Numerical Study On The Mechanical And Electrical Properties Of PZT95/5Ferroelectric Ceramic Under Shock Wave Loading

Bound charges of PZT95/5ferroelectric ceramics with polarization will be released by shock wave loading, to form a high-power electrical energy output, which is very important and applied in the defense industry. However, PZT95/5ceramic may be damaged and destroyed on mechanics or broke out on electricity, then PZT95/5ceramic pulse power failed and the stable power cannot be output. So, studying on the mechanical and electrical properties of PZT95/5ceramic under shock loading important, which is very important for recognizing PZT95/5ceramic performance and improve their utilization. For this reason, kinetic and electrical properties of PZT95/5ceramics under shock wave load were study by the numerical simulation in this paper. The main work of this paper as follows:1The kinetic properties of PZT95/5ferroelectric ceramic were analyzed by using numerical simulation method. The explicit finite element analysis software ANSYS/LS-DYNA was used and the JH-2ceramic material dynamics model was chose as the kinetic model. The JH-2model parameters of PZT95/5ceramic were calculated by means of the experimental results of the U.S. Sandia Laboratory and the Chinese Academy of Engineering Physics. The process of alumina (Al2O3) ceramic impact PZT95/5ceramic at different speeds was simulated, and the particle velocity history curves of free surface of PZT95/5ceramic was given. The simulation results were comparing with the experiment results, and the reason for the difference was analyzed.2The transient discharge process and characteristics of PZT95/5ferroelectric ceramic with polarization was analyzed. For a shock loading perpendicular to the polarization direction, a model describing the depolarization and discharge process of PZT95/5ferroelectric ceramic by normal shockwave is proposed. The effects of Shockwave pressure on the wave velocity and the depolarization phase transition process are considered systematically in our study. The PZT95/5ferroelectric ceramics depoling process is analyzed by a parallel circuit with a current source, a capacitance and a conductance, and the circuit load. The effects of changes in the dielectric constant and conductivity during shock loading are taken into consideration.3The output current characteristics of ferroelectric ceramics discharge process in the short-circuit and resistive load conditions, the effects of changes in the dielectric constant and conductivity are analyzed by using the model and compared with the experimental results. The results show that, the present theoretical model can predict well the discharge process of PZT95/5ferroelectric ceramics under shock compression.