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首页> 外文会议>International Symposium on Risk, Economy and Safety, Failure Minimisation and Analysis(Failures 2006); 20060313-17; Gordon's Bay(ZA) >INVESTIGATION AND ANALYSIS OF BLADE FAILURES OF A LOW PRESSURE STEAM TURBINE
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INVESTIGATION AND ANALYSIS OF BLADE FAILURES OF A LOW PRESSURE STEAM TURBINE

机译：低压汽轮机叶片故障的调查与分析

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Steam turbines, in both nuclear and fossil power plants are the main important auxiliary equipment. Over the years, power plants have experienced various events of turbine failures e.g. failure of shafts, blade roots. These failures have been disastrous and with little warning. Such failures have lead to unscheduled outages and long plant down time. Uncovering of fracture in multiple fork blade roots, during routine turbine inspections is a cause for concern. The objectives were to present an analysis of stress characteristics of a multiple fork blade roots under static condition The approach was to model the blade roots; perform a static FEA; analyse the stress behaviour when self induced cracks are introduced and when both the outer fingers have been broken. Analysis concluded that failure of inner fingers would always be preceded by failure of adjacent outer fingers. Stress concentration experienced by the lower locking pinholes is minimal compared with upper locking pinholes.
机译：核电厂和化石电厂中的蒸汽轮机都是主要的重要辅助设备。多年来，发电厂经历了各种涡轮机故障事件，例如轴，叶片根部故障。这些失败是灾难性的，几乎没有警告。此类故障导致计划外停机和较长的设备停机时间。在常规的涡轮机检查过程中，发现多个叉叶片根部的断裂是令人担忧的。目的是对多叉叶片根部在静态条件下的应力特性进行分析。执行静态FEA；当引入自生裂纹以及两个外指均断裂时，分析应力行为。分析得出的结论是，内指的失效总是先于相邻外指的失效。与上锁孔相比，下锁孔的应力集中最小。

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