Speaker： Professor Davide Bigoni

University of Trento, Italy 

Chair：Prof. Z.P. Huang （黄筑平教授） 

Time：May 29, Friday, 3:00pm-4:30pm 

Place：Mechanics Building Room 434 （力学楼434会议室）

 

The existence of Eshelby or configurational forces acting on elastic structures is theoretically and experimentally demonstrated [1]. These forces have a strong influence on structural behaviour and a counterintuitive behaviour [2]; they are exploited in two particular cases: the elastica arm scale [3] and the torsional actuator [4]. In the former case, the concept of deformable arm scale (completely different from a traditional rigid arm balance) is theoretically introduced and experimentally validated. The idea is not intuitive, but is the result of nonlinear equilibrium kinematics of rods inducing configurational forces, so that deflection of the arms becomes necessary for the equilibrium, which would be impossible for a rigid system.

In the latter case, torsionally-induced locomotion is demonstrated and is given direct evidence in the realization of a torsional gun capable of transforming torque into propulsive force.

 

[1] D. Bigoni, F. Dal Corso, F. Bosi and D. Misseroni, Eshelby-like forces acting on elastic structures: theoretical and experimental proof. Mech. Materials, 2015, 80, 368-74.

[2] D. Bigoni, F. Bosi, F. Dal Corso and D. Misseroni, Instability of a penetrating blade. J. Mech. Phys. Solids, 2014, 64, 411-425

[3] F. Bosi, F. Dal Corso, D. Misseroni and D. Bigoni An elastica arm scale. Proc. Royal Soc. A, 2014, 470

[4] D. Bigoni, F. Dal Corso, D.Misseroni and F. Bosi, Torsional locomotion. Proc. Royal Soc. A, 2014, 20140599.

 

 

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