PSI - Issue 36

Valeriy Kharchenko et al. / Procedia Structural Integrity 36 (2022) 137–144 Valeriy Kharchenko, Eugene Kondryakov, Oleg Katok et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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Fig. 7. Comparison of loading diagrams F (l) based on the results of numerical simulation of dynamic (a) and static (b) perforation by a hemispherical punch with friction coefficients k = 0 and 0.25.

The obtained calculation results were used to develop the experimental technique for dynamic perforation tests. The striker design is complex, so it is advisable to use a striker consisting of two parts; the main striker with a flat tip that loads the punch, which perforates the specimen. The additional calculations were performed for this design scheme (Fig.8(a)). The results showed that the level of oscillations increases for the striker, but it has almost no effect on the maximum values of the forces (Fig.8(b)). The support and punches of various shapes were produced for further experimental investigations of deformation and fracture of high-strength and armored materials under dynamic perforation (Fig.9).

Fig. 8. FE model of dynamic perforation with separate punches (a) and calculation loading diagrams F(l) (b).