Properties of compressible elastica from relativistic analogy

Abstract

Kirchhoff's kinetic analogy relates the deformation of an incompressible elastic rod to the classical dynamics of rigid body rotation. We extend the analogy to compressible filaments and find that the extension is similar to the introduction of relativistic effects into the dynamical system. The extended analogy reveals a surprising symmetry in the deformations of compressible elastica. In addition, we use known results for the buckling of compressible elastica to derive the explicit solution for the motion of a relativistic nonlinear pendulum. We discuss cases where the extended Kirchhoff analogy may be useful for the study of other soft matter systems.

6 pages

References in corpus (3)

• Cylindrical equilibrium shapes of fluid membranes
• The role of extensibility in the birth of a ruck in a rug
• Nonlinear buckling and symmetry breaking of a soft elastic sheet sliding on a cylindrical substrate

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