PSI - Issue 35

Deniz ÇelikbaŞ et al. / Procedia Structural Integrity 35 (2022) 269 – 278 D. C¸ elikbas¸ / Structural Integrity Procedia 00 (2021) 000–000

278

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results of Toussaint and Polysois (2019). With the validated ceramic tile model, we explore the e ff ect of spherical surface profiling and bullet hitting location. From the results of this study, the following conclusions can be drawn:

• Various sphere radius values ranging from 0 (flat) to 7 mm are examined, and it is observed that the ballistic performance of the ceramic tiles can be increased up to 56% when the radius of the spherical surface profile is 4.5 mm . • Except for the 5.5 mm sphere radius surface profiled plate, the best SKEA results are achieved when the pro jectile hits the gap between the four spheres. For the 5.5 mm sphere radius surface profiled plate, on the other hand, the best SKEA is achieved when the projectile hits the intersection of two spheres. • For radius values of 3.5, 4, 5, and 5.5 mm , the worst SKEA result is obtained when the projectile hits the top of the sphere. For the radius value of 4.5 mm , however, the worst SKEA result is obtained when the projectile hits in the middle of the top and the intersection of two spheres. • Regardless of the hitting point, the ballistic performance is better than the flat plate because the worst result is 21% better than the flat plate. This study can be extended to investigate di ff erent surface profile shapes, such as the square pyramid and rectangular prism. Furthermore, the state-of-the-art optimization techniques can be used to find the optimum surface profiles.

Acknowledgements

The authors would like to thank Mr. Ameen Topa regarding his fruitful discussions on SPH modeling.

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