泡沫填充负泊松比蜂窝夹层结构的抗爆性能数值模拟

Numerical Simulation of Blast Resistance of Foam-filled Auxetic Honeycomb Sandwich Structures

为研究爆炸荷载作用下泡沫填充负泊松比蜂窝夹层结构(Foam-filled Auxetic Honeycomb Sandwich Structure,FAHSS)的动态响应及其对混凝土板的防护性能,利用有限元软件,考虑应变率对材料动态本构特性的影响,建立FAHSS在爆炸荷载下的有限元数值模型。通过已有负泊松比蜂窝夹层结构(Auxetic Honeycomb Sandwich Structure,AHSS)的爆炸试验对数值模型进行验证,基于验证模型分析爆炸荷载作用下FAHSS的损伤破坏规律、能量吸收特性及其对混凝土板的应力分布影响,并与AHSS和FSS(Foam Sandwich Structure)进行对比。在此基础上综合考虑聚氨酯泡沫材料密度、爆炸比例距离及填充材料等因素对FAHSS抗爆性能的影响。研究结果表明:FAHSS中的泡沫填充降低了负泊松比蜂窝夹层结构的破坏程度;随着聚氨酯泡沫材料密度的增加,FAHSS中的泡沫材料吸收能量增加;随着比例距离的增加,FAHSS的破坏程度逐渐降低,破坏形态也由局部破坏转变为整体破坏。

The dynamic response of foam-filled auxetic honeycomb sandwich structure(FAHSS)under blast load and its protective performance against concrete slabs are studied.A finite element numerical model of FAHSS under blast load,which considers the effect of strain rate on the dynamic intrinsic properties of the material,is established by utilizing finite element software ANSYS/LS-DYNA.The numerical model is validated by the existing auxetic honeycomb sandwich structure(AHSS)explosion test.The damage and failure law and energy absorption characteristics of FAHSS and its influence on the stress distribution of concrete slab are analyzed based on the validated model.FAHSS is compared with AHSS and foam sandwich structure(FSS).On this basis,the effects of polyurethane foam material density,explosion proportional distance and filling material on the blast resistance performance of FAHSS are considered.The results show that the foam filling in FAHSS reduces the damage degree of auxetic honeycomb sandwich structure.With the increase in the density of polyurethane foam material,the energy absorption of foam material in FAHSS increases.With the increase in scaled distances,the damage degree of FAHSS gradually decreases,and the damage mode changes from local damage to overall damage.