摘要
C/C复合材料在高温下具有良好的力学性能,是熔盐堆中控制棒导向管的候选材料之一。为保证熔盐堆的安全运行,研究三维针刺C/C导向管的力学性能显得十分重要。首先通过准静态侧向压缩试验,得到三维针刺C/C导向管的极限承载能力;然后基于Tsai-Wu强度张量理论,并考虑到复合材料渐进损伤时材料刚度折减,建立了导向管的三维渐进损伤模型。应用该损伤破坏模型,编写了用户材料子程序。程序计算得到的导向管载荷-位移之间的关系与试验结果基本吻合,表明三维渐进损伤模型能够有效地模拟导向管破坏过程。最后利用损伤破坏模型对不同尺寸的导向管进行模拟计算,得到了不同尺寸导向管的极限承载能力,结果发现极限载荷与导向管的直径和厚度密切相关。
[Background]C/C composite material is one of candidate materials for molten salt reactor control rod guide tubes due to its excellent mechanical properties at elevated temperature.[Purpose]This study aims to promote the application of C/C composite in molten salt reactors,and evaluate the ultimate load and damage process of 3D needle-punched C/C guide tubes.[Methods]First of all,the ultimate compressive load of a control rod guide tube was measured by a quasi-static lateral compression experiment.Then,a three-dimensional progressive damage model of the control rod guide tube was established on the base of Tsai-Wu strength tensor theory and considering the reduction of material stiffness during progressive damage of composite materials.Based on this model,a user subroutine was developed to predict its lateral compressive strength.Finally,the ultimate bearing capacity of guide pipes of different sizes was obtained by simulation,and the quasi-static lateral compression process was simulated and compared with the experimental results.[Results&Conclusions]The numerical results show that the damage model can predict the ultimate bearing capacity of control rod guide tube.Further calculations of guide tubes of different sizes show that the ultimate load is closely related to the radius and thickness of the control rod guide tube.
作者
管月霞
刘新宽
曾广礼
高彦涛
GUAN Yuexia;LIU Xinkuan;ZENG Guangli;GAO Yantao(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China)
出处
《核技术》
CAS
CSCD
北大核心
2020年第7期75-82,共8页
Nuclear Techniques
基金
中国科学院战略性先导科技专项(No.XDA02020000)
中国科学院仪器设备科学发展项目(No.YJKYYQ20170061)资助。
