汽轮机部件多轴蠕变-疲劳寿命评估方法  

Multi-Axial Creep and Fatigue Life Assessment Method for Steam Turbine Components

作　　者：陈钢 冯淼林[2] CHEN Gang;FENG Miaoin(Shanghai Electric Power Generation Co.,Ltd.Shanghai Turbine Plant,Shanghai 200240,China;School of Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海电气电站设备有限公司汽轮机厂,上海200240 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《热力透平》2024年第2期71-75,101,共6页Thermal Turbine

摘　　要：汽轮机汽缸、转子等高温部件运行中受到疲劳损伤和蠕变损伤,二者的损伤机制会互相影响,有必要对疲劳损伤和蠕变损伤以及二者的耦合作用进行评估。在Ohno-Wang循环塑性模型基础上进行了拓展,提出了一种统一黏弹塑性循环材料本构模型,在ABAQUS平台上采用UMAT用户子程序开发了多轴蠕变-疲劳耦合分析程序。采用该程序对1 000 MW超超临界机组高温转子进行了多轴蠕变-疲劳寿命评估,结果显示损伤最大的位置出现在第1级动叶叶根轮槽位置。研究成果可为汽轮机高温部件的寿命评估提供技术支撑。High-temperature components of steam turbine,such as casing and rotor,are subject to fatigue damage and creep damage during operation.There is interaction between the damage mechanisms,and it is necessary to evaluate the coupling of the two.A unified visco-elastic-plastic cycle material constitutive model was proposed based on Ohno-Wang cycle plastic model.A multiaxial creep-fatigue coupling analysis program was developed using UMAT in ABAQUS.The program was used to evaluate the multiaxial creep-fatigue life of high-temperature rotor in a 1000 MW ultra-supercritical unit,and the results showed that the most damaged part located at the root groove of the first stage rotating blade.The research results can provide technical assurance for life assessment of high-temperature components in steam turbines.

关 键 词：超超临界汽轮机 多轴蠕变 疲劳损伤 黏弹塑性循环本构模型 用户子程序 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]