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首页> 外文会议>2002 International Joint Power Generation Conference, Jun 24-26, 2002, Scottsdale, Arizona >CORROSION FATIGUE LIFE EVALUATION METHOD FOR THE BLADED DISK ATTACHMENTS OF LOW-PRESSURE STEAM TURBINE
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CORROSION FATIGUE LIFE EVALUATION METHOD FOR THE BLADED DISK ATTACHMENTS OF LOW-PRESSURE STEAM TURBINE

机译：低压汽轮机叶片的腐蚀疲劳寿命评估方法

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摘要

The mechanism of disk cracking was investigated and an evaluation method for its failure occurrence rate was developed. It was found that the disk cracking was caused by the corrosion pit growth, the superposition of the multiple vibration modes, and the increase in the scatter of the natural frequency due to the interface condition change after long-term operation. The effects of several uncertainties on the failure occurrence rate were examined and the values of the uncertainties were obtained by solving the inverse problem according to the failure analysis; the examined uncertainties were the standard deviation of the natural frequency and the stimulus ratio. It is recommended to perform the replica inspection by removing the blades and to take the proper maintenance actions based on the remaining life evaluations because relatively small corrosion pits can cause crack initiation. It was found that a continuous cover blade is superior to the conventional tenon-shroud-type grouped blade because the former reduces resonance points in the interference diagram and eliminates any tangential modes which are main contributors for the disk cracking.
机译：研究了磁盘破裂的机理，并提出了一种评估其破裂发生率的方法。发现盘裂纹是由腐蚀坑的增长，多种振动模式的叠加以及长期运行后由于界面条件变化引起的固有频率的散射增加所引起的。研究了几种不确定性对故障发生率的影响，并根据故障分析通过求解反问题得到了不确定性值；检验的不确定度是自然频率和激励比的标准偏差。建议通过卸下叶片来执行复制品检查，并根据剩余寿命评估采取适当的维护措施，因为相对小的腐蚀坑会引起裂纹萌生。已经发现，连续的盖片优于常规的榫-罩型成组片，因为前者减少了干涉图中的共振点，并消除了任何引起圆盘破裂的切线模式。

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