Preparation method of full stress sensor based on cement-based piezoelectric composite material element

Abstract

The invention discloses a preparation method of a full stress sensor based on a cement-based piezoelectric composite material element, comprising: the first step, preparing d 15 Mode 1‑3 cement-based piezoelectric composite elements, namely d 15 Pattern elements; second step, preparation d 33 Mode 1‑3 cement-based piezoelectric composite elements, namely d 33 pattern element; the third step, using d 15 pattern elements and d 33 The model element is used to prepare the full stress sensor, which mainly includes: on each of the three adjacent surfaces of the cement matrix, a d 33 pattern elements and a d 15 pattern element; three d's 15 The polarization directions of the mode elements are perpendicular to each other, and the three d 33 The polarization directions of the mode elements are also perpendicular to each other. The total stress sensor prepared by the invention has high sensitivity, wide frequency band response, good anti-interference effect and good compatibility with concrete structures. Embed it inside the concrete structure or paste it on the surface of the concrete structure to measure the total stress of the concrete structure at the same time.

Description

technical field [0001] The invention belongs to the technical field of cement-based piezoelectric composite materials, and in particular relates to a preparation method of a total stress sensor based on cement-based piezoelectric composite material elements. Background technique [0002] In the field of civil engineering, concrete structures are the most widely used civil structures. In the overall life of the concrete structure, the safety and stability of the structure is very important. Therefore, in recent years, more and more attention has been paid to the health monitoring of concrete structures. At present, the sensing elements used in the field of civil engineering are generally mature materials that have been used in other fields, such as optical fibers, piezoelectric ceramics, memory alloys, etc. These materials often have very obvious compatibility problems with concrete, the most important structural material in the field of civil engineering. It cannot reflec...

AI Technical Summary

Problems solved by technology

However, there is currently no effective method that can directly measure the entire stress state inside the concrete structure. If a full-stress sensor that can be directly embedded in the concrete and used for simultaneous measurement of the normal stress and shear stress inside the concrete can be developed, it will be useful for the working state. Stress measurement inside concrete is of great importance

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