蒸汽发生器作为压水堆的重要压力边界,其传热管是否破损直接关系到反应堆的运行安全.为解决蒸汽发生器中传热管疲劳裂纹扩展数字孪生中裂纹长度的预测问题,本文通过ABAQUS软件,对已存在贯穿裂纹的传热管进行建模,比较其自带的围线积分法和扩展有限元法(extended finite element method,XFEM)计算应力强度因子(stress intensity factor,SIF)的准确性.在裂纹尺寸a/W＞0.5 时,XFEM与公式解结果相差较小.因此,采用XFEM计算其在不同应力下的应力强度因子,发现随着裂纹尺寸、载荷的增大,应力强度因子也随着增大,应力值与应力强度因子成正比关系.
Calculation of stress intensity factor of heat transfer tube with through-wall crack based on extended finite element method
As an important pressure boundary of pressurized water reactors,steam generators directly affect the operational safety of the reactor by judging whether the heat transfer tubes are damaged or not.In order to solve the problem of crack length prediction in the digital twin of fatigue crack propagation of heat transfer tube in steam generator,this paper uses the software ABAQUS to model heat transfer tubes with existing through cracks,compares the accuracy of their built-in contour integration method and extended finite element method(XFEM)calculation of stress intensity factors(SIF).When the crack size is larger than 0.5,i.e.a/W>0.5,the difference between XFEM and the formula is small.Therefore,XFEM was used to calculate the stress intensity factor under different stresses.It was found that with the increase of crack size and load,the stress intensity factor also increased,and the stress value was proportional to the stress intensity factor.
steam generatorheat transfer tubethrough crackperimeter integral methodextended finite element methodABAQUSstress intensity factorcrack propagation
万方数据
维普
