Abstract

Polyvinyl chloride (PVC) foam sandwich panels have a wide application prospect in the field of warship impact protection due to the low moisture absorption, low density, excellent energy consumption and chemical resistance of PVC foam. The dynamic response of layered density-graded PVC foam sandwich panel under impact load was experimentally and numerically investigated here. A three-layer PVC foam sandwich specimen was designed and fabricated. The graded strategy of foam core was achieved by setting various foam layers with different densities. A large-diameter split-Hopkinson pressure bar device was used to perform the experimental study. The effect of density-graded strategy of foam core on the transmitted force, transmitted impulse and energy absorption were discussed. The software ANSYS/LS-DYNA was used to simulate the dynamic impact test of the foam sandwich structure. The simulation results are in good agreement with the experimental results. The results reveal that, the order of the core layer of density-graded sandwich panel has little effect on the impact resistance of the structure, while the impact resistance can be improved by increasing the density difference between foam layers. The uniform configuration UD has the largest impact force and the most specific energy absorption, while the large gradient configuration large gradient configuration has the smallest transmitted impulse under various impact velocities of the projectile. Thus, large gradient configuration has better protection effect.

摘要

聚氯乙烯（PVC）泡沫夹芯板由于PVC泡沫的低吸湿性、低密度、优异的能耗和耐化学性，在军舰冲击防护领域具有广阔的应用前景。此处通过实验和数值研究了层状密度分级 PVC 泡沫夹芯板在冲击载荷下的动态响应。设计并制作了三层 PVC 泡沫夹层试样。通过设置不同密度的各种泡沫层来实现泡沫芯的分级策略。使用大直径分离式霍普金森压力杆装置进行实验研究。讨论了泡沫芯密度分级策略对传递力、传递冲量和能量吸收的影响。采用ANSYS/LS-DYNA软件模拟泡沫夹层结构的动态冲击试验。仿真结果与实验结果吻合较好。结果表明，密度梯度夹芯板芯层排列顺序对结构抗冲击性能影响不大，增加泡沫层间密度差可提高结构抗冲击性能。均匀构型UD具有最大的冲击力和最大的比能量吸收，而大梯度构型large gradient configuration在弹体的各种冲击速度下具有最小的传递冲量。因此，大坡度配置具有更好的保护效果。结果表明，密度梯度夹芯板芯层排列顺序对结构抗冲击性能影响不大，增加泡沫层间密度差可提高结构抗冲击性能。均匀构型UD具有最大的冲击力和最大的比能量吸收，而大梯度构型large gradient configuration在弹体的各种冲击速度下具有最小的传递冲量。因此，大坡度配置具有更好的保护效果。结果表明，密度梯度夹芯板芯层排列顺序对结构抗冲击性能影响不大，增加泡沫层间密度差可提高结构抗冲击性能。均匀构型UD具有最大的冲击力和最大的比能量吸收，而大梯度构型large gradient configuration在弹体的各种冲击速度下具有最小的传递冲量。因此，大坡度配置具有更好的保护效果。均匀构型UD具有最大的冲击力和最大的比能量吸收，而大梯度构型large gradient configuration在弹体的各种冲击速度下具有最小的传递冲量。因此，大坡度配置具有更好的保护效果。均匀构型UD具有最大的冲击力和最大的比能量吸收，而大梯度构型large gradient configuration在弹体的各种冲击速度下具有最小的传递冲量。因此，大坡度配置具有更好的保护效果。