관통 형상과 파편 분산범위 분석을 통한 초기 충격자 형상과 충돌 속도 예측

초록

High velocity impacts generate not only the penetration and the destruction in structures but also much debris within the structures and the debris cause the secondary impact phenomena. Therefore, in order to protect the structure and system under various impact conditions, it is necessary to analyze penetration shapes and debris dispersion range caused by the impactor with various shapes, and hence the initial impact condition should be predicted. In this study, penetration shapes and debris dispersion ranges of aluminum plates caused by the high velocity impacts were analyzed, and the initial impact shape together with the velocity of the impactor were predicted. Firstly, the impact analysis was performed on the spherical aluminum impactor (diameter: 4 mm, initial velocity: 4 km/s) with aluminum plate (thickness: 2 mm), and then the debris dispersion range by a numerical analysis were compared with Zhang’s experimental result. Secondly, a virtual circle that includes 30%, 50%, and 95% of the total debris from the center of the debris dispersion range was respectively designated, and the shape of the initial impactor was predicted. Finally, the impact velocity of the initial impactor was predicted based on the modified De Marre’s equation considering the diameter of the penetration hole and the shape correction factor. In consequence, the initial impactor shape and the initial impact velocity were favorably predicted within approximately 6.4 % and 0.1% range. It is thus thought that the analysis methodology, presented in this study, regarding the penetration shapes and the debris dispersion range can be used to predict the initial shape and impact velocity of the other impactor

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