Dissertation Defense: Static and Dynamic Delta E Effect in Magnetostrictive Materials with Application to Electrically-Tunable Vibration Control Devices

Justin Scheidler, PhD Candidate, Mechanical Engineering

All dates for this event occur in the past.

E525 Scott Lab
E525 Scott Lab
201 W. 19th Ave.
Columbus, OH 43210
United States

Committee:

  • Marcelo Dapino, Chair (Mechanical)
  • Giorgio Rizzoni (Mechanical)
  • Krishnaswamy Srinivasan (Mechanical)
  • Junmin Wang (Mechanical)


Abstract:

Magnetostrictive materials transfer energy between the magnetic and mechanical domains as they magnetize in response to applied stresses and deform in response to applied magnetic fields. The deformation that arises from this coupling directly causes the material's effective elastic moduli to depend on stress and magnetic field. This phenomenon, known as the Delta E effect, can be electrically modulated using electromagnets. The Delta E effect can be harnessed to create devices that have an electrically-tunable stiffness, which have broad application to the field of vibration control. This dissertation advances the state-of-the-art by analytically, numerically, and experimentally investigating the effects of dynamic stress on magnetostrictive materials and by utilizing both static and dynamic elastic modulus changes in the development of novel vibration control devices.