1. Former Professor, Institute of Armament Technology, 925 Scientist Hostel—III, DRDO Township, C.V. Raman Nagar (PO), Bangalore 560 093, India (corresponding author). E-mail: mganapathi@rediffmail.com
2. Research Scholar, Dept. of Applied Mechanics, IIT Delhi, Hauz Khas, New Delhi 110 016, India.
3. Research Scholar, Dept. of Aerospace Engineering, IIT Madras, Chennai 600 036, India.