Mixed Mode Elastic-Magnetostrictive Wave Propagation in a Cubic Media

摘要

A preliminary theoretical effort has provided a robust three dimensional energy based model of magnetostrictive wave propagation in a general cubic magnetostrictive material. Under high intensity impact we predict that the wave front will split between a higher velocity elastic precursor wave and a lower velocity, strongly dissipative, magnetostrictive Shockwave. The wave front solution strongly depends on longitudinal pre-stress level and initial magnetization state. We may expect that a significant portion of the magnetostrictive wave deformation will be reversible under the application of well chosen field paths. In combination these technical characteristics therefore present an opportunity to develop magnetostriction based shock hyper-toughness in safety critical civil and military structures utilizing relatively shock tough magnetostrictive materials such as Terfenol-D particle based composites or homogenous Galfenol rods.