The Experimental and Theoretical Procedure for Estimating Resistance of Gas Turbine Engine Flow Path Elements in Special Loading Cases

In solving most engineering tasks the existing availability of identification of elastic properties of materials and simple calculation of the design linear response allow to achieve high reliability of calculated evaluation of the product mechanical behavior when operating in the elastic area. At the same time, the modern requirements for the time and cost of developing complex high-loaded items require a calculated analysis of the design behavior in the presence of plastic deformations, for example, in case of emergency. Description of the plastic deformation is complicated by more significant influence of the deformation rate, temperature, material anisotropy and other factors. The Johnson – Cook analytical model is used to simulate the material behavior under dynamic loading conditions accompanied by the intensive plastic deformation, which takes into account the effect of material loading speed and adiabatic heating for its hardening. It is also possible to use the Johnson-Cook tabulated model, which in comparison with the analytical one is more universal due to the use of the tabular or arbitrary method for setting deformation curves at different levels of deformation rates and temperatures.