Research on Strength Characteristics of Seabed Observer Pressure Hull
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摘要: 以1 000 m水深某海底观测仪耐压壳体为研究对象,运用有限单元法,对比分析经典公式计算结果,分析经验公式的局限性;通过线性屈曲和非线性后屈曲分析得到不同长径比模型临界载荷的变化规律和极限强度以及后屈曲行为的变化特点;通过多工况的有限元计算分析,推导加筋圆柱壳的临界失稳载荷公式,最终得到重量减轻14.8%加筋圆柱壳结构。Abstract: Taking the pressure hull of a seabed observer at 1 000 m depth as the study object, this paper compared and analyzed the calculation results of classical formulas and the limitations of empirical formulas based on the finite element method. Through linear buckling and non-linear post-buckling analysis, the rule of critical bearing load, ultimate strength and post-buckling behavior characteristics of models with different aspect ratios can be obtained. Moreover, the critical instability load formula of stiffened cylindrical shells can be deduced through the finite element calculation and analysis under multiple working conditions, thus obtaining the stiffened cylindrical shell structure with 14.8% of weight reduction.
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Key words:
- linear buckling /
- non-linear post-buckling /
- critical load /
- stiffened cylindrical shell /
- aspect ratio
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表 1 钛合金物理参数
参数 数值 参数 数值 弹性模量E/MPa 1.127×105 屈服强度σs/MPa 872 泊松比υ 0.3 抗拉强度σb/MPa 941 表 2 临界失稳载荷计算值
D/mm L/mm L/D P0/MPa PC/MPa P0/PC 500 750 1.5 5.99 10 60% 表 3 各长径比模型后屈曲行为
L/D 0.5 1 1.5 2 2.5 3 3.5 4 变形云图 1.00 2.41 2.03 1.43 0.60 11.56 10.56 10.01 表 4 h=4时各工况下n与s关系
工况 筋的数量n s 1 1 4 6 8 10 12 2 2 4 6 8 10 12 3 3 4 6 8 10 12 表 5 s=4时各工况下n与h关系
工况 筋的数量n h 4 1 4 6 8 10 12 5 2 4 6 8 10 12 6 3 4 6 8 10 12 表 6 h=4各工况计算结果
s P0/P10 M/M10 n=1 n=2 n=3 n=1 n=2 n=3 4 0.60 0.60 0.60 0.82 0.82 0.83 6 0.60 0.61 0.61 0.82 0.83 0.83 8 0.60 0.62 0.63 0.82 0.83 0.83 10 0.61 0.62 0.64 0.82 0.83 0.83 12 0.61 0.63 0.65 0.83 0.83 0.83 表 7 s=4各工况计算结果
h P0/P10 M/M10 n=1 n=2 n=3 n=1 n=2 n=3 4 0.60 0.60 0.60 0.82 0.82 0.83 6 0.60 0.62 0.63 0.82 0.83 0.83 8 0.62 0.64 0.67 0.82 0.83 0.83 10 0.64 0.68 0.72 0.82 0.83 0.83 12 0.67 0.73 0.78 0.83 0.83 0.83 表 8 加筋圆柱壳计算结果
P0/MPa Qs/MPa M/kg M10/kg (M10-M)/M10/% 10.16 287 37.48 44 14.8 -
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