摘要
介绍了汽轮机零部件多轴应力状态下的强度设计方法和低周疲劳裂纹萌生寿命预测方法,分析了汽轮机零部件多轴应力状态下稳态额定工况的极限载荷与分析设计判据,以及瞬态变工况强度的安定载荷与分析设计判据,提出了汽轮机零部件多轴应力状态下寿命预测使用的等效应力和等效应变正负号的确定方法,给出了汽轮机零部件多轴应力状态下的等效应力与等效应变的换算公式以及强度和寿命设计的安全系数。应用这些设计判据和安全系数,进行汽轮机零部件的强度设计和寿命预测,为汽轮机零部件的长周期安全运行提供了依据。
The strength design method and life prediction method for low cycle fatigue crack initiation of steam turbine components under multiaxial stress states are introduced. The collapse load and the analysis design criteria for components in rated condition under multiaxial stress states, as well as the instantaneous variable condition loads and the analysis design criteria are analyzed. An approach to decide the sign of the equivalent stress and equivalent strain is proposed for life prediction of steam turbine components under multiaxial stress states. The conversion formulas are given together with safety factors of strength design and life prediction. The design and life prediction of components based on these design criteria and safety factors provides a scientific basis for the long period of safe operation of the turbine components.
出处
《热力透平》
2012年第2期131-139,146,共10页
Thermal Turbine
基金
上海市科委基础研究重点项目资助课题(11JC1404500)
上海市经济和信息化委员会资助项目(201101009)
关键词
汽轮机
零部件
有限元分析
多轴应力状态
强度设计
寿命预测
steam turbine
components
finite element analysis
multiaxial stress state
strength design
life prediction
