基于疲劳累积损伤理论的抽水蓄能电站顶盖螺栓疲劳分析  

Fatigue Analysis of Top Cover Bolts of Pumped Storage Power Station Based on Fatigue Cumulative Damage Theory

作　　者：张法 葛新峰[2] 王宁宁 张敬 宋海峰 化洪昌 潘虹[2] 郑圣义[2] ZHANG Fa;GE Xinfeng;WANG Ningning;ZHANG Jing;SONG Haifeng;HUA Hongchang;PAN Hong;ZHENG Shengyi(Huilong Branch of State Grid Xinyuan Hydropower Co.Ltd.,Nanyang 473000,China;College of Energy and Electric engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]国网新源控股有限公司回龙分公司,河南省南阳市473000 [2]河海大学能源与电气学院,江苏省南京市210098

出　　处：《水电与抽水蓄能》2021年第3期78-83,共6页Hydropower and Pumped Storage

基　　金：国家自然科学青年基金项目(51809082);国网新源科技项目(525688170003);河海大学创新创训项目(2020102941177)。

摘　　要：抽水蓄能机组在实际运行中螺栓受力会随着工况的不同而发生改变,而且在重复加载的过程中,螺栓会发生疲劳失效,其疲劳状况直接影响着整个水电站的安全运行。因此,研究各种工况下螺栓的疲劳特性对于水电站安全运行具有重要意义。回龙抽水蓄能电站其之前顶盖螺栓曾发生断裂造成事故,本文结合顶盖螺栓的改造的情况,基于有限元与理论相结合的方法对不同螺栓直径的疲劳特性开展了研究,得到了三种不同直径螺栓在不同工况下的疲劳特性,其中水轮机工况—水轮机飞逸工况此交变工况下的螺栓的疲劳寿命最低,但依然满足疲劳强度的要求,不会发生疲劳破坏,三种直径的螺栓在四种工况转变过程中均为无限寿命,满足疲劳强度的要求。During actual operation of the unit,the stress of the bolt will change with the different working conditions,and during repeated loading,the bolt will fatigue failure,and its fatigue condition directly affects the safe operation of the entire hydropower station.Therefore,studying the fatigue characteristics of bolts under various working conditions is of great significance for the safe operation of hydropower stations.Huilong Pumped-storage Power Plant is caused by fatigue damage of M235 bolts made of Q235 material,which caused flooded workshops.In this paper,the materials and bolt diameters were changed.Based on the combination of finite element and theory,the bolts with different diameters were studied under different working conditions.Fatigue characteristics.It can be obtained that the three bolts under this material meet the fatigue strength limit.

关 键 词：螺栓 疲劳寿命 应力幅 损伤 交变工况 

分 类 号：TK79[动力工程及工程热物理—流体机械及工程]