PSI - Issue 14

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

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Fig. 3. (a) 3-D modeling of rectangular section explosive Charge; (b) 3-D modeling of ‘V’ section Explosive Charge.

2.3 Modelling of 3-D bar explosive charge (RDX/TNT) with rectangular and ‘V’ section The explosive charge of rectangular section 100 mm × 45 mm × 1200 mm was modelled using symmetry about XY and YZ plane as shown in Fig. 3(a). Similarly 100 mm × 60 mm × 1200 of ‘V’ section with half angle of 60 0 were modelled. The explosive charge quantities in both the cases were kept same by adjusting the height of section and half angle of ‘V’ section. The explosive RDX/TNT (60/40) was used. The 3-D Euler square domain of 100 mm × 150 mm × 700 mm size was created. The cell size of 1 mm was kept. The air as ideal gas was filled round the charge. The pressure gauge at 70 mm distance from the base of charge was kept at various distances along the length of explosive charge. The pressure pulse was recorded at these gauges. 2.4 Simulation Results Effect of Angle on pressure was observed on the pressure generated at the distance of 70 mm from the base for three different charge shape i.e. rectangular section of 100 mm × 45 mm × 1200 mm, ‘V’ section with 100 mm × 45 mm × 1200 with 60 0 half angle (‘V’ section (45)) and 100 mm × 60 mm × 1200 mm with 59 0 half angle (‘V’ section (60)). The pressure obtained at the 60 o half angle was maximum as shown in Fig. 4.

Fig. 4. Pressure pulse recorded for rectangular (Flat), ‘V’ section of explosive charge.