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Magnetostrictive Response Characterization in Unimorph Composites

Explore magnetostrictive response in Terfenol-D composites, confirming deflection cause and optimizing future iterations.

kiayada-madden
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Magnetostrictive Response Characterization in Unimorph Composites

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Presentation Transcript

  1. Background Information • Magnetostriction first observed in iron by James Joule in 1842. • Magnetostrictive material experiences strain and deformation in direction of applied magnetic field. • Strain response changes when external stress is applied. • Terfenol-D, developed in the 1970s by the Naval Ordinance Laboratory, exhibits the largest known magnetostrictive response at room temperature.

  2. Device and Experiment • Device built around adjustable air gap electromagnet capable of 3000 Gauss with 2 inch gap. • Accommodates data acquisition via optical microscopy or digital image correlation. • Can apply 30 MPa stress to sample. • Testing unimorphTerfenol-D based composite with naturally sourced matrix. • Objectives were to confirm magnetostriction as primary cause of deflection, and characterize sample response. • Classifying criterion established as seen in figure.

  3. Results • Device capable of characterizing magnetostrictive response. • Confirmed magnetostriction as primary source of bending in all unimorph samples. • Can now proceed with assisting sample manufacturer with optimizing composite and testing future iterations.

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