高硬度聚脲涂层抗侵性能与断裂机制研究

In view of its differences from the conventional polyurea elastomer, we investigated the penetration resistance and fracture mechanism of coatings made from high-hardness polyurea sprayed on steel plates, using the ballistic experiment to obtain the ballistic limit of uncoated and coated steel plates subjected to 3.3 g cubic fragments, in consideration of polyurea coatings on the front side, the back side and on both sides in coated plates. We also analyzed the penetration resistance, fracture patterns and micro-morphologies of the coatings in different coated structures. The results indicate that the front coatings with severe fractures exhibited a high energy absorption capability, thereby improving the penetration resistance of the coated plates whereas, however, the back coatings that had been destroyed before the steel plates exhibited a lower energy absorption capability, which was bad for raising the penetration resistance. Under the fragment impact, polyurea coatings exhibited obvious velocity effects, thickness effects and micro-morphological characteristics, reflecting the differences of energy absorption in each configuration.