Definition of Terms (.pdf)

Symbol Definitions

A = Area of one electrode, meter²

C = Capacitance, farads

t = Thickness, meter

L = Length, meter

D = Disc diameter (meter)

K^T₃ = Unrestrained dielectric constant in the direction of poling (a frequency of 1000 Hz is used for this measurement), dimensionless

d₃₃ = Parallel strain or change constant, (meter/volt) or (coulomb/newton)

g₃₃ = Parallel voltage constant, (volt x meter/Newton) or (meter²/coulomb)

d₃₁ = Transverse strain or charge constant, (meter/volt) or (coulomb/newton)

g₃₁ = Transverse voltage constant, (volt x  meter/newton) or (meter²/coulomb)

d_h = Hydrostatic strain or charge constant, (meter/volt) or (coulomb/newton)

g_h = Hydrostatic voltage constant, (volt x meter/newton) or (meter²/coulomb)

k_p = Planar coupling factor, dimensionless

k₃₃ = Thickness coupling factor, dimensionless

k₃₁ = Transverse coupling factor, dimensionless

k₁₅ = Shear coupling factor, dimensionless

f_r = Frequency of minimum impedance (Resonant Freq), Hz

f_a = Frequency of maximum impedance (Antiresonant Freq), Hz

S^E₁₁ = Transverse elastic compliance constant at constant field, (meter²/newton)

S^E₃₃ = Thickness elastic compliance constant at constant field,  (meter²/newton)

S^D₁₁ = Transverse elastic compliance constant at constant electric displacement (meter²/newton)

S^D₃₃ = Thickness elastic compliance constant at constant electric displacement (meter²/newton)

Y^E₁₁ = Transverse Young’s Modulus at constant electric field (newton/meter²)

Y^E₃₃ = Thickness Young’s Modulus at constant electric field (newton/meter²)

r = Density (kilogram/meter²)

Z_r. = Minimum impedance (ohms)