The Combined Performance Of The Metal Coating The Composite Projectile Impact Study

A new method of a composite bullet impact against the metal covered with a film is proposed to analyze and research the bonding strength between the metal and film. The work contains two aspects both in theory and experiment.A one-dimensional model is established by the theory of Stress-wave in order to find the rule of the process of composite projectile impacting. Secondly, establish an experimental system of this new method. A ballistic gun is used to launch bullet with a metallic coating to impact the specimen. The result is that the film is falling from the metal and it verifies the feasibility of this method. For this reason, the process of projectile impacting against the specimen is also simulated by using transient explicit finite element code ANSYS/LS-DYNA. Base qualitative analysis of the thickness, the ratio of film and the substrate and the velocity of bullet on the interface normal stress and substrate stress by means of numerical simulation. Analyze the performance of combination when the substrate is covered with different films, for example, the nickel or the ceramic film. Make a contrast and analyze shell elements and solid elements which used to simulate the coating and film in order to get the accurate result of numerical simulation. Theoretical arithmetic of stress wave and numerical simulation are combined to comprise and analyze. At last, put forward a stress test system, describe the test principle and analyze PVDF piezoelectric sensors to measure different characteristics of the circuit mode, and uses the software of Multisim to do circuit simulation and analysis.