摘要
水轮发电机制动环的开裂是由于制动时表面温度过高,效应力过大,从而导致热疲劳破坏,其上的清灰槽产生了高应力集中,加速了疲劳断裂。从抗热疲劳的角度提出了改进设计和选材的方法。
The fracture of hydrogenerator's brake-rings is resulted from excessively high temperature and unduly large thermal stress in their surfaces at braking, leading to thermal fatigue fracture. The thermal fatigue fracture produced in powder- clearing grooves of the brake-rings is accelerated by high stress concentration. The methods of improving design of hydrogenerators and selecting their materials are presented in order to control the thermal fatigue.
出处
《大电机技术》
北大核心
1992年第5期13-16,共4页
Large Electric Machine and Hydraulic Turbine
关键词
制动环
热应力
热疲劳
疲劳断裂
brake--rings
thermal stress
thermal fatigue
fatigue fracture
