瞬态载荷下堆芯筒体内表面半圆形轴向裂纹疲劳扩展模拟研究  

Simulation Study on Fatigue Growth of Semi-Circular Axial Crack on Inner Surface of Core Barrel under Transient Loads

作　　者：石凯凯[1] 郑斌[1] 郑连纲[1] Shi Kaikai;Zheng Bin;Zheng Liangang(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,成都610213

出　　处：《核动力工程》2021年第S02期1-4,共4页Nuclear Power Engineering

摘　　要：为研究瞬态载荷下堆芯筒体内表面裂纹疲劳扩展,采用Zencrack软件中的裂纹块分析方法,对反应堆压力容器堆芯筒体内表面含半圆形轴向裂纹(裂纹深度d为10 mm,裂纹表面长度l为20 mm)在瞬态载荷下的裂纹形貌变化规律进行了仿真模拟研究,其中采用子程序对堆芯筒体材料的疲劳裂纹扩展速率模型进行了实现。通过仿真研究可知:材料疲劳裂纹扩展速率模型的子程序实现是分析裂纹疲劳扩展模拟的一种高效方式;裂纹块分析方法计算得到的应力强度因子与规范工程化分析方法计算得到的结果是相当的;堆芯筒体内表面初始态为半圆形的轴向裂纹,在瞬态载荷下其裂纹疲劳扩展会出现初始态裂纹椭圆化的过程。In order to study the fatigue growth of inner surface cracks in the core barrel under transient loads,the change law of crack morphology of semi-circular axial crack(crack depth d is 10 mm and crack surface length L is 20 mm)on the inner surface of reactor pressure vessel core barrel under transient load is simulated by using the crack block analysis method in the Zencrack software,wherein,the fatigue crack growth rate model of core cylinder material is realized by subprogram.Through the simulation study,it is known that the subprogram realization of material fatigue crack growth rate model is an efficient way to analyze the simulation of crack fatigue growth;the stress intensity factor calculated by the crack block analysis method is similar to that calculated by the standard engineering analysis method;.For the axial cracks with a semi-circular initial state on the inner surface of the core barrel,the initial crack ovalization will occur during the fatigue growth of the crack under transient loads.

关 键 词：裂纹疲劳扩展 堆芯筒体 半圆形轴向裂纹 瞬态载荷 

分 类 号：TL353.9[核科学技术—核技术及应用]