The theoretical model of 1-3-2 piezocomposites

A theoretical model is proposed to calculate the equivalent model the electromechanical properties of (1-3-2) piezocomposite. Piezoelectric equations of state were derived in terms of equivalent parameters based on linear electromechanical response and uniform field theories. Equivalent parameters (g₃₁, g₃₃, beta₃₃, d₃₁, d₃₃, epsiv₃₃) of 1-3-2 piezocomposite were obtained. The computed g₃₁ is -19.9 x 10^-3 Vmiddotm/N^-1, g₃₃ is 68.4 x 10^-3 Vmiddotm/N^-1, d₃₁ is -98 x 10^-12 C/N, d₃₃ is 336 x 10^-12 C/N, and epsiv/^T ₃₃//epsiv₀ is 555, while the volume fraction of piezoelectric phase nu₁ is 0.4 and nu₂ is 0.1. The variation of composite properties with volume fraction of piezoelectric phase have been modeled and experimentally verified. The computed d₃₁, d₃₃, and epsiv₃₃ are within 12.5, 6.7, and 8.4% of experimental values, respectively.