PSI - Issue 14

D R Makwana et al. / Procedia Structural Integrity 14 (2019) 44–52 D R Makwana, Dr D G Thakur, K Senthilkumar/ Structural Integrity Procedia 00 (2018) 000–000

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Fig. 1. Blast wave pressure-time history

4. General Generation and propagation of shock wave

Fig. 2. Shockwave development (a) Initial Pulse (b) Intermediate (c) Final pulse

As shown in Fig. 2, the shockwave travels with a speed of sound. The speed of the sound is the function of local pressure and temperature. An idealised pressure pulse is shown in Fig. 2(a). There is different pressure for all three stages hence the speed of the sound is different in each case. The pressure pulse increases with the increase in the pressure and becomes steep. The pressure pulse takes a smooth curve during an intermediate stage. As shown in Fig. 2(c), the pulse reaches the peak and starts decay. This is called shock wave. 5. Process of Blast Interaction with Vehicle Structure Madhu and Bhat (2011) have described that the main mechanisms that can be incorporated into the design of vehicles and equipment to render protection against the blast effect of mines are; a) Absorption of energy b) Deflection of blast effect away from the hull c) Keep adequate stand-off between target structure and blast initiation point