Energy Per Unit Hole Volume

Amount of explosion energy required to blast a volume of hole in shaped charge studies, from Fundamentals of Shaped Charge Penetration in Concrete1 - Michael J. Murphy Robert M. Kuklo Lawrence Livermore National Laboratory P.O. Box 808, L-282, Livermore, CA 94550 1-925-423-7049, mjmurphy@llnl.gov

Note:

energy in the jet is one of the primary factors that determine the overall target damage. We have found that using the “energy per unit hole volume” (E/V) relationship results in fairly accurate predictions of the hole profile. However, it is extremely important to use a target strength adjusted E/V as well as the correct jet energy.  The correct jet energy is the from the portion of the jet that actually reaches the bottom of the hole and contributes to damaging the target.  The correct E/V is a function of the target strength. In one of our initial studies we found the E/V for 3000 psi concrete was 360 J/cc [4].  In subsequent studies we found an E/V as high as 700 J/cc for 9000 psi concrete with a linear interpolation for intermediate strength targets.

Conclusion:

Jet penetration in concrete is basically the same as jet penetration into armor steel.