摘要
统计分析了某电液伺服阀13个失效弹簧管的开裂情况(包括弹簧管的应用、开裂位置、裂纹扩展方向以及开裂方式的规律性)。采用外管分析、断口分析和金相组织分析等方法,研究了弹簧管断裂特征与机理。结果表明:弹簧管的开裂原因包括较大的疲劳应力、材质和加工因素。夹杂物在弹簧管冷拉成型过程中沿轴向分布,在周向打磨过程中沿夹杂物形成裂纹。
The crack conditions of 13 bourdon springs of electrohydraulie servo valve were analyzed, including crack position, crack orientation and the crack regularity. Using the methods of macrography observation, fracture surface analysis and metallic phase analysis, the fracture characteristics and mechanism of bourdon springs were studied. The results showed that, main failure reasons included： larger stress, material quality and process. The inclusion distribute was axial because of hard-drawing, crack was formed following the inclusion during the process of circumferential dressing.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2012年第8期10-13,共4页
Journal of Materials Engineering
关键词
弹簧管
电液伺服阀
失效规律
失效原因
bourdon spring
electrohydraulic servo valve
failure regularity
failure cause
