100.0 sec 110.5 sec 163.0 sec 200.0 sec Figure 4: Damage sequence in random mat composites, Vf =10%, 0 Æ notch, 25 mg PETN charge 99.0 sec 126.5 sec 150.0 sec 205.0 sec Figure 5: Damage sequence in random mat composites, Vf =10%, 15 Æ notch, 25 mg PETN charge projection of the 3D damages. Establishing the relationship between the shadow areas and the 3D fracture surface area is quite challenging and requires further work. ACKNOWLEDGMENT Thepartial nancialsupportfromNationalScienceFoundation,USAandAeronauticsResearchand Development Board (Structures Panel), Govt. of India are gratefully acknowledged. References [1] Shukla, A. and Khanna, S.K. (1993) Trans. ASME J Eng. Mat. Tech. 115, p140. [2] Khanna, S.K. and Shukla, A. (1994) Exp. Mech. 34, p171 [3] Agarwal, B.D., Sharma, R. and Bajpai, K.K. (1995) Mech. Comp. Mat. Struct. 2, p295 [4] Ravi, S., Iyengar, N.G.R., Kishore, N.N. and Shukla, A. (Accepted for publication) App. Comp. Mat.
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