Bifurcations in the regularized Ericksen bar model. (English) Zbl 1134.74018

Summary: We consider the regularized Ericksen model of an elastic bar on elastic foundation on an interval with Dirichlet boundary conditions as a two-parameter bifurcation problem. We explore, using local bifurcation analysis and continuation methods, the structure of bifurcations from double zero eigenvalues. Our results provide evidence in support of S. Müller’s conjecture [Calc. Var. Partial Diff. Equ. 1, No. 2, 169–204 (1993; Zbl 0821.49015)] concerning the symmetry of local minimizers of the associated energy functional and describe in detail the structure of primary branch connections that occur in this problem. We give a reformulation of Müller conjecture and suggest two further conjectures based on the local analysis and numerical observations. We conclude by analysing a “loop” structure that characterizes \((k,3k)\) bifurcations.


74G60 Bifurcation and buckling
74K10 Rods (beams, columns, shafts, arches, rings, etc.)


Zbl 0821.49015
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