Abstract
The stress-strain state analysis of the gas turbine engine compressor disk was carried out taking into account damage accumulation under various loading conditions in the temperature range. Characterization of the constraint effects was performed using the local stress triaxiality h, TZ–factor and In-factors for the various crack sizes and different operation conditions. The distributions of elastic, plastic and creep stress intensity factors were determined by numerical calculation. The results were obtained for several crack front positions, temperature values and disk rotation angular velocity. The differences in the behavior of elastic and nonlinear fracture resistance parameters depending on loading conditions, crack geometry and temperature are demonstrated. The nonlinear stress intensity factors are preferred as fracture resistance parameters of materials and structures.
Highlights
G as turbine engines (GTE) are the main power plants in modern aviation
This study aims to explore elastic and nonlinear fracture resistance parameters and analyse constraint parameters taking into account accumulation of damages under various loading conditions within a temperature range
I n this study, a numerical analysis of an aircraft GTE compressor disc was conducted under operation loading conditions taking into account damage accumulation
Summary
Many types of engines in land and marine engineering are based on GTEs. GTEs are operated under extremely high temperatures and loads for long periods of time. The temperature ranges from -60°C to +1700°C, air pressure can reach 300 MPa, and gas flow rate exceeds the sonic velocity. The main loads are derived from centrifugal forces on the rotating parts of the rotor; a rotation frequency reaches 5000 1/s, and the circumferential speed is –450 m/s. Titanium alloys and stainless steels are often used for highly loaded rotor components, and heat-resistant nickel-based alloys are used for high-temperature turbine components [1, 2]. The discs subjected to centrifugal and thermal loads are the most loaded part of the rotors. This study aims to explore elastic and nonlinear fracture resistance parameters and analyse constraint parameters taking into account accumulation of damages under various loading conditions within a temperature range
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