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Thuis > Over ons > MODES OF VIBRATION FOR PIEZOELECTRIC ELEMENTS

MODES OF VIBRATION FOR PIEZOELECTRIC ELEMENTS

table 1-8



table1-82



SYMBOL

DEFINITION

UNITS

ε 33 T , ε 11 T

Free Relative Dielectric Constant

ε 33 S , ε 11 S

Clamping Relative Dielectric Constant

tgδ

Dissipation Factor at Low Field

ρ

Density

g/cm 3

T c

Curie Point

ºC

V

Velocity

m/s

Z a

Accoustic Impedance

Mrayl

K p, K 33, K t, K 31, K 15

Electromechanical Coupling Factors

N p , N 33, N 31, N 15, N t, N c

Frequency Constants

Hz - m

d 33, d 31, d 15

Piezoelectric Strain Constants

10 -12 C/N

d h

Hydrostatic Piezoelectric Strain Constants

10 -3 Vm/N

Q pm

Mechanical Quality Factor at Planar mode

Y 11 E , Y 33 E

Young's Modulus under Short Circuit

10 10 N/m 2

σ

Poisson Ratio

ε 33 T (% Per Decade)

Aging Rate of Free Relative Dielectric Constant

K p (% Per Decade)

Aging Rate of Planar Electromechanical Coupling Factor

K t (% Per Decade)

Aging Rate of Coupling Factor at Thickness mode

N p (% Per Decade)

Aging Rate of Frequency Constant of Planar Mode

N t (% Per Decade)

Aging Rate of Frequency Constant at Thickness Mode

ε 33 T ( / o C)

Thermal Stability of Free Relative Dielectric Constant

GLOSSARY

BT

Barium Titanate

Hard PZT

Hard Lead Titanate Zirconate Compound

Soft PZT

Soft Lead Titanate Zirconate Compound

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Sun Zhaohai

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