PSI - Issue 14

C.Jayarami Reddy et al. / Procedia Structural Integrity 14 (2019) 634–641 C.Jayarami Reddy/ Structural Integrity Procedia 00 (2018) 000–000

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3. Results & Discussions The explosive air blast experiments were conducted on H-glass/epoxy and E-glass/epoxy composites as per the experimental conditions mentioned in Table 2. As shown in table 2, two sets of air blast conditions were applied on both composites and the corresponding pressure - time history profiles were recorded. The incident pressure profiles of shock waves, recorded at 400mm and 300mm SoD using two mutually perpendicular pencil probes are shown in figure 3(a) and 3(b), respectively. The reflective pressure –time history profile of the same explosive at 400mm and 300mm SoD, which are recorded using the pressure sensors are shown in figures 4(a) and 4(b), respectively. The peak incident and peak reflected pressures recorded in all the experiments against different loading conditions are tabulated in Table 2. The final displacements on both front and back sides of the target plates, that are exposed to the different shock pressures were measured and recorded in the table. The failure mechanisms of both H and E-glass composites at different blast loadings were discussed and compared in this section.

Fig. 3. Pressure-time profiles of incident shock wave of 142 grams of charge mass (a) at 400mm SoD; (b) at 300mm SoD.

Fig.4. Pressure-time profiles of reflected shock wave of 142 grams of charge mass (a) at 400mm SoD; (b) at 300mm SoD.