高g值冲击下圆锥壳缓冲吸能特性研究

为探究不同底角角度的圆锥壳在高g值冲击下的缓冲吸能特性,用ANSYS/LS-DYNA有限元软件在不同幅值与脉宽的半正弦加速度冲击作用下,对不同底角角度圆锥壳的缓冲效果进行数值模拟,采用屈曲模态、隔冲效率、总吸能、比吸能对缓冲效果进行评估。结果表明:圆锥壳的屈曲模态为轴对称叠缩模式;圆锥壳底角角度从90°变为65°时,隔冲效率提升25%以上、总吸能增加8%以上、比吸能增加1倍以上。圆锥壳相较圆柱壳具有更好的缓冲吸能特性;随着底角角度的减小,圆锥壳具有更好的缓冲效果。

Study on buffering energy absorption characteristics of conical tubes under impact of high g value

In order to explore the cushioning energy absorption characteristics of conical shells with different bottom angles under high g value impact,under the impact of half-sinusoidal acceleration with different amplitude and pulse width,the ANSYS/LSDYNA finite element software was applied to simulate the cushioning effect of conical shells with different bottom angles. The cushioning effect was evaluated by four indexes:The buckling mode,the isolation impact efficiency,the total energy absorption and the specific energy absorption. The results show that the buckling mode of the conical shell is an axisymmetric folding mode;When the angle of the bottom angle of the conical shell is changed from 90° to 65°,the isolation impact efficiency is increased by 25% or more,the total energy absorption is increased by 8% or more,and the specific absorption energy is more than doubled. By comparison,it is found that the conical shell has better cushioning energy absorption characteristics than the cylindrical shell;As the angle of the bottom angle decreases,the conical shell has a better cushioning effect.