聚脲弹性体涂覆结构抗侵性能与层间作用机制研究

Penetration Resistance and Layers Mutual Effect of Polyurea Coated Structures

研究了聚脲弹性体涂覆钢板、涂覆纤维复合材料板抗破片侵彻性能以及涂层与底材层间作用机制.通过弹道试验加载3.3 g立方体破片撞击聚脲涂覆钢板、FRC板结构,获得无涂覆、迎弹面涂覆和背弹面涂覆3种涂覆类型结构的弹道极限,得到了不同涂覆方式下结构抗侵彻性能差异以及变形与失效特征.结果表明,聚脲弹性体涂层对涂覆结构抗破片侵彻性能的影响作用与涂覆底材自身的吸能机制相关;钢板吸能形式为局部变形与剪切冲塞,涂层对钢板耗能作用影响小,且能够有效提高结构抗侵性能,迎弹面涂覆效果优于背弹面;FRC板吸能形式主要为背部纤维的拉伸断裂与层间分离,背弹面涂层抑制纤维板吸能作用,大幅降低涂覆结构抗侵效率.

Polyurea elastomer coated steel plates and coated fiber reinforced composite laminates were investigated on their penetration resistance and layers’ mutual effect. Ballistic experiment of two polyurea coated substrates subjected to 3.3 g cubic fragments was conducted. Ballistic limits of three coating types of structures-uncoated, impact side coated and rear side coated-were obtained. Penetration resistance of different polyurea coated structures was analyzed with the deformation and failure characteristic. Experimental results indicate that the effect of polyurea coating on penetration resistance is related to energy absorption mechanism of each substrate;the forms of energy absorption of steel plates include partial deformation and shear plugging. Energy consumption of steel plates is hardly affected by coating. Polyurea coating can improve penetration resistance of coated steel plates and the effect of front-side coating is superior to that of back-side coating;back-side coating can inhibit the energy absorption of fiber plates and significantly reduce penetration resistance.