The bidirectionally coupled magnetoelastic model (BCMEM) developed by Mudivarthi et al (2008 Smart Mater. Struct. 17 035005) has been extended to include electric
currents in its magnetic finite element formulation. This enables the model to
capture the magnetoelastic behavior of magnetostrictive materials subjected to
elastic stresses and magnetic fields applied not only using permanent magnets
but also the current carrying coils often used in transducer applications. This
model was implemented by combining finite element solutions of mechanical and
magnetic boundary value problems using COMSOL Multiphysics 3.4 (finite
element modeling software) with an energy-based nonlinear magnetomechanical
constitutive model. The coupling variables are magnetostriction and magnetic
permeability, which are dependent on both the magnetic (magnetic flux density) and
the mechanical (stress) states of a magnetostrictive material. In this research,
the BCMEM was used to simulate actuator load lines for a magnetostrictive
Fe84Ga16
alloy, which were then compared with experimental data (Datta and Flatau 2008
Proc. SPIE 6929 69291Z). Also, the ability of the BCMEM to capture the
ΔE
effect in Galfenol was demonstrated. Finally, the use of the BCMEM as a tool for
transducer design optimization is demonstrated by using the model to visualize
the influence of different magnetic circuit designs on transducer performance.
This paper analyzes a prototype microgyrosensor that employs the magnetostrictive alloy Galfenol for transduction of Coriolis-induced forces into an electrical output for quantifying a given angular velocity. The magnetic induction distribution in the Galfenol sensor patch depends on its bending shape and magnetoelastic properties and is investigated using a finite element model. Fluctuations in magnetic induction caused by a sinusoidal rotation of the sensor produce an amplitude modulated voltage in a surrounding coil which is simulated and measured.
The bidirectionally coupled magnetoelastic model (BCMEM) developed by [1] has been modified to include electric currents in its magnetic finite element formulation. This enables the model to capture the magnetoelastic behavior of magnetostrictive materials subjected to elastic stresses and magnetic fields applied not only by permanent magnets but also by current carrying coils used often in actuator applications. This model was implemented by combining COMSOL Multiphysics 3.4 (Finite Element Modeling software) with an energy-based non-linear magnetomechanical constitutive model. The coupling variables are magnetostriction and magnetic permeability that are dependent on both magnetic (magnetic flux density) and mechanical (stress) properties. In this research, the BCMEM was used to simulate actuator load lines for a magnetostrictive Fe84Ga16 alloy, which were then compared to experimental data [2]. Also, the ability of the model to capture the presence of the ΔE effect in Galfenol was demonstrated using the BCMEM. Finally, the use of the BCMEM to as a tool for transducer design optimization is demonstrated by using the model to visualize the influence of different magnetic circuit designs on transducer performance.
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