双曲扁壳防冲吸能构件吸能特性仿真分析

    Simulation analysis of energy absorption characteristics of hyperbolic shallow shell anti-impact energy absorbing components

    • 摘要: 为了提高液压支架防治矿井冲击地压的性能,设计了一种双曲扁壳防冲吸能构件。采用有限元数值模拟的方法对新型防冲吸能构件进行了性能分析,包括构件不同底面弧弦高、侧面弧偏心距、侧面弧弦高、堆叠层数等参数以及不同壁厚与不同材料的防冲吸能特性分析。有限元分析结果表明:随底面弦高LC增大,构件承载力会提升,且平均承载力向初始峰值承载力逼近,当底面弦高从10 mm增加到20 mm,构件的初始峰值承载力提高了28%,平均承载力提升了61%;偏心距LP增大使初始峰值承载力降低,平均承载力和总吸能会在偏心距LP=5 mm时出现峰值,平均承载力达到3 126 kN,总吸能达到312.6 kJ;随着侧面弦高LD的增大,初始峰值承载力和平均承载力降低,且降低速度加快,当侧面弦高从2 mm增加到4 mm时,构件初始峰值承载力降低了11.9%,平均承载力降低了12.5%;随着堆叠层数的增多,承载力变化趋稳,但波动范围扩大,初始峰值承载力Fmax差异不显著;壁厚越厚,构件的承载力越大,且承载力波动系数无明显变化;不同材料对构件的稳定性影响不大。当双曲扁壳防冲吸能构件底面弦高为20 mm、侧弦高为2.5 mm、偏心距为5 mm、堆叠层数为3层、材料厚度为8 mm时,双曲扁壳防冲吸能构件的初始峰值承载力达到了3 390 kN,平均承载力达到了3 341 kN,承载力波动系数为1.01,100 mm塑性变形总吸能为334.1 kJ,单位质量吸收能量为35.4 kJ/kg,最符合吸能支架要求,且通过尺寸、材料、厚度调整可应用于多种液压立柱。

       

      Abstract: To enhance the impact resistance and energy absorption performance of hydraulic supports in mitigating coal mine rock burst, a hyperbolic shallow shell anti-impact energy-absorbing component was designed. Finite element numerical simulations were conducted to analyze the performance of a navel anti-impact energy-absorbing component under various parameters, including base arc chord height, lateral arc eccentricity, lateral arc chord height, stacking layers, as well as wall thickness and different materials. The finite element analysis results show that: increasing the base arc chord height (Lc) improved the load-bearing capacity of the component, with the average load-bearing force approaching the initial peak value, specifically, when the base arc chord height increased from 10 mm to 20 mm, the initial peak load-bearing capacity rose by 28%, and the average load-bearing capacity increased by 61; a larger lateral arc eccentricity (Lp) reduced the initial peak load-bearing capacity, while the average load-bearing capacity and total energy absorption peaked at an eccentricity of 5 mm, achieving values of 3 126 kN and 312.6 kJ, respectively; increasing the lateral arc chord height (Ld) decreased both the initial peak and average load-bearing capacities, with a notable acceleration in reduction observed when the lateral arc chord height increased from 2 mm to 4 mm, resulting in an 11.9% decrease in initial peak capacity and a 12.5% reduction in average capacity; stacking additional layers stabilized the load-bearing capacity but widened its fluctuation range, with minimal variation in peak impact force Fmax; thicker walls enhanced load-bearing capacity without significantly affecting the fluctuation coefficient; material selection had a negligible impact on structural stability. When the chord height distance of the bottom surface of the hyperbolic shallow shell anti-impact energy absorption component is 20 mm, the side chord height distance is 2.5 mm, the eccentricity is 5 mm, the stacking layer number is 3, and the thickness is 8 mm, the initial peak bearing capacity of the hyperbolic shallow shell anti-impact energy absorption component reaches 3 390 kN, the average bearing capacity reaches 3 341 kN, the load fluctuation coefficient is 1.01, the total plastic deformation energy absorption of 100 mm is 334.1 kJ, the energy absorption per unit mass is 35.4 kJ/kg, which best meets the requirements of the energy absorption support, and it can be applied to various hydraulic supports by adjusting the size, material and thickness.

       

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