otheredge is subjected to a torque, generating a uniformtwisting moment. It is theoretically shown andexperimentally proved that, although perfectlysmooth, the constraint realizes an expulsive axialforce on the elastic rod, which amount is independentof the shape of the socket head. The axial forceexplains why screwdrivers at high torque havethe tendency to disengage from screw heads anddemonstrates torsional locomotion along a perfectlysmooth channel. This new type of locomotion findsdirect evidence in the realization of a ‘torsional gun’,capable of transforming torque into propulsive force.

Torsional locomotion / Bigoni, Davide; Dal Corso, Francesco; Misseroni, Diego; Bosi, Federico. - In: PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON. SERIES A. - ISSN 1364-5021. - STAMPA. - 470:2175(2014), pp. 20140599.1-20140599.7. [10.1098/rspa.2014.0599]

Torsional locomotion

Bigoni, Davide;Dal Corso, Francesco;Misseroni, Diego;Bosi, Federico
2014

Abstract

One edge of an elastic rod is inserted into a friction-less and fitting socket head, whereas the otheredge is subjected to a torque, generating a uniformtwisting moment. It is theoretically shown andexperimentally proved that, although perfectlysmooth, the constraint realizes an expulsive axialforce on the elastic rod, which amount is independentof the shape of the socket head. The axial forceexplains why screwdrivers at high torque havethe tendency to disengage from screw heads anddemonstrates torsional locomotion along a perfectlysmooth channel. This new type of locomotion findsdirect evidence in the realization of a ‘torsional gun’,capable of transforming torque into propulsive force.
2175
Bigoni, Davide; Dal Corso, Francesco; Misseroni, Diego; Bosi, Federico
Torsional locomotion / Bigoni, Davide; Dal Corso, Francesco; Misseroni, Diego; Bosi, Federico. - In: PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON. SERIES A. - ISSN 1364-5021. - STAMPA. - 470:2175(2014), pp. 20140599.1-20140599.7. [10.1098/rspa.2014.0599]
File in questo prodotto:
File Dimensione Formato  
torsionallocomotion_PRSA2014.pdf

accesso aperto

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Creative commons
Dimensione 1.42 MB
Formato Adobe PDF
1.42 MB Adobe PDF Visualizza/Apri

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: http://hdl.handle.net/11572/114519
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 22
  • ???jsp.display-item.citation.isi??? 18
social impact