An Analysis of Impact Initiation of Explosives and the Currently Used Threshold Criteria
Final rept. Jan 1989-Feb 1990
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ ARMAMENT ENGINEERING DIRECTORATE
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This work ties together published experimental and theoretical results concerning the threshold condition for initiation of explosives during impact andor penetration by projectiles or shaped charge jets. The shape of a projectiles tip, which may effect either pressure if pointed or duration if rounded, has well known strong effects on the threshold velocity. A qualitative analysis is incorporated which satisfactorily relates these effects to results obtained with flat nosed rod impacts. Further, evidence is presented that even shaped charge jets display a significant nose shape effect, which adds complication to evaluating the response of explosives to jets. There is a strong, convincing evidence that for each impactor effective diameter, a certain threshold pressure is required for initiation. However, some nominally conflicting data exist and are discussed.
- Ammunition and Explosives