Performance Analysis Of PZT Smart Module

The safety of the huge buildings such as edifices, bridges, dams and power plants is very important in the civil engineering. The real-time, online, long-term and active monitory on these buildings becomes a necessary task. Based on the previous researches on the PZT embedded concrete smart modules, the characteristics of the stress and temperature responses of the modules are studied through the finite element method and the experiments.Served as the bulk material for the PZT-embedded smart modules, the concrete composite materials are first discussed analyzed on their physical characteristics, which provide the theoretic support for the choice of the coupling material, and the explanation on the experimental results. Starting from the piezoelectric effects, the mechanisms of the piezoelectric ceramics are analyzed. The energy losses in the piezoelectric ceramic materials under different mechanical and temperature ambient are also researched. By deriving the relationship between the equivalent circuit parameters and the physical constants, the technique of stress monitory by PZT embedded concrete smart modules is represented and researched.The finite element model of concrete specimen is established to analyze the characteristics of the PZT ceramic embedded in the concrete. By the simulation, the responses of the embedded ceramic to the different loading, the stress applied on the ceramic, the vary depth of embedment, and the effect of the rubber layer on the PZT ceramic are discussed and analyzed. It is proved to be of the linear relationship between the loading applied on the surface of the concrete and the stress produced in the concrete. Resultantly, the feasibility of the stress monitory by PZT embedded concrete module is also confirmed.In the loading experiment carried on the PZT embedded concrete modules, the loading responses of the equivalent circuit parameters are researched and the value of each parameter is measured. By the relationships between the dissipation factor and equivalent circuit parameters, the energy losses of the PZT ceramics are computed. In the temperature experiments, the equivalent circuit parameters perform different features to that in the loading experiments. Both the mechanisms of stress and temperature responses are explained in microscopic view.