Convergence of Voltage in PVDF Sensory Layer
A numerical convergence of voltage analysis has been carried out for a simple problem using a high precision piezoelectric finite element which can be used with a piezoelectric sensory network.
A 225 mm x 150 mm glass-epoxy composite laminate with [04] stacking sequence is covered with PVDF sensing layer of 0.1 mm thickness and spread over half of the top surface. The ply thickness for all the four layers is 0.5 mm. The boundary conditions are shown in the layout [Figure 24.2].
Figure 24.2 Composite laminate with PVDF layer
Details of the parameters used in the numerical analysis are listed in Table 24.1
Table 24.1: Numerical data used in analysis |
Composite |
Glass-epoxy |
Dimensions of the plate |
250 mm x 150 mm |
Stacking sequence |
0/0/0/0 |
Ply thickness |
0.5 mm |
Elastic modulus, E1 |
28.45 GPa |
Elastic modulus, E2 |
2.148 GPa |
Shear modulus, G12 |
1.032 GPa |
Poisson’s ratio, ν12 |
0.21 |
Density, ρ |
1670 kg/m3 |
Sensor |
PVDF film |
Elastic modulus, E1 = E2 |
2.0 GPa |
Poisson’s ratio, ν12 |
0.31 |
Density, ρ |
1800 kg/m3 |
PVDF film thickness |
0.1 mm |
Table 24.1: Details of parameters used in convergence analysis of voltage
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