This report focuses on approaches for assessing the effect of explosive power on shaped chargeperformance, primarily jet velocity and elongation. A finite difference computationalmethodology within ANSYS AUTODYN allows for tracking liner mass, in a manner thatpermits one to estimate all vectors of the classical PER triangle based on dynamic motion of eachmass element in a finely zoned 2D Eulerian solver. Stagnation motion is tracked and referencedto the exact coordinates and time that material is accelerated into jet. Jet stability appears to abidewith the Harrison postulated limiting flow rate condition for copper, taking into account derivedjet and stagnation velocities. A 90-degree conical liner solution in an overdriven LX-14 charge at10.7 km/sec detonation velocity was successfully designed yielding a jet at tip velocity between11.4 and 11.5 km/sec. An empirical relationship between stagnation and detonation velocities at0.55 in coherent jetting is proposed.
展开▼
