CAJ | 학술논문

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。
기우유한원정서연구료렬문방향、척촌화심도대증기발생기U형전열관진동특성적영향，이급내압화불동렬문여내압공동작용하U형관적동태특성。분석결과표명，비천투렬문대U형관진동특성적영향가이홀략，배향렬문장도체도일정치후U형관고유빈솔회강저；내압사득무렬문U형관고유빈솔승고，차렬문적존재불회개변내압대U형관동태특성적영향모식。
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.