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首页> 外文会议>NDE-vol.26; ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >MMM STRESS EVALUATION AND FRACTURE ANALYSIS FOR STEAM TURBINE FAILURE BLADE
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MMM STRESS EVALUATION AND FRACTURE ANALYSIS FOR STEAM TURBINE FAILURE BLADE

机译：汽轮机故障叶片MMM应力评估与断裂分析

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摘要

Metal magnetic memory (MMM) technology, a new NDE method, has been applied to stress evaluation and fracture analysis for the 50MW turbine failure blade. The static and dynamic stress of failure blade is calculated and analyzed. The rupture blade of steam turbine is detected at workshop. Given are the MMM signal characteristics of stress distribution for the failure blade and fracture face. It has been found: for the blade profile, the MMM air-out side curve occurs more zero passage signals than air-in side one; for the fracture surface, the crack transition zone's MMM variation amplitude is minimal, the crack initiation zone's is in the middle, and the tear fracture zone's is maximal. The result from small hole stress measuring method is consistent with MMM result. This shows MMM technology is a new tool of fracture analysis and stress testing in engineering practice.
机译：金属磁记忆（MMM）技术是一种新的NDE方法，已用于50MW涡轮机故障叶片的应力评估和断裂分析。计算并分析了故障叶片的静应力和动应力。汽轮机的破裂叶片在车间被检测到。给出了失效刀片和断裂面应力分布的MMM信号特征。已经发现：对于叶片轮廓，MMM空气出口侧曲线比空气入口侧1出现更多的零通道信号；对于断裂面，裂纹过渡区的MMM变化幅度最小，裂纹起始区在中间，而撕裂断裂区最大。小孔应力测量方法的结果与MMM结果一致。这表明MMM技术是工程实践中断裂分析和应力测试的新工具。

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