摘要
针对某空心风扇叶片叶尖在高循环疲劳试验中异常失效的现象,应力分布测试和振动仿真分析表明应力集中部位与失效位置不符,断口分析结果表明裂纹萌生于叶尖的通气孔封焊部位,磨除进气道封焊层的叶片试验验证表明失效源于叶尖进气道焊接缺陷。基于失效机理分析及验证,确定失效源于加工环节焊接工艺选择不当且焊接控制不良,因此制定了更换封焊工艺为电子束焊和CT检测环节的改进措施。
For the unexpected tip failure of hollow fan blade HCF test,the stress distribution test,vibration simulation and crack analysis were done.The test results indicate that the failure region is not the high stress region,and fracture analysis indicates that the crack initiates from the welding area of the duct in the blade tip.Validation test on the blades without the tip welding shows that the failure is induced by the welding defect in the blade tip duct.Based on the fatigue analysis and test validation,the failure occurs by improper welding method selection and welding process control in the manufacturing process.Consequently,the improved process is applying the EB welding in manufacturing and CT inspection.
作者
刘晓锋
李迪
廖连芳
陈云永
LIU Xiaofeng;LI Di;LIAO Lianfang;CHEN Yunyong(Design, Research & Development Center, AECC Commerical Aircraft Engine Co., Ltd.,Shanghai 201108, China)
出处
《航空制造技术》
2017年第17期75-79,90,共6页
Aeronautical Manufacturing Technology
