Characters Of Cement-based Piezoelectric Smart Devices

In recent years, with the rapid growth of smart materials and structures in civil engineering applications, cement-based smart composites have become one of the frontiers in smart materials research. Cement-based piezoelectric composite is one of cement-based smart composites.It is a new functional composite materials developed in recent.In the civil engineering field, concrete is the most widely used structural materials. Research and development of the smart materials that have good compatibility with concrete is important. Cement as smart materials matrix, piezoelectric ceramic materials as mixed function body, can form cement-based piezoelectric smart composites with good compatibility in concrete. The piezoelectric elements using cement-based piezoelectric smart composite materials can overcome many problems of traditional piezoelectric elements in civil engineering applications.There are many problems to be solved in the theoretical analysis of cement-based piezoelectric smart composites or devices, such as the establishment of analysis models and analytical solutions obtained. To address the above problems, a systematic study has been carried out in this work the main contents include:1)the models of 0-3,2-2 and sandwich cement-based pezoelectric smart devices are established. Analysis methods are given to find the analytical solutions for the smart devices; 2) The effects of the piezoelectric phase, material parameters, piezoelectric ceramic powder volume ratio, the polarization direction of piezoelectric patches, load type, load frequency on the characters of devices are discussed.3)The numerical results and experimental results are compared.This work gives the analysis models and exact analysis of 0-3,2-2 and sandwich cement-based piezoelectric smart devices, and provides theoretical guidance for the rational design of 0-3,2-2 and sandwich cement-based piezoelectric smart devices. It has great significance to cement-based piezoelectric smart devices in civil engineering applications.