A highly deformable rod, modelled as the extensible elastica, is connected to a movable clamp at one end and to a pin sliding along a frictionless curved profile at the other. Bifurcation analysis shows that axial compliance provides a stabilizing effect in compression, but unstabilizing in tension. Moreover, with varying the contraint’s curvature at the origin and the axial vs bending rod’s stiffness, in addition to possible buckling in tension, the structure displays none, two, or even four bifurcation loads, the last two associated only to the first buckling mode in compression. Therefore, the straight configuration may lose and recover stability one or two times, thus evidencing single and double restabilization, a feature never observed before. By means of the closed-form solution for the extensible elastica, the quasi-static behaviour of the structure is analytically described under large rotations and axial strain. The presented solution is exploited, together with an ad hoc developed optimization algorithm, to design the shape of the constraint’s profile necessary to obtain a desired force–displacement curve, so to realize a force-limiter or a mechanical device capable of delivering a complex force response upon application of a continuous displacement in both positive and negative direction

Double Restabilization and Design of Force–displacement Response of the Extensible Elastica with Movable Constraints / Koutsogiannakis, P.; Bigoni, D.; Dal Corso, F.. - In: EUROPEAN JOURNAL OF MECHANICS. A, SOLIDS. - ISSN 0997-7538. - 2022:104745(2022), pp. 1-21. [10.1016/j.euromechsol.2022.104745]

Double Restabilization and Design of Force–displacement Response of the Extensible Elastica with Movable Constraints

Koutsogiannakis, P.;Bigoni, D.;Dal Corso, F.
2022-01-01

Abstract

A highly deformable rod, modelled as the extensible elastica, is connected to a movable clamp at one end and to a pin sliding along a frictionless curved profile at the other. Bifurcation analysis shows that axial compliance provides a stabilizing effect in compression, but unstabilizing in tension. Moreover, with varying the contraint’s curvature at the origin and the axial vs bending rod’s stiffness, in addition to possible buckling in tension, the structure displays none, two, or even four bifurcation loads, the last two associated only to the first buckling mode in compression. Therefore, the straight configuration may lose and recover stability one or two times, thus evidencing single and double restabilization, a feature never observed before. By means of the closed-form solution for the extensible elastica, the quasi-static behaviour of the structure is analytically described under large rotations and axial strain. The presented solution is exploited, together with an ad hoc developed optimization algorithm, to design the shape of the constraint’s profile necessary to obtain a desired force–displacement curve, so to realize a force-limiter or a mechanical device capable of delivering a complex force response upon application of a continuous displacement in both positive and negative direction
2022
104745
Koutsogiannakis, P.; Bigoni, D.; Dal Corso, F.
Double Restabilization and Design of Force–displacement Response of the Extensible Elastica with Movable Constraints / Koutsogiannakis, P.; Bigoni, D.; Dal Corso, F.. - In: EUROPEAN JOURNAL OF MECHANICS. A, SOLIDS. - ISSN 0997-7538. - 2022:104745(2022), pp. 1-21. [10.1016/j.euromechsol.2022.104745]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/356726
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