MACS couple elastic and magnetic potentials using micro- and macro-structure to produce novel material properties and behaviors.


Magneto-Active vs. Magneto-rheological Elastomers

Our work in the area began with Magnetorheological elastomers (MREs), a novel class of smart materials comprised of magnetic particles in a non-magnetic rubbery matrix. MREs are able to change their apparent shear stiffness and exhibit some magnetostriction under the influence of magnetic fields, which has many controls applications. Traditional MREs, however, use soft magnetic filler powders.

Our work examines the use of novel hard-magnetic filler particles as well as soft magnetic fillers to create composites in four classifications, seen at left. The aligned-anisotropic materials present with actuation capabilities fundamentally different from previous MREs, hence the new term "magneto-active". Our materials provide fully reversible large deformation behavior of which traditional MREs are incapable.


 

Piezomagnetic Composites

An alternating laminate like the one shown simulated at left is currently being examined for its unique piezomagnetic behavior. Composites with specified particle and magnetization alignments as well ascvolume fractions and aspect ratios show strain behavior that is linear and reversible with applied field.