Premium
Critical energy criterion for the shock initiation of explosives by projectile impact
Author(s) -
James H. R.
Publication year - 1988
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.19880130202
Subject(s) - projectile , explosive material , shock (circulatory) , rod , mechanics , energetic material , materials science , physics , chemistry , alternative medicine , organic chemistry , pathology , metallurgy , medicine
The critical energy (Ec) criterion developed by Walker and Wasley for predicting the response of bare, heterogeneous explosives to flying‐plate impact, is modified for application to flat‐nosed rods and spherical projectiles. This modification redefines the shock duration term used in calculating Ec and implies that a minimum volume of explosive at a given shock energy is needed before initiation occurs. The modification also changes the L/D ratio of the projectile at which plate behaviour changes to rod behaviour from the currently accepted value of approximately 1/4 to 1/12. Comparisons between the modified criterion and published experimental data show that the same value of Ec can now be obtained from both flying‐plate and more complex projectile impacts into the same explosive.