含裂纹U形管的动态特性分析  

Analysis on Dynamic Characteristics of Steam Generator U-tubes with Defect

作　　者：王碧浩 房永刚[2] 兰彬[1] 苏东川[1] 

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 [2]环境保护部核与辐射安全中心,北京100082

出　　处：《机械工程师》2015年第6期35-38,共4页Mechanical Engineer

摘　　要：基于有限元程序研究了裂纹方向、尺寸和深度对蒸汽发生器U形传热管振动特性的影响,以及内压和不同裂纹与内压共同作用下U形管的动态特性。分析结果表明,非穿透裂纹对U形管振动特性的影响可以忽略,环向裂纹长度达到一定值后U形管固有频率会降低;内压使得无裂纹U形管固有频率升高,且裂纹的存在不会改变内压对U形管动态特性的影响模式。This paper investigates the dynamic characteristics of steam generator U-tubes with crack in operating nuclear power plants. To get the effects of crack on the natural frequency ,finite element computer code are performed for the U-tubes either with or without internal pressure. The results reveal that the effects of crack on the dynamic characteristics of U-tube are negligible until it becomes through-wall crack. The natural frequencies of U-tube will descends with the increase of the length of crack in the circumferential direction. In addition ,the natural frequencies of U-tube will ascend with the increase of internal pressure ,and the crack does not affect the effect of internal pressure on the dynamic characteristics of U-tubes.

关 键 词：U形管 裂纹 动态特性 

分 类 号：O347.3[理学—固体力学]