L-284 Critical Diameter and Shaped Charge Jet Impact

This report provides supporting data and references for the 50 mm critical diameter engineering “rule-of-thumb” applicable to passing the shaped charge jet impact (SCJI) Insensitive Munitions (IM) threat test defined in AOP-4526. If a munition subject to this test contains an energetic material with a critical diameter larger than 50 mm, it is likely that the munition will pass. However, if the munition contains an energetic material with a critical diameter less than 30 mm, it is likely that it will fail.  If the critical diameter is between 30 and 50 mm, there is a possibility that the munition may pass.

 

In addition, information is provided on a critical diameter / gap test result correlation that can be used to estimate critical diameters if NOL LSGT or IHEGT data is available.