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In order to analyze the quality distribution of behind-armor debris and explore the source of debris, experimental and simulation studies on vertical penetration of armor steel by explosively formed penetrator (EFP) were carried out. With the help of experimental and verified simulation methods, the results were analyzed under different target thickness (10- 70 mm) and different EFP target hitting speed (1650m/s~1860m/s). After a typical EFP penetrates armor plate vertically, the quality distribution of target debris produced by EFP is analyzed. The results show that when the EFP’s impact velocity is 1650m/s and the target thickness is between 10mm and 70mm, the proportion of debris with quality less than 1g in the total fragment number decreases with the increase of the target thickness. When the thickness of the target plate is 40mm and the EFP’s impact velocity is between 1650m/s and 1860m/s, the impact velocity has limited influence on the fragment behind the target.

The purpose of this study is to analyse how the thickness of Rolled Homogeneous Armor (RHA) and impact velocity of an Explosively Formed Projectile (EFP) influence the middle mass behind-armor debris (BAD) when a variable cross-section EFP penetrates RHA normally. Numerical simulation is adopted, the thickness of RHA varies from 10mm to 70mm, and the impact velocity of the EFP varies from 1650m/s to 1860m/s. The results indicate that: (1) when the impact velocity of the EFP is 1650m/s and the thickness of RHA varies from 10mm to 70mm, p1g of the RHA and EFP decreases with increasing H0. The thin target could be used to produce a large proportion of the middle mass BAD from RHA (including BAD from the EFP and BAD from the RHA and EFP). (2) When the impact velocity of the EFP varies from 1650m/s to 1860m/s and the thickness of the RHA is 40mm, p1g of the RHA is less than 50%, p1g of the EFP is more than 70%, and p1g of the RHA and EFP is more than 50%.