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Air cannon simulation test method is a common method to generate high overload signal. In this paper, a new impact body model for air gun test is proposed. Based on the model, the impact dynamic theory is analysed, and the variation law of high overload signal in accelerometer due to multiple reflection and transmission of stress wave in the impact process is studied. The finite element model is established by using ANSYS / LS-DYNA software to simulate and analyse the impact process, and a test platform is built to verify the simulation. The test results and simulation results show that the impact body can generate a “W” shape high overload signal during the impact process, which also verifies the rationality of the theoretical analysis. The methods and conclusions of this paper have certain significance for the study of the new type of impact body and the high overload signal produced by the impact test.

Oblique deep penetration is a common form of projectile penetration into the target. In view of the fact that most of the research work is focused on the trajectory of vertical penetration, the trajectory and law of oblique penetration are discussed in this paper. This paper studies the impact of different initial angles of attack on projectile trajectory and fuze impact in oblique penetration by simulating projectile penetrating target with LS DYNA software. The results show that with the increase of attack angle, the deflection of trajectory is more obvious, the penetration depth is smaller, and the impact acceleration amplitude of fuze is larger. The research content of this paper provides a reference for oblique penetration of concrete target and impact performance of fuze, and is of great significance for the construction and protection of underground fortifications.