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作 者:张瀛[1] 邝临源 姜露 杜娟[1] 刘贞谷 ZHANG Ying;KUANG Linyuan;JIANG Lu;DU Juan;LIU Zhenyu(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)
机构地区:[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610213
出 处:《原子能科学技术》2022年第7期1356-1363,共8页Atomic Energy Science and Technology
摘 要:由于翅片管处于高温环境和外压载荷下,需要考虑其发生蠕变屈曲失效的风险。本文对翅片管在高温环境下的蠕变屈曲分析及评定方法进行了研究,提出了一种基于塑性本构和蠕变本构的有限元长时蠕变屈曲分析方法,并通过数值拟合,获得了高温屈曲的失效评定图以及失效评定公式,提出了一种方便应用于工程的快速评定方法。针对翅片管结构,将该方法的评定结果与规范中的屈曲分析评定结果进行对比,验证了该方法的可行性。同时研究了在有压力波动的情况下,结构的临界屈曲时间与载荷历程的关系,为复杂结构和复杂载荷工况的蠕变屈曲分析奠定了基础。To improve economy,compared to the third generation nuclear reactor,the fourth generation nuclear reactor has higher design and operating temperature.Heat exchange tube is an important component of reactor heat exchanger,and finned tube is a kind of heat exchange tube which increases the heat transfer area by adding fins,so as to improve the heat exchange efficiency.The finned tube needs to consider the risk of creep buckling failure because which is at high temperature and under external pressure.This paper focus on the creep buckling analysis and assessment method of finned tube at high temperature.Firstly,the creep buckling analysis and assessment method of the code was used to calculate the criticalbuckling pressures at different durations.However,this method is only applicable to stainless steel materials whose high temperature duration does not exceed 10000 hours and the temperature is lower than 700℃.Secondly,the finite element method was adopted.ANSYS was used to solve the critical creep buckling time of external pressure cylindrical shell with constant pressure and constant temperature,and a comparative analysis was made based on the analysis results of code method.It provides method preparation for creep buckling analysis of complex structures and load conditions.The eigenvalue buckling analysis was used to get the shape with initial defect.After the initial defect of the structure was obtained by eigenvalue buckling analysis,the initial defect was corrected by multiplying a proportional coefficient to match the maximum tolerance,and then it was introduced into the structure.At the same time,the plastic constitutive and creep constitutive of the material were considered for nonlinear buckling analysis.Then the critical buckling time under different conditions was calculated by numerical fitting,the failure assessment diagram was obtained.Finally,since the external pressure on the finned tube is not always constant,the pressure will change with time.In engineering,the constant maximum pressure for cree
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