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With-Fracture Gurney Model to Estimate both Fragment and Blast Impulses

Hutchinson M. D.

Central European Journal of Energetic Materials

2010

Vol. 7, nr 2

175-186

Work to extend Gurney’s model for fragment velocity to predict blast impulse is ongoing by means of analytical calculations, based on gas and casing dynamics, with comparisons to available experimental data. The issue of early case fracture, with release of explosive gases thus retaining a greater degree of momentum, is also addressed. The method is based on that of G.I. Taylor and can include both case material compressive fow stress and explosive properties such as Chapman-Jouguet pressure. Comparisons between this new Taylor-based theory and blast data from studies of cased charges are shown. The potential effects on blast output of casing dynamic material properties appear considerable. Dynamic testing of case metals is needed to confrm the yield stresses implied by the blast data. It is expected that this method will be useful to the researcher in a number of roles.