Study on damage and hot spot generation of explosive charge during penetration

DOI:	10.11809/bqzbgcxb2024.02.003
Keywords:	warhead charge; penetrating stability; micro defect damage; hotspot generation; constitutive mode
Abstract:	This paper focuses on predicting damage and stability of the PBX charge in the process of warhead penetration. The damage evolution and the mechanism of hot spot generation in warhead charge was studied by using PBX Microcrack Microvoid damage ignition model. The influence of different temperature rise mechanisms on hot spot generation during warhead penetration was analyzed. Besides, the effect of the presence or absence of buffer material at the front of the warhead on the mechanical damage and ignition response of the charge was studied. The results show that the charge in the warhead undergoes multiple compression rebound processes during the penetration process. This repeated loading and unloading status contributes to the accumulation of the damage of micro defects including the micro cracks and the collapse of holes inside the charge, which leads to hot spots in the head and tail of the charge. The heat generation caused by microcracks friction is the dominated temperature rise mechanism in the PBX charge. The addition of buffer material can effectively reduce the damage of charge, temperature rise amplitude of hot spot and hot spot density of crack, and can effectively reduce the temperature rise of hole collapse and macroscopic body temperature rise of charge head.
Issue:	Vol. 45 No. 2 (2024)
Published:	2024-02-28
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