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汽轮机汽缸蠕变-疲劳耦合寿命预测
投稿时间:2017-08-25  修订日期:2017-09-24  点此下载全文
引用本文:唐敏锦,叶兴柱.汽轮机汽缸蠕变-疲劳耦合寿命预测[J].计算机辅助工程,2018,27(1):55-60.
作者单位E-mail
唐敏锦 上海电气电站设备有限公司 上海汽轮机厂 tmj012003@163.com 
叶兴柱 上海电气电站设备有限公司 上海汽轮机厂 646763737@qq.com 
中文摘要:为探索汽轮机汽缸裂纹产生的原因、带裂纹汽缸的剩余寿命、汽缸延寿等问题,开展蠕变和疲劳交互作用下的汽缸寿命预测。利用有限元计算汽缸在稳态和启停工况下的应力情况。基于蠕变 疲劳耦合理论进行裂纹萌生和扩展的寿命预测,从运行方式和汽缸结构2方面开展优化。研究结果表明:该中压内缸中分面法兰的拐角处存在较大的热应力集中,其寿命损伤大导致裂纹萌生。经过结构修复,机组寿命显著延长。
中文关键词:汽轮机  中压内缸  低周疲劳  蠕变  启停机
 
Creep-fatigue coupling life prediction of steam turbine cylinder
Abstract:To study the reason of steam turbine cylinder crack initiation, the remaining life of cracked cylinder, the life extension of cylinder, and the life prediction of cylinder under the interaction of creep and fatigue is carried out. The stress fields of the cylinder in the steady condition and the startup and shutdown condition are calculated using finite element method. The fatigue life of crack initiation and growth are predicted based on the creep-fatigue coupling theory. The optimization on the operation mode and cylinder structure is studied. The analysis results show that there is an evident thermal stress concentration at the corner of flange in the intermediate pressure inner cylinder, which leads to the crack initiation. After the structure repairing, the fatigue life of assembling unit is prolonged significantly.
keywords:steam turbine  intermediate pressure inner cylinder  low cycle fatigue  creep  startup and shutdown
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