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Exact travelling-wave solutions of an integrable equation arising in hyperelastic rods. (English) Zbl 1074.74541

Summary: In this paper, we study an integrable nonlinear evolution equation which arises in the context of nonlinear dispersive waves in hyperelastic rods. To consider bounded travelling-wave solutions, we conduct a phase plane analysis. A new feature is that there is a vertical singular line in the phase plane. By considering equilibrium points and the relative position of the singular line, we find that there are in total three types of phase planes. The trajectories which represent bounded travelling-wave solutions are studied one by one. In total, we find there are 12 types of bounded travelling waves, both supersonic and subsonic. While in literature solutions for only two types of travelling waves are known, here we provide explicit solution expressions for all 12 types of travelling waves. Also, it is noted for the first time that peakons can have applications in a real physical problem.

MSC:

74H45 Vibrations in dynamical problems in solid mechanics
74B20 Nonlinear elasticity
74K10 Rods (beams, columns, shafts, arches, rings, etc.)
35Q72 Other PDE from mechanics (MSC2000)
74H05 Explicit solutions of dynamical problems in solid mechanics
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References:

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