低本底实验腔的结构安全性分析  

Structural safety analysis of low background experimental cavity

作　　者：何绍祥 薛松[1] 刘书魁[2] 许明龙 邓瑞 李泽农 HE Shaoxiang;XUE Song;LIU Shukui;XU Minglong;DENG Rui;LI Zenong(School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang Sichuan 621010,China;College of Physics,Sichuan University,Chengdu Sichuan 610065,China)

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010 [2]四川大学物理学院,四川成都610065

出　　处：《中国安全科学学报》2024年第11期146-152,共7页China Safety Science Journal

摘　　要：为保障低本底实验腔的正常运行,预防腔体发生坍塌,利用Abaqus软件对实验腔开展结构安全性分析。首先,基于有限元方法建立实验腔简化模型;然后,对其进行极限工况下的静载荷响应分析、地震波载荷响应模拟分析,以及基于线性稳定性理论、弧长法的屈曲分析;最后,计算不同厚度下无氧铜段的应力响应情况和屈曲临界载荷,确定实验腔允许的极限壁厚。结果表明:在受静压时,实验腔最薄弱区域为无氧铜段顶部和圆封头过渡处,发生屈曲的临界载荷为0.307 MPa,允许的极限壁厚为5.1 mm;该低本底实验腔的结构能满足极限工况下的使用需求,验证了实验腔设计的合理性。In order to ensure the normal operation of the low-background experimental chamber and prevent structural collapse,a structural safety analysis was conducted using Abaqus software.Initially,a simplified model of the experimental chamber was established based on the finite element method.This was followed by static load response analysis under extreme conditions,seismic load response simulations,and buckling analyses.Finally,the stress response and buckling critical loads of the oxygen-free copper sections with varying thicknesses were calculated to determine the permissible limit wall thickness of the experimental chamber.The results indicated that,under static pressure,the weakest regions of the chamber were the top of the oxygen-free copper section and the transition area of the circular end cap,with a critical buckling load of 0.307 MPa and a permissible limit wall thickness of 5.1 mm.

关 键 词：低本底实验腔 结构安全性分析 屈曲分析 临界载荷 极限壁厚 

分 类 号：X944.4[环境科学与工程—安全科学]