Abnormal deformation and negative pressure of a hard magnetic disc under the action of a magnet

Abstract

Intelligent robots are widely used in a wide spectrum of areas, but the underlying mechanism on the operation of actuated structures has not been fully uncovered. In the present study, we have made a comprehensive investigation on the mechanical behaviors of a hard magnetic disc under the action of a magnet. A new technique for preparing the hard magnetic disc is presented. The configurations of the disc after deformation are recoded, which are consistent with the analytical solutions and the numerical simulation results, and the maximum axial displacement of the disk is up to 2.7 mm. The contact force between the disc and the substrate is also calculated, which matches the experimental result very well. The negative pressure of the disc can cause the rise of water column linked with a reservoir (~9.3 mm), which can be explained by the theoretical model. These findings have important implications in such areas as controllable devices, robotics and high-precision measurement.