弯扭交变载荷作用下变桨轴承套圈材料的断裂寿命研究
Research on fracture life of pitch bearing ring material under bending and torsional alternating loads
毛华萍 1刘晓玲 1朱鹏飞2
作者信息
- 1. 阿克苏职业技术学院 机电工程学院,新疆 阿克苏 843100
- 2. 第三师图木舒克职业技术学校,新疆 图木舒克 843900
- 折叠
摘要
变桨轴承套圈在服役过程中会发生断裂,其主要原因是套圈存在微裂纹,在弯扭交变载荷作用下裂纹以不同疲劳方式不断扩展直至断裂.为此,对标准试件进行裂纹扩展,反映变桨轴承套圈失效位置的断裂过程和寿命.确定了套圈断裂位置的等效载荷谱及裂纹扩展模型,根据变桨轴承所承受的纯机械疲劳建立裂纹扩展速率模型,计算标准试件在弯扭交变载荷作用下,裂纹以机械疲劳方式扩展的路径和寿命.裂纹扩展仿真结果表明,裂纹在以机械疲劳方式扩展下,含有微裂纹的变桨轴承套圈能达到使用寿命,考虑腐蚀与疲劳同时作用导致变桨轴承套圈失效.
Abstract
The main reason for the fracture of pitch bearing rings during service is microcracks in the rings,which continue to expand in different fatigue ways until they break under the action of bending torsional alternating loads.For this reason,crack propagation was performed on the standard specimen to reflect the fracture process and life of the failure location of the pitch bearing ring.The equivalent load spectrum and crack growth model of the ferrule fracture position were determined,and the crack growth rate model was established according to the pure mechanical fatigue experienced by the pitch bearing,and the path and life of the crack propagation under the action of bending torsion alternating load were calculated.The crack growth simulation results showed that under the mechanical fatigue propagation of cracks,the pitch bearing rings containing microcracks could reach the service life,and the pitch bearing rings fail due to the simultaneous effects of corrosion and fatigue.
关键词
变桨轴承/标准试件/机械疲劳/裂纹扩展速率模型Key words
pitch bearing/standard specimen/mechanical fatigue/crack growth rate model引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据