Low Cycle Fatigue Simulation Of Rotor Steel 30cr2mov In High Temprature And Damage Assessment

As one of the weakest parts about life loss in plants, the turbine rotor works in high temperature, high pressure and high-speed. Temperature gradient, load fluctuations and the centrifugal force easily make the rotor a greater plastic deformation and further result in greater life loss. It is significant to evaluate the damage of rotor accurately. It makes possible to evaluate the damage of the rotor that Virtual experimental methods, finite element technology and energy theory have comed forth. It can simulate the low cylce fatigue tests in high temprature using Finite element technology and Virtual experimental methods, replace the original experimental process, provide rich experimental data and shorten the experiment time;the application of enery theory in damage evaluation can characterize the coupling of fatigue and creep and evaluate the low cycle fatigue damage of the turbine rotor in high temprature accurately.This article depends on the above computational method and theory, takes the rotor steel 30Cr2MoV as the researh object, first introduced its creep behavior in high temperature, low cycle fatigue performance, calculation principle of thermal elastic-plastic and creep constitutive model. On this basis, this model has been realized by the re-development function of the finite element software MSC.MARC, and has been confirmed ; Next, in order to simulate the rotor steel fatigue test in high temperature, the finite element model of fatigue sample has been established according to the national standards, the material performance's damage characteristic has been analysised in detail and been joined to the definition model, then this model simulates the low cycle fagitue experiment process, the results have been analysized and confirmed; Finally, it established the damage evaluation model about 30Cr2MoV rotor steel using the low cycle fatigue experiment results in high temperature, and combining energy damage evaluation theory, it calculated the damage field about square plate with a hole in it, compared with the different damage evaluation methods using the model established, and analyzed this model's flaw, in order to provide the ideas for consummating the model next.It constitutes characteristics of this article that combining the virtual experiment technology with the damage assessment method of energy theory, coupling the damage computation and the material performance analysis, closely unifying the implement of elastical-plastic model with the re-development functions of marc.