复合弹丸撞击涂层钢板的力学过程研究

Research on Mechanical Process of Composite Bullet Impacting Steel Substrate Covered with a Film

研究弹丸涂层结合强度准确评价问题,针对评价涂层结合强度的复合弹丸撞击特性。由于系统存在非线性,传统拉应力脉冲方法,应力幅测量不清。为解决上述问题,首先搭建了试验平台,试验验证了弹丸冲击法的可行性,并改进了相应的测试系统。利用有限元软件ANSYS对复合弹丸撞击涂层钢板进行了数值仿真。分析了基体厚度、弹头薄膜与钢板涂层厚度的比值对界面法向应力的影响。结果表明:界面法向应力随着基体厚度的增加而变小,弹头薄膜与钢板涂层厚度之比约为1.5∶1时出现最大的界面拉应力,可为实际工程提供参考。

Aiming at the problem of projectile impact substrate covered with a thin film to assess the bonding strength, first of all, we buih a test platform to verify the feasibility of the method of projectile impacting and put for- ward the corresponding test system to test the normal stress of the specimen. In the next place, the process of projec- tile impacting against the substrate covered with a coating was simulated by using transient explicit finite element code ANSYS/LS - DYNA. The influences of the base thickness and the ratio of film and the substrate on the interface nor- mal stress were analyzed by means of numerical simulation. The results show that normal stress of the interface is smaller with the increasing of the thickness of the substrate, and the tensile stress between substrate and film is maxi- mal when the ratio of the film and the substrate is about 1.5： 1.