PSI - Issue 47

Dmitry Ledon et al. / Procedia Structural Integrity 47 (2023) 213–218 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

217

5

4. Results Three different barrier thicknesses (1 mm, 0.3 mm, 0.1 mm) and three different pulse amplitudes (1 GPa, 10 GPa, 50 GPa) are considered. The simulation results are presented in Table 1. Only in one case there are no signs of spall fracture. In five cases, signs of spall fracture are observed, but spall does not occur. The absence of a spall in this situation is related to the geometry of the problem. Namely with the fact that the radius of the zone of influence is much less than the radius of the target. In the two cases considered spall fracture occurs. And in one of the options the target is punched.

Table 1. Simulation results. Pressure amplitude / Barrier thickness

1 GPa

10 GPa

50 GPa

1 mm

No signs of spalling

There are signs of a spalling There are signs of a spalling

Multiple damage. No spall fracture

0.3 mm

There are signs of a spalling There are signs of a spalling

Spall fracture

0.1 mm

Spall fracture

The barrier has been broken

Some typical calculations are shown in fig. 4. Figure 4 shows that, at the pressure pulse amplitude of 10 GPa and the barrier thickness of 1 mm, signs of spall fracture appear, while spalling occurs at a thickness of 0.1 mm.

Fig. 3. Results of numerical calculations. On the left, the barrier thickness is 1 mm, the pulse amplitude is 10 GPa. On the right, the barrier thickness is 0.1 mm, the pulse amplitude is 10 GPa 5. Conclusions Laser induced shock wave loading is analyzed numerically with the aim to predict the conditions of the spall failure initiation to avoid these regimes in Laser Shock Peening processing of materials. Numerical simulation made it possible to reveal the loading regimes and the radius of the zone of pulse initiation providing the conditions when spall failure does not occur. Acknowledgements This research was supported by the Russian Science Foundation (project 21-79-30041), https://rscf.ru/en/project/21-79-30041/