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. 5. Components of the stress and strain in the plate fracture zone as a function of time for dynamic perforation by hemispherical punch.

Fig. 6. The plate, perforated by a hemispherical punch from the numerical simulation (a) and experiment (b). Comparison of calculation and experimental loading diagrams F(l) (c).

To investigate the contact condition effect on the calculation results, numerical modeling was carried out with different values of the friction coefficient for dynamic and static perforation by a hemispherical punch. Figure 7 illustrates the loading diagrams F (l) for comparing the results using the values k = 0 and 0.25. It indicates that for dynamic perforation (Fig.7(a)) at k = 0.25, the maximum value of the force is higher than at k = 0, and fracture occurs later by about 80 μs. In the calculation of static perforation (Fig.7(b)), the friction coefficient also affects the obtained results, especially after fracture initiation.