PSI - Issue 14

Pankaj K. Choudha et al. / Procedia Structural Integrity 14 (2019) 191–198 Pankaj K Choudha/ Structural Integrity Procedia 00 (2018) 000–000

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Fig. 1. (a) 2-D modeling of RDX/Wax (95/5) Charge; (b) Pressure Pulse at 1 m from Autodyne and Experiment.

2.2 Modelling of large quantity of explosive charge RDX/TNT with booster charge of RDX/Wax The explosive charge Comp–B RDX/TNT (60/40) of Ø250 mm and 94.5 mm height with a cavity of Ø40 mm was modelled as shown in Fig. 2. (a). The booster charge RDX/Wax (95/5) of Ø40 mm and 55 mm height was fitted centrally. The charge was encased in 3 mm polyethylene casing. The total mass of explosive is 7.45 kg. The 2-D Euler square domain of 600 mm × 600 mm size was created for obtaining near field pressure. The cell size of 1 mm was used. The air as ideal gas was filled round the charge. The JWL properties of RDX/TNT (60/40) are given in Table. 3. Table 3. JWL Material Parameters for Comp-B (RDX/TNT) (60/40). ρ e a b R 1 R 2 ω D E Pcj 1.68 ×10 3 5.242×10 11 7.678×10 10 4.2 1.1 0.34 7500 8.3×10 09 2.58×10 10 The blast pressure generated by the charge was further mapped to Ideal gas Euler space of 500mm × 4500mm. The cell size of 5 mm was used. The pressure pulse was recorded at 3 m and 4 m distance from simulation. The pressure pulse recorded using side on pressure gauges was super imposed in Fig. 2. (b). with the simulation pressure pulse. The blast prssure for far field were matched for this charge.

Fig. 2. (a) 2-D modeling of RDX/TNT (60/40) Charge; (b) Pressure Pulse at 3 m and 4 m from Autodyne and Experiment.