碳纤维复合材料缠绕修复的压力管道断裂分析  

Fracture Analysis for Pressure Pipe Wrapped with Carbon-Fiber Reinforced Composites

作　　者：柳军[1] 严波[1] 卢岳川[2] 孙英学[2] 姜乃斌[2] 常学平[3] 

机构地区：[1]重庆大学工程力学系,重庆400044 [2]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610041 [3]西南石油大学工程力学系,成都610500

出　　处：《核动力工程》2011年第2期48-52,115,共6页Nuclear Power Engineering

基　　金：核反应堆系统设计技术国家级重点实验室基金资助(ZDS-A-0908);四川省青年基金资助(09ZB101)

摘　　要：采用耦合的有限元-无网格Galerkin数值算法,计算了碳纤维增强型复合材料缠绕修复的压力管道横向贯穿裂纹以及横向椭圆型表面裂纹前沿应力强度因子,据此分析了碳纤维增强型复合材料套袖长度对压力管道裂纹应力强度因子的影响。结果表明,本文所提算法能有效计算三维问题应力强度因子;含裂纹压力管道采用碳纤维增强型复合材料缠绕修复后,裂纹前沿的应力强度因子显著降低;修复套袖越长,修复效果越显著,但套袖长度超过一定范围后,应力强度因子的降低趋于缓慢,对修复效能的进一步提高贡献甚微。A coupled FEM/EFG numerical method is introduced to calculate the stress intensity factors（SIF） along the crack front of a cracked pressure pipe line wrapped with carbon-fiber reinforced composite material（CFRC）.Two types of crack shape,traverse through-wall crack and surface ellipse crack are consid-ered respectively,based on which the effect of the CFRC sleeve length to the Stress Intensity Factors is numeri-cally investigated.It shows that using the algorithm presented in this paper,the stress intensity factrs of 3D component can be calculated effectively,and the SIF of the cracked pressure pipe line repaired with CFRC decrease obviously,compared to the original cracked pipe without any repair.Better repair efficiency is ob-tained with the increase of the sleeve length,but when the length is increased to a certain value,the length increasing of the sleeve contributes little to the decrease of the SIF,therefore to the repair efficiency.

关 键 词：有限元-无网格耦合算法 裂纹压力管道 碳纤维复合材料 缠绕修复 应力强度因子 

分 类 号：O346.1[理学—固体力学]