低本底实验腔的结构安全性分析

doi:10.16265/j.cnki.issn1003-3033.2024.11.0188

摘要/Abstract

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。

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

Abstract:

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.

Key words: low background experimental cavity, structural safety analysis, earthquake response simulation, buckling analysis, limit wall thickness

中图分类号:

X944.4

何绍祥, 薛松, 刘书魁, 许明龙, 邓瑞, 李泽农. 低本底实验腔的结构安全性分析[J]. 中国安全科学学报, 2024, 34(11): 146-152.

HE Shaoxiang, XUE Song, LIU Shukui, XU Minglong, DENG Rui, LI Zenong. Structural safety analysis of low background experimental cavity[J]. China Safety Science Journal, 2024, 34(11): 146-152.

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材料性能	无氧铜	SUS304
密度/(g·cm^-3)	8.94	7.93
抗拉强度/MPa	196	520
屈服强度/MPa	81	205
弹性模量/GPa	115	194.02
泊松比	0.34	0.3

分析情况	分析对象	网格	分析方法
外压模拟	无氧铜段	Shell	静力学
地震模拟	整体	Solid	隐式动力学
屈曲分析	无氧铜段	Shell	线性/非线性分析

案例	1^[12]	2^[13]	3^[14]
计算平台	Abaqus	Abaqus	Ansys
模型	圆筒壳体	圆筒壳体	圆筒壳体
计算方法	弧长法	弧长法	弧长法
案例	1^[12]	2^[13]	3^[14]
临界载荷计算值/MPa	135.08	48.7	31.35
临界载荷试验值/MPa	139.39	53.4	28.7
误差/%	3.1	8.8	8.44
平均误差/%	6.78

分析情况	最大等效应力/ 最大压力	许用应力/ 许用压力	是否合格
静压力模拟	16.35	54	是
地震模拟P₁	77.29	136	是
地震模拟P₂	75.20	136	是
无氧铜段	0.2	0.307	是