PSI - Issue 14

Kartikeya et al. / Procedia Structural Integrity 14 (2019) 514–520 Kartikeya/ Structural Integrity Procedia 00 (2018) 000 – 000

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Once the model was validated against experiment, steel plate was replaced by layered plates as shown in Figure 4. This was made of two and four steel plates of same material having thickness equal to half and quarter of the original plate respectively. Layered plates performed worse than monolithic targets under ballistic impact with respect to maximum central deflection with four-layered worse than two-layered. It was also observed that layered plates performance degraded with decreasing the thickness of each constituent plate. Results for two-layer configuration are shown in Table 4. Also, solution converged for greater element length for layered plates.

Figure 4. Layered Configurations a) Two-plate layered configuration b) Four-plate layered configuration.

Table 4. Numerical model results for 2 layered plate configuration. Element size in mesh (mm) Max. Central Deflection (mm)

Difference with experiment (mm)

Percentage Error (%)

5 mm 2 mm

17.47 18.46

0.28 0.71

19.09 26.69

Next, laminated plates were considered with default cohesive contact enforcement method available in Abaqus to mimic situation where thinner plates were bonded with an adhesive. Maximum central deflection was reduced considerably to 14.45 mm. Also, deformation pattern changed as shown in Figure 5.

Fig. 5. Equivalent plastic strain at the end of simulation for laminated plates.