As a new actuators piezoelectric fiber composites is like a sandwich comprised of interdigitated electrodes, polymer and piezoceramic fibers. A series of piezoelectric unit’s equations about longitudinal length extension vibration mode are set up. According to the dynamic FEM equations for piezoelectric actuator, which are established by means of Lagrange function and Hamilton principle, a series of finite models are built. The performance of mechanics and electrics is analyzed in detail. The distribution of stain, stress and electrostatic field inside the PFC actuators is given by FEM. Influence of geometry parameters and material properties on the lengthways strain and stress are studied. In addition, effect of space and width of IDE and affiliated polymer on the electrostatic field are invested. The results show that PFC actuators perform well when the distance between IDE and fibers is zero and conductive polymer is used as affiliated polymer.
Explosion of landmines is recognized as one of the vital threat to armoured vehicles. The detonation of mines may also threaten the survivability of the occupants inside the vehicle by the high intensive blast waves transmitting from vehicle structures. Bottom add-on modules can be very useful to vehicle in blast protecting. The dynamic response of three different add-on structures under bottom explosion was analysed by simulations and experiments. The optimal structure was obtained by computational results and experimental results, and the protection mechanism was summarized based on the research.
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