Structural safety analysis of low background experimental cavity

doi:10.16265/j.cnki.issn1003-3033.2024.11.0188

Abstract

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

CLC Number:

X944.4

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