Abstract
<jats:p>The subject of the study was the development and testing of a high-temperature strain gauge for measuring static and temperature deformations in the blades, disks, and housing elements of gas turbine engines and other power machines operated at temperatures up to 700 °C. A comparison was made with commercial samples of low- and high-temperature strain gauges, and recommendations were presented for research on gas turbine engines at elevated temperatures. The purpose of the study of the article was to develop a strain gauge considering the peculiarities of the operation of elements of gas turbine engines and other power machines, in particular, high temperatures, aggressive environments, and mechanical loads. The task was to propose a design for a strain gauge device that can be used to measure temperature, static, and temperature deformations, and a method for the temperature compensation of imaginary deformations. The deformations were measured by the strain gauge method using a strain gauge device that was mounted on the surface of the disk, which was subjected to temperature stresses. To verify the obtained experimental results, the authors conducted two analytical solutions of the disk strength. The geometric parameters and properties of the disk material, as well as the temperature gradients in it, correspond to the experimental ones. In the first variant of the analytical solution of the thermally stressed state of the disk, a mathematical model of disk loading was used, in the second variant, the solution was performed using FEM in the ANSYS system. The obtained results of the article showed sufficient accuracy and reliability for the strain gauge device when operating at high temperatures. With a temperature gradient of less than 50 °C along the length of the SE, the error does not exceed 400 μm/m. The conclusion shows that the proposed sensor performs sufficient temperature compensation at temperatures up to 700 °C and provides signal stability over time. The practical significance of the work lies in increasing the reliability of diagnostics and forecasting the service life stability of gas turbine plant elements.</jats:p>