摘要
采用断口形貌、金相检验、硬度测定和化学成分分析等方法对某型号风机基座螺栓断裂进行了分析。结果表明,螺栓的断裂为单向弯曲疲劳断裂。断裂的主要原因是在配合螺母下第一道螺栓螺纹处存在缩松且该处应力集中明显,成为裂纹源,在振动循环弯曲应力的作用下裂纹扩展直至断裂。
The fracture of jacking bolts in a certain type of fan was analyzed by fracture morphology, metallographic examination, hardness testing and chemical composition analysis. The results show that the fracture of the bolt is unidirectional bending fatigue fracture. The main reason for fracture is the shrinkage defects and stress concentration at the first road bolt thread matching with nut, these areas become the crack source, and then extends under the action of vibration cycle bending stress,and fractures finally.
作者
杨国法
余瑾
裴义林
杨兵
晁悠扬
YANG Guofa YU Jin PEI Yilin YANG Bing CHAO Youyang(School of Material Science and Engineering, Hefei University of Technology, Hefei 230009, China Eastman Shuangwei Fiber Company Limited, Hefei 230601, China)
出处
《热加工工艺》
CSCD
北大核心
2017年第2期257-258,262,共3页
Hot Working Technology
关键词
螺栓
断裂
疲劳断裂
失效分析
bolt
fracture
Fatigue fracture
failure analysis
