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Module 1: Overview of Smart
Materials
Bishakh Bhattacharya and Naciketa Tiwari
Indian Institute of Technology, Kanpur
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:
Magnetostrictive Smart Materials-
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The Constitutive Relationship
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Sensors Developed using Terfenol-D
Magnetostrictive Composites
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Const. Eqn. of Magnetostrictive
Material
Joule Effect: S1 = 1/Ep + dmHVillary Effect: B = dm 1 +
H-stress, S-strain, B - magnetic
,
- ermeabilit d - ma netostrictiveconstant
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(a)Demagnetized State (b) Partial Magnetization
c rrevers e oma n agne za on ec n ca a ura on
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Pre-load springs and permanent magnets are
used to put the piston in the zero-position anda so o re uce ys
eres s. e energz ng coaround the rod is used to activate the
Terfenol-
.
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c(t) = S( + o) + d G i(t) + K e-t/C i2 (t) dt
- strain, S- compliance modulus, - stress,
o pre-stress, magneto-mec ancaconstant, G control parameter,
i(t) control current, - equivalent thermal
parametric constant
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Two approaches are taken to develop such
(a)Development of particulate composite:
er eno - partc es o mcron to su -micron size is dispersed in a
suitableresin and cured to form sensors
as magnetostrictive (MS) sensors.
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Ma netostrictive Dela Line MDL Senso
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onsttutve e atons p
H(x,t) = f(x) I(t) = 1/((a2 + x2) I(t)(H) = s (1-e-H ),
>02
H applied pulsed magnetic f ield, I(t) - applied
, -
conductor and MDL, s - saturation -
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Future of Magnetostricve Materials?
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Ferromagnetic Shape Memory Alloy
Material NiMnGa alloy
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Strain induced in FSMA
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Magnetostrictive
Nanocomposite
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Magnetostrictive
Nanocomposite
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Comparison of Free-Strain between
a Micron-level particulate composite
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M. Anjanappa and Y. Wu, Magnetostrictive particulate,
Smart Materials and Structures, 6, pp. 393-402, 1997.
. . , . . , . . . . ,
A magnetoelastic model for magnetostrictive sensors,Proceedings
of ACTIVE 99, Vol. 2, pp. 1193-1204,December 02-04 1999.
Mcknight, G. and Carman G.P., Oriented Terfenol-DComposites,
Material Transactions, Vol.43 No.5 (2002)pp.1008-1014
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END OF LECTURE 4
