Technology of low-cycle fatigue simulation under nonisothermal loading was developed. It is based on the two models: threeparametric model of cyclic stress-strain curve which determines set of thermomechanical surfaces of plastic strain and damage model. Based on experimental results under isothermal cyclic loading thermomechanical surfaces of cyclic loading were created. Parameters of cyclic stress-strain curves were determined by the processing of the experimental data by the optimization techniques. Parameters of damage model were determined by the least squares method. A program for simulation of specimen tests under nonisothermal cyclic loading was developed for the verification of the proposed models under various types of cyclic loading. Influence of creep and creep rupture strength was taken into account in the simulation of nonisothermal cyclic stressstrain curves and low cycle fatigue respectively. Mathematical simulation of the various experiments in literature of thermomechanical fatigue was carried out for the performing of efficiency of the proposed models and programs.
The technology of the optimal design when designing the structure of the rotor disc for turbomachines is showed. The features of the organization of computer-aided design of gas turbine engine rotor are considered. The calculations of gas turbine engine rotor parts optimal form were made. Structural optimization (shape optimization) was applied to optimal design of compressor disk depending on various factors of loading and optimization criteria.
It was proposed methodology of determining parameters of model of nonisothermal cyclic stress-strain curve. Algorithm of pattern recognition was implemented. It was based on minimization of function of mismatch between experimental results and calculation of three-parameter model curve which depends on Bauchinger’s effect, elastic unloading modulus and scale of transformation of nonlinear part of stress-strain curve. Odkvist’s parameter was used for measure of plastic deformation. Simulation of cyclic stress strain curve was carried out. Results of simulation were compared with experimental data.
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