Abstract
The strain gauge made of a piezoelectric film is proposed. The operation of the gauge is based on the piezoelectric effect: the deformation of the gauge causes an electric potential proportional to the deformation. The gauge consists of piezoelectric layers, covered by metal electrodes and adhesive layers that connect the film layers to a multilayer rectangular bar. Since the piezoelectric film has a small modulus of elasticity, the strain gauge can be used to measure the deformation of structures from soft materials.
Highlights
Analysis of stress-strain state of structures, as a rule, is performed on the basis of measuring deformations on the surface of the body under study
The strain gauge must satisfy the following requirements: The gauge measurements must have temporal and temperature stability; The gauge measurements must have good accuracy; The dimensions of the gauge should be small enough to correctly measure the deformation at the point of the body; The influence of the gauge on the stress-strain state of the body in the vicinity of the point under study should be negligible; The gauge should be of low cost and easy to use; Among the experimental methods of measuring deformations, the most widely used strain gauges based on the idea of Lord Kelvin [1, 2]
Due to the piezoelectric effect, when the plate is deformed, an electric charge appears on its electrodes, which is easy to measure
Summary
Analysis of stress-strain state of structures, as a rule, is performed on the basis of measuring deformations on the surface of the body under study. The conductor subjected to deformation, slightly changes resistance This small change in resistance can be measured. Due to the piezoelectric effect, when the plate is deformed, an electric charge appears on its electrodes, which is easy to measure. If the piezoceramics possesses a strong piezoelectric effect, a significant part of the mechanical deformation energy transforms into electrical energy. The elastic compliance of piezoceramics is a quantity of the same order as the elastic compliance of aluminum Such a gauge will distort the stress-strain state at the studied point of the deformable body from a soft material with a small modulus of elasticity
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