Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields.

摘要: Elongations of magnetoactive elastomers (MAEs) under ascending-descending uniform magnetic fields were studied experimentally using a laboratory apparatus specifically designed to measure large extensional strains (up 20%) in compliant MAEs. In the literature, such phenomenon is usually denoted as giant magnetostriction. The synthesized cylindrical MAE samples based on polydimethylsiloxane matrices filled with micrometer-sized particles carbonyl iron. impact both macroscopic shape factor and their magneto-mechanical characteristics evaluated. For this purpose, aspect ratio samples, concentration MAEs effective shear modulus systematically varied. It was shown that magnetically induced elongation cylinders maximum field about 400 kA/m, applied along cylinder axis, grew increasing ratio. effect sample composition discussed terms filler rearrangements observed experimental tendencies are rationalized by simple theoretical estimates. obtained results can be used for design new smart materials magnetic-field-controlled deformation properties, e.g., soft robotics.