Е. А. Gachegova, I. M. Vinogradov, А. Yu. Iziumovа, A. N. Vshivkov, М. L. Bartolomei, I. S. Kudryashev, О. А. Plekhov, S. V. Zherebtsov

COMPARATIVE ANALYSIS OF METHODS FOR MEASURING RESIDUAL STRESSES IN A NICKEL ALLOY AFTER LASER SHOCK PEENING

The aim of this study is to evaluate the correlation of residual stress profiles obtained by the method of X-ray diffraction with layer removal and the hole-drilling method and to validate the numerical model of the residual stress formation process in Inconel 718 nickel alloy plates after laser shock peening. Three laser shock peening modes, differing in power density and the number of processing layers, are used to generate residual stress fields of different depths and magnitudes. It has been found that a direct quantitative comparison of these methods is incorrect due to differences in their physical principles. It is shown that the hole-drilling method is more indicative of the effect of the processing modes on residual stress profiles since it is sensitive to the plastic strain induced by intense laser shock loading. Based on the experimental data obtained by this method, the numerical model has been validated. It has been proved that a single set of model parameters provides an adequate prediction of residual stress fields when the laser shock peening process parameters are varied.

Acknowledgment: The study was made under the government’s assignment, theme registration number 124020700047-3.

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