Abstract
The variational formulation of an elastic rod with an impenetrable surface surrounding the centerline corresponds to a nonsmooth optimization of cost functional \(\mathcal {J}\) with nonconvex inequality constraints and so presents many analytical and computational challenges in approximating the minima. We construct a sequence of approximate variational cost functionals \(\mathcal {J}_k\), corresponding to elastic rods with infinite energy barriers that enforce impenetrability constraints. Using this construction, we show strong convergence of minimizing configurations of \(\mathcal {J}_k\) to the minimizer of \(\mathcal {J}\) and weak* convergence in \([C(0,1)]^*\) of contact forces induced by the repulsive potential to the contact forces of the minimizing configurations of \(\mathcal {J}\).
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The authors thank Stuart Antman and Boris Mordukhovich for fruitful conversations.
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Communicated by Irena Lasiecka.
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Hoffman, K.A., Seidman, T.I. Approximation of an Elastic Rod with Self-Contact. J Optim Theory Appl 192, 1001–1021 (2022). https://doi.org/10.1007/s10957-022-02002-5
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DOI: https://doi.org/10.1007/s10957-022-02002-5