An experimental analysis of fatigue behavior of a welded impeller made by FV520B stainless steel in an over-speed preloading process

作者：Zhang Yubo; Xu Binshi; Wang Haidou^*; He Pengfei; Xing Zhiguo; Fan Bonan

来源：Engineering Failure Analysis, 2016, 59: 111-121.

DOI：10.1016/j.engfailanal.2015.09.006

• Welded impeller
• HCF limit
• UHCF limit
• AE method
• IRT method
• Over-speed preloading

The purpose of this paper is to evaluate whether over-speed centrifugal force can cause fatigue damage to the welded impeller. Two non-destructive testing techniques of Acoustic Emission (AE) and Infrared Thermography (IRT) were combined to predict the fatigue limit of FV520B and its welded joint. The results indicated that the maximum stress of plastic creep shakedown stage judged by a time-displacement curve was close to the high-cycle fatigue (HCF) limit predicted by the IRT method. The AE technology might have ability to predict the ultra-high cycle fatigue (UHCF) limit. Furthermore, under the present over-speed preloading process, this impeller is located at the pure elastic stage without any fatigue damages.

• 出版日期2016-1
• 单位中国人民解放军装甲兵工程学院