In an effort to understand the mechanisms which cause munitions impacted by fragments to detonate, we conducted a test series in which we impacted 105-mm HEP warheads (Comp B loaded) by flat-faced cylindrical steel projectiles. The velocity of the projectile was varied in order to determine a 50% velocity for detonation. We instrumented our test with an external blast pressure probe and an internal carbon resistor gage so that we ...