PSI - Issue 60

Prince Jeya Lal Lazar et al. / Procedia Structural Integrity 60 (2024) 185–194 Author name / Structural Integrity Procedia 00 (2019) 000–000

189

5

d

e

f

Fig. 4 Numerical validation of surface explosion at a standoff distance of 100 mm and core thickness t = 0.76 mm for (a) 1 kg TNT (b) 2 kg TNT (c) 3 kg TNT (a-c) from [19] and (d-f) present simulation Table 3 Validation of front face midpoint deflection for front face sheet thick - 5 mm, core height – 51 mm, standoff distance – 100 mm, and core thick – 0.76 mm

Front face midpoint deflection (mm)

Charge Mass (kg)

Impulse (kPa s)

Numerical (present simulation)

Experimental [2]

Numerical [4]

1 2 3

21.5 28.4 33.7

47.06 98.82

69.25 111.5 141.2

69.15

110.68 141.37

158.04

4. Results and discussion This section presents the results of surface and underwater explosions. A series of simulations were performed for different shock factor values achieved by varying the mass of the explosive and standoff distance. In addition, the shell thickness of the sandwich core was varied to understand the structural integrity of the panel. The huge amount of energy generated during an explosion event compresses the surrounding fluid medium to generate a shock wave that strikes the front face of the panel. This shock load induced a plastic deformation on the front face of the panel which is resisted by the core leading to progressive crushing of the core. The undissipated blast energy is finally