Engineering Mechanics

Proceedings Vol. 27/28 (2022)

ENGINEERING MECHANICS 2022

Copyright © 2022 Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prague

 

Maršík F.
pages 253 - 256, full text

The movement of dislocations can be characterized by the viscosity depending on the rate of deformation. In this way, the material strengthening is explained by overcoming atomic bonds, which coressponds to the hardening work. The movement of dislocations can be modeled by shear waves, which are strongly dispersive. In areas of high viscosity (before the shock wave) they precede the pressure shock wave. The concept of shear waves allows to describe with some accuracy the strengthening of the material due to extremely fast compression. The presented analysis shows, that to achieve a higher residual stress at the same laser energy, it is more advantageous to use a pulse of shorter length. For greater depth of reinforcement, it is necessary to use a longer pulse. Currently, an experiment is always needed to model Laser Shock Peening (LSP). The experimental residual stress data used were provided by the HiLASE Center of the Institute of Physics of the CAS. After the calibration, the LSP process can also be used to determine the properties of the material under extremely fast loads.

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