Critical Zone Approach for Structural Integrity of Power Engineering Components
This study is concerned with assessing the integrity of cracked steam turbine rotors components which operate under cyclic loading conditions.Damage accumulation and growth have occurred on the inner surface of slot fillet of key and in a disk and blade rivet attachment.Full-size stress-strain state analysis of turbine disk was performed for different stage of lifetime under considering loading conditions.As a result accumulated damage in critical zones of turbine disks depending on time of loading is defined.The tensile tests were performed for determination the main mechanical properties of disks material after loading history.The smooth and notched specimens were cut out from critical zones of turbine disk with given operating time.The low-cycle fatigue tests were performed with the harmonic test-cycle.Additional tests were performed on special designed program test-cycle, which equivalent to start-stop cycle of turbine disk.An engineering approach to the prediction of residual lifetime of turbine disks which is sensitive to the loading history at maintenance is proposed.Approximate estimations of carrying capacity are presented for the different stress-strain state of steam turbine disks at the operation.
V.N.Shlyannikov
Research Center for Power Engineering Problems of the Russian Academy of Sciences,Kazan,Russia
国际会议
2014 International Symposium on Structural Integrity,ISSI2014(2014国际结构完整性学术会议)
兰州
英文
33-39
2014-08-20（万方平台首次上网日期，不代表论文的发表时间）