Low Cycle Fatigue Simulation Of30Cr1Mo1V And12Cr In High Temprature And Damage Assessment

As one of the most important part of the turbine, the rotor of the turbine works in inhigh temperature, high pressure and variable conditions.At the same time,the variablethermal stress will make large low-cycle fatigue on the rotor of the turbine when the turbineis in the process of shutdown and startup.Therefore,it is significant to research the featureof the low-cycle about the turbine rotor in high temperature and to evaluate its life.We canget the equation of the life about the low-cycle fatigue from which we can simulate theprocess of the damage about the turbine rotor by the method of finite element.Thus theaccuracy of evaluating the life of the turbine rotor has been largely improved.Above all,the article researches some kind of materials(30Cr1Mo1V and12Cr) whichhave been generally used in the rotor of super critical turbine.Firstly, the article introducesthe processes and results of the low-cycle fatigue tests in high temperature,and according towhich,this article derive the variation of some physical parameter in the processes oflow-cycle fatigue.Then the article introduces the relationship between the hardness and thelife about the rotor of super critical turbine.At last,we used the finite element softwareMSC.MARC to simulate the process of the low-cycle fatigue experiment and to calculatethe damage about the square plate with a hole in it from which we get the damage evolutionabout the plate in different conditions.At the same time, the article compare its results to theresult of the linear method about the miner.The feature of this article are the simulation use the dates of the low-cycle fatigue testsand consider the variation of some physical parameter in the processes of low-cycle fatiguetests.