梯度铝泡沫夹层结构抗爆性能仿真与优化

采用动力显式有限元方法,以面比吸能和背板最大变形量为评价指标,研究了铝合金面板—梯度铝泡沫芯体—装甲钢背板夹层结构的抗爆性能。分析了芯体密度梯度排布对结构抗爆性能的影响,并与均匀密度铝泡沫夹层板进行了对比。同时,基于径向基函数建立了夹层结构抗爆性能预测响应面模型,在此基础上对夹层结构进行了多目标优化设计。结果表明,铝泡沫芯体相对密度排布顺序对夹层结构抗爆性影响明显;具有最佳芯体密度梯度排布的铝泡沫夹层结构的抗爆性能明显优于等质量的均匀密度铝泡沫夹层结构;多目标优化可进一步提高梯度铝泡沫夹层结构的综合抗爆性能。

Simulation and optimization of blast-resistant performance of graded aluminum foam sandwich structures

Blast-resistant performance of the sandwich structures consisting of aluminum alloy front panel, graded aluminum foam core, and armor steel back panel were investigated using the dynamic explicit finite element method. Areal specific energy absorption (ASEA) and maximum back panel deformation (MaxD) were adopted as performance indexes. The effects of relative density arrangement of the graded aluminum foam core on the blast-resistant of the sandwich structures were analyzed. The performance of uniform-density aluminum foam sandwich panel (UAFSP) was also examined for comparison purpose. Meanwhile, response surface models (RSM) for blast-resistant performance prediction were established based on radial basis functions (RBF). Multiobjective design optimization (MDO) was performed for the sandwich structures based on the RSM. The results show that density rank of the aluminum foam core has great influence on the blast-resistant of the sandwich structure, and the graded aluminum foam sandwich panel is superior to the UAF panel. MDO of the graded aluminum foam sandwich structure can further improve its blast-resistant performance.