STUDY ON THE FATIGUE DAMAGE OF A ROTOR UNDER OIL-WHIP BY CONTINUUM DAMAGE MECHANICS

Jing Jianping  Meng Guang

(The State Key Laboratory of Vibration，Shock and Noise, Shanghai Jiaotong University, Shanghai 200030)

Sun Yi  Xia Songbo

(Department of Astronautics and Mechanics, Harbin Institute of Technology, Harbin 150001)

Abstract: Based on the analysis of the oil-whip of rotor by nonlinear dynamics, the responses are added to the FEA model of rotor as boundary conditions. The damage variable is introduced into the constitution equation and the interactive effects of damage and stress and strain are considered. The evolution of the rotor under oil-whip is analyzed by this coupled-damage method and the failure machinery of the rotor under oil-whip is discussed. Simultaneously, the effects of the coupling function of the stress, strain and damage to damage evolution of rotor are also studied. Finally, some conclusions are given to support the catastrophe prevention and safe design of steam turbine generator.

Key words: Rotor  Oil whip  Fatigue  Damage mechanics

CLC No: TK263.6

国家863计划(2002AA412410)及中国博士后基金(2003033299)资助项目. Received 20030411, received in revised form 20031205