Kahraei K. Determination of vibration stresses in highly heated GTE parts using high temperature film strain gauges

Object - the process of determining the stress-strain state of extremely heated gas turbine engine parts; goal - to provide experimental evaluation of vibration stresses in extremely heated gas turbine engine parts using high-temperature film strain sensors; methods - mathematical modeling of processes taking place in high-temperature film strain sensors during the study vibratory stress of extremely heated gas turbine engine elements, polarization-optical method, finite element method, experimental studies of vibratory stresses in gas turbine engine blades; results - a new method of common determination of vibratory stresses, new production technology and use of high-temperature film strain sensors for experimental determination of vibration stresses in extremely heated gas turbine engine parts; novelty - significantly improved the existing method that measures only the vibration deformation among a common measurement of vibration and temperature stress in extremely heated gas turbine engine parts during testing using the information from strain sensors, film strain sensors with sensitive elements based on platinum group metals with the addition of ceramics were developed for the first time, these sensors allows investigating of vibratory and thermal stressed condition of turbine blades of gas turbine engines operating at 1000 - 1100 °C, a method to assess measurement error of strain-stress state of gas turbine engine parts during their testing was proposed for the first time, it uses polarization-optical method and finite element method and improves assessment of the error, a method of determining the methodological errors arising from bypassing of strain sensor sensing element with layer of binder material got further development and adapted to the specific operating conditions of the extremely heated blades of gas turbine engines; degree of integration - 2 adoptions deed is presented; industry - propulsion engineering.