INVESTIGATING THE STRESS-STRAIN STATE OF A TURBOJET ENGINE UNDER HIGH-TEMPERATURE CONDITIONS

Abstract

This article investigates the development and methodology of a high-temperature strain gauge (HTS) designed to monitor the stress-strain state (SSS) of structures operating under extreme thermal conditions (650–700 °C). The primary objective is to scientifically substantiate and practically test an HTS capable of measuring deformation parameters with high accuracy during intense heating. To achieve this, the study introduces an innovative design for the sensitive elements (SE): a rectangular socket configuration featuring vertical integration ("one above the other") within a specialized high-temperature cement binder. This engineering solution enables the simultaneous, accurate recording of longitudinal and transverse deformations, effectively identifying the force vector on the test object. The research combines numerical modeling using finite element analysis (FEA) in ANSYS with full-scale physical experiments, demonstrating a high degree of data convergence. The operability and efficiency of the developed device were validated by analyzing the SSS of a bracket that secures the flame tube fairing in a gas turbine engine combustion chamber. During bench tests across all standard operating modes, these strain gauges provided a comprehensive assessment of the unit's strength and reliability. Ultimately, the proposed HTS design and methodology offer an effective and reliable tool for monitoring critical aircraft engine components. Practical implementation of this technology supports real-world measures to optimize and extend the service life of engineering structures, confirming its value in modern testing practices.