防船撞蜂窝式复合材料夹层板的耐撞性研究

摘要

钢蒙皮-折叠金属薄片夹芯或复合材料夹芯式夹层板在桥梁防船撞领域被广泛使用.基于数值仿真方法,考虑冲头穿透与未穿透的2种情况下,对钢蒙皮-蜂窝金属薄片夹芯、蜂窝玻璃纤维增强塑料夹芯这2类夹层板在低速冲击载荷下的动态响应、吸能效果和损伤特征进行对比分析.计算结果表明,玻璃纤维增强塑料夹芯式夹层板抗撞击力最大,撞深大于金属薄片夹芯式夹层板;玻璃纤维增强塑料夹芯提高了整体结构的刚度,不利于通过整体结构弹性变形吸收更多的能量;在冲头穿透夹层板过程中,玻璃纤维增强塑料夹芯出现大面积的破裂,吸能效果明显低于金属薄片夹芯.%The metal faced-foil core/composite core sandwich panels are widely employed in the field of bridge anti-ship collision.In this paper, the scenarios in which the punch penetrates or not penetrates the sandwich panels are both considered based on numerical simulations.The dynamic response, energy absorption and damage characteristics of the sandwich panels under the low-velocity impact are analyzed and compared using numerical simulation method.The results show that the maximum impacted depth of the sandwich plate with glass fiber reinforced plastic core is larger than that of the sandwich panel with foil core.In addition, the sandwich plate with glass fiber reinforced plastic core improves the rigidity of the whole structure, which is not conducive to absorb more energy through the elastic deformation of the whole structure.Furthermore, the glass fiber reinforced plastic sandwich shows extensive rupture when the punch penetrating the sandwich plates, and thus its energy absorption is significantly lower than that of the sheet metal core sandwich panels.