孔管型支承结构的弹性跟随行为及优化研究  

Study on elastic follow-up behavior and optimization of hole tube type supporting structure

作　　者：李智 曾晓佳 莫亚飞[1] 高付海[1] 赵守智[1] LI Zhi;ZENG Xiaojia;MO Yafei;GAO Fuhai;ZHAO Shouzhi(China Institute of Atomic Energy,Department of Nuclear Engineering Design,,Beijing102413,China;State Administration of Science,Technology and Industry for National Defense,Nuclear Technology Support Center,Beijing100070,China)

机构地区：[1]中国原子能科学研究院核工程设计研究所,北京102413 [2]国防科工局核技术支持中心,北京100070

出　　处：《压力容器》2022年第11期39-46,共8页Pressure Vessel Technology

摘　　要：孔管型支承结构常见于快堆设备中,如中间热交换器支承和独立热交换器支承,其由于结构局部刚度不连续的特征而存在弹性跟随效应。通过对瞬态冷冲击工况下孔管型支承结构进行热弹塑性分析,验证了该结构存在显著的弹性跟随特征,并提出了通过减少结构强刚性段壁厚的方法减弱弹性跟随效应引起的弹性应力增加和应变集中的不利现象。结果表明:优化后结构弹性分析应力降幅高达62%,塑性分析等效塑性应变降幅高达47.2%。因此在进行核电厂工程结构设计时,基于实际载荷工况组合,需尽量缩小结构局部刚度不连续区的刚度差距,从而规避弹性跟随效应,降低结构内部应力应变,延长结构使用寿命。Hole tube type supporting structure is commonly used in fast reactor equipment, such as intermediate heat exchanger supports and independent heat exchanger supports, which have elastic follow-up effects due to the discontinuous local stiffness characteristics of the structure.In this study, through the analysis of the thermal elastic-plastic results of the hole tube support structure under the transient cold shock condition, it is verified that the structure has significant elastic follow-up characteristics, and the method of reducing the wall thickness of the strong rigid section of the structure was proposed to reduce the unfavorable phenomenon of elastic stress increase and strain concentration caused by the elastic follow-up effect.The results show that after optimization, the stress reduction in elastic analysis of the structure is as high as 62%,and the equivalent plastic strain reduction in plastic analysis is as high as 47.2%.Therefore, in the structural design of nuclear power plant engineering, based on the combination of actual load conditions, it is necessary to minimize the stiffness gap in the local stiffness discontinuity area of the structure, so as to avoid the elastic follow-up effect, reduce the internal stress and strain of the structure, and prolong the service life of the structure.

关 键 词：快堆 孔管型支承结构 热弹塑性 弹性跟随 应变集中 

分 类 号：TH49[机械工程—机械制造及自动化] TL351[核科学技术—核技术及应用] O344.3[理学—固体力学]