The Gurney equations are a set of mathematical formulas used in Explosives engineering to relate how fast an explosive will accelerate a surrounding layer of metal or other material when the explosive detonates. This determines how fast fragments are released by military explosives, how quickly shaped charge explosives accelerate their liners inwards, and in other calculations such as explosive welding where explosives force two metal sheets together and bond them.
The equations were first developed in the 1940s by R.W. Gurney and have been expanded on and added to significantly since that time.
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