Investigation of the possibility of using the gauge factor to improve the accuracy of strain gauging of loaded elements of turbomachines

Blade strain gauging is one of the most widespread methods for determining the stress-strain state of loaded turbomachinery elements in various sectors of power engineering. Its application is based on the use of special measuring sensors — strain gauges — that allow determination of frequency and strength characteristics over most of the blade body. Strain gauging using strain gauges has found wide application in extractive industries, aviation, and stationary power engineering due to its ease of use and high measurement accuracy. In the latter case, it is used to determine the stress-strain characteristics of various loaded turbomachinery elements (shafts, blades, etc.). However, before using strain gauges it is necessary to calibrate them, which involves the use of special calibration systems designed for this purpose.

In modern strain gauge production, an important role is played by the determination of the gauge factor — a parameter that allows one to determine the amount of change in the sensor’s resistance due to deformation. Its use eliminates the need for calibration of measuring sensors, which simplifies measurement systems and increases the accuracy of the results obtained. For effective use of the gauge factor, it is also necessary to understand the factors influencing the accuracy of equipment readings.