Magnetically-induced buckling of a whirling conducting rod with applications to electrodynamic space tethers

Details Magnetically-induced buckling of a whirling conducting rod with applications to electrodynamic space tethers Magnetically-induced buckling of a whirling conducting rod with applications to electrodynamic space tethers

2008-10-20

arxiv.org/abs/0810.3668v1

Mathematics

Dynamical Systems

Scientific paper

We study the effect of a magnetic field on the behaviour of a slender conducting elastic structure, motivated by stability problems of electrodynamic space tethers. Both statical (buckling) and dynamical (whirling) instability are considered and we also compute post-buckling configurations. The equations used are the geometrically exact Kirchhoff equations. Magnetic buckling of a welded rod is found to be described by a surprisingly degenerate bifurcation, which is unfolded when both transverse anisotropy of the rod and angular velocity are considered. By solving the linearised equations about the (quasi-) stationary solutions we find various secondary instabilities. Our results are relevant for current designs of electrodynamic space tethers and potentially for future applications in nano- and molecular wires.

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