Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 68: Poster: Complex Fluids, Glasses, Granular

DY 68.5: Poster

Donnerstag, 15. März 2018, 15:30–18:00, Poster A

Measuring the buckling of a chain of permanent magnets under load – comparison with the elastica model — •Lucas Bartosch, Ingo Rehberg, and Reinhard Richter — Experimentalphysik 5, Universität Bayreuth

A one-dimensional chain of spherical neodymium-iron-boron magnets responds to mechanical loadings in a manner reminiscent of an elastic rod, which was recently described by introducing an effective magnetic bending stiffness [1]. We are investigating the deformation of such a chain resting on a plain by means of images recorded by a digital camera. The positions of the magnets are extracted utilizing OpenCV for image processing. The distance between the two endpoints of the chain is manipulated via a computer controlled stepper motor. Moreover, the lateral force is recorded with a magnetic insensitive force gauge. We are investigating the shape of such a macroscopic chain using digital image processing and compare it to the classical elastica model. In this comparison we find sneaky deviations around an ideal course of the spheres, which may be caused by friction in-between the spheres [2].

1. D. Vella, E. du Pontavice, C. L. Hall and A. Goriely, Proc. R. Soc. A 470, 20130609 (2013).
2. I. Rehberg, Comment on: "Stability of vertical magnetic chains", by Johannes Schönke and Eliot Fried, Proc. R. Soc. A 473, 20160703 (2017).