Analysis of Impact Initiation of Explosives and the Currently Used Threshold Criteria.

摘要

This work ties together published experimental and theoretical results concerning the threshold condition for initiation of explosives during impact and/or penetration by projectiles or shaped charge jets. The shape of a projectile's 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.