基于碎片尺寸分布的活性材料冲击释能计算

Aiming at the dynamic fragmentation characteristics of reactive material and its effect on the impact energy release behavior,two types of reactive materials,Al / Ti and Al / Ti / W,are selected as the research subjects. Dynamic fragment soft-recovery test is conducted to obtain the fragment size distribution characteristics of reactive material at different impact velocities. Additionally,the impact-induced energy release test is performed to analyze the impact pressure characteristics and reaction processes of Al / Ti and Al / Ti / W. Based on these investigations, a calculation method for impact pressure, which considers material fragmentation characteristics and the critical size of the reaction,is proposed. The results indicate that the fragmentation characteristics of reactive material are crucial in influencing its impact energy release behavior. The cumulative size distribution of fine fragments formed after the impact fragmentations of both Al / Ti and Al / Ti / W materials can be described using a Logistic distribution function. The impact reaction process of reactive material in a reaction chamber can be divided into primary and secondary reaction stages. The calculation error of the proposed calculation method is less than 15% when calculating the quasi-static pressure during the primary reaction stage.