Hard target defeat (HTD) requirements are getting more and more challenging. On the way to the hard and deeply buried target-room, usually several layers of very high strength concrete slabs (up to 200 MPa unconfined compressive strength) or even rock blocks have to be perforated. The answer to these intensified requirements is a fast supersonic penetrator (~ 1200 m/sec). But each time a target layer is hit and perforated by such a penetrator, shock loads are coupled into the high explosive (HE) filling via the casing - and, with increasing impact velocities also the shock loads increase. The arising question was: what does that mean for the HE -its microstructure and its sensitivity - being shock loaded several times? Numerical simulations revealed shock peak pressures of several kilobars which could lead to premature detonation, especially when the sensitivity successively increases from target layer to target layer.
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