ER/MR Smart Structures for Shock Wave Reduction

Abstract

This paper demonstrates the possibility of the shock wave reduction of ER/MR smart structures. ER (electrorheological) and MR (magnetorheological) fluids are smart materials of which stiffness and damping properties can be controlled by applying electric or magnetic fields, respectively. Thus, when ER or MR fluid is inserted into a structure and an appropriate magnitude of electric or magnetic field is applied, propagating waves can be selectively isolated. To experimentally verify the shock wave reduction, a wave transmission test set is made by using piezoceramic transmitter and receiver on a large aluminum plate. The wave transmission characteristics of ER/MR inserts are investigated in terms of field strength and the wave frequency as well. Since the use of ER/MR smart structures has merits in terms of lightweight and controllability, this technology can be used for many applications-impact resistance system for civil and warship structures.