Page 273 - Mechanics of Microelectromechanical Systems
P. 273
260 Chapter 4
end at a distance h. Known are the cross-sectional dimensions w and t, and
the magnetization m of the magnet.
Answer:
Problem 4.12
A thin sheet is constructed of piezoelectric material of cross-sectional
dimensions w and t, and dielectric constant The piece is polarized over
its thickness direction 3 and is subject to bending moments M that are
applied at its ends. A total strain is measured on one of the sides of the
piezoelectric sheet. Calculate the corresponding voltage that is generated.
Answer:
Problem 4.13
Find the bloc force that has to be applied to a piezomagnetic bloc of
cross-sectional area A and Young’s modulus E. The piece is magnetized
about its height direction by means of a magnetic field H. Also determine the
coupling coefficient. Known are the magnetic charge constant the
magnetic permeability and the magnetic compliance
Answer:
Problem 4.14
A clamped square membrane constructed of SMA with side l and
thickness t is deformed while in martensitic state by application of a uniform
pressure p. A temperature variation, which brings the martensite into
austenite phase, is applied subsequent to removing the initial pressure.
Determine the variation in the maximum deflection. Known are Young’s
modulii in martensitic and austenitic states, and as well as Poisson’s
ratio (Hint: use Eq. (1.233) with the first two terms of the infinite series
expansion.)
Answer:
