33.4. Material Properties

The material properties are defined in Engineering Data.

Following are the material properties for the aluminum shell and rubber boot:

Material Property Material
Aluminum Rubber
Young's Modulus (N/m2)68.9E930E6
Poisson's Ratio0.30.49
Density (kg/m3)27101100

The water density is assumed to be 1000 kg/m3, and its speed of sound is 1500 m/s.

Following are the material properties of the piezoelectric ceramic (PZT8), where the polarization direction is along the element x axis:

Material Property Piezoelectric Ceramic Material
Density (kg/m3)
7600
Orthotropic Elasticity
Young's Modulus X direction = 7.407E+10 Pa
Young's Modulus Y direction = 8.696E+10 Pa
Young's Modulus Z direction = 8.696E+10 Pa
Poisson's Ratio XY = 0.303
Poisson's Ratio YZ = 0.356
Poisson's Ratio XZ = 0.322
Shear Modulus XY = 3.135E+10 Pa
Shear Modulus YZ = 3.289E+10 Pa
Shear Modulus XZ = 3.135E+10 Pa
Dielectric Permittivity (relative) at constant strain
Relative Permittivity X direction = 561
Relative Permittivity Y direction = 904
Relative Permittivity Z direction = 904
Piezoelectric Stress Matrix (See Figure 33.9: Piezoelectric Stress Matrix )

Figure 33.9: Piezoelectric Stress Matrix

Piezoelectric Stress Matrix