摘要
三维裂纹仿真分析和防断裂设计问题一直是断裂理论和工程应用研究的主要课题。管道系统是核动力工程中的关键部件。运用三维有限元分析软件ANSYS和裂纹分析专用程序Franc3D,针对中国实验快堆(CEFR)一段余热排放系统中的含裂纹管道进行了三维裂纹仿真模拟分析和LBB(Leak-Before-Break)评定。快堆管道工作时处于高温状态,因此,采用适用于高温环境下的材料和法国结构安全设计规范RCC-MR.A16标准文件。研究的管道材料为9Cr1Mo钢的改良型——T91/P91管材,分析模型为含裂纹的三维结构,且包括管道高温工况和蠕变效应。仿真计算结果表明,针对所研究的工况,蠕变较疲劳对三维裂纹扩展的影响更大。采用T91钢的管路系统能够满足相关规范中的LBB设计准则。该研究为快堆管道选材、含缺陷管道安全评估和高温完整性评定提供设计参考。
Three- dimensional crack behavior simulation analysis and anti -crack fracture design have been a main subject in fracture theory and engineering application. Piping system is a key part of nuclear power engineering. Utilizing the three - dimensional finite element analysis software ANSYS and the spe- cialized crack analysis programs Franc3D, three -dimensional crack behavior and leak before break （LBB） case were simulated and evaluated of a pipe with a crack in waste heat exhaust system of China Experimental Fast Reactor （ CEFR ）. In fast reactor, the piping is working under a high temperature. Therefore ,the code RCC -MR. A16 was adopted that is suitable for materials and structural safety design at high temperature. Material used in this article is modified 9Crl Mo T91/P91. The analysis model of pipe section was built in three - dimensional entity structure containing a cracks and the high temperature and creep effects were considered. The simulation results show that creep contributes more effect on crack growth than fatigue.The evaluation results on LBB of studied T91 steel pipe with a crack -like defect can satisfy the need of LBB design guidelines.The research results can be referenced in pipe material choose, safety assessment and structural integrity evaluation of a pipe containing defects at high temperature in a fast reactor design.
出处
《压力容器》
2014年第11期56-60,共5页
Pressure Vessel Technology
基金
国家自然科学基金(51376163)
