High strain-rate material model validation for laser peening simulation

K. Langer, S. Olson, R. Brockman, W. Braisted, T. Spradlin, Michael E. Fitzpatrick

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Abstract

Finite element modeling can be a powerful tool for predicting residual stresses induced by laser peening; however the sign and magnitude of the stress predictions depend strongly on how the material model captures the high strain rate response. Although a Johnson- Cook formulation is often employed, its suitability for modeling phenomena at very high strain rates has not been rigorously evaluated. In this paper, we address the effectiveness of the Johnson-Cook model, with parameters developed from lower strain rate material data (∼103 s–1), to capture the higher strain rate response (∼105–106 s–1) encountered during the laser peening process. Published Johnson-Cook parameters extracted from split Hopkinson bar testing were used to predict the shock response of aluminum samples during high-impact flyer plate tests. Additional quasi-static and split Hopkinson bar tests were also conducted to study the model response in the lower strain rate regime. The overall objective of the research was to ascertain whether a material model based on conventional test data (quasi-static compression testing and split Hopkinson bar measurements) can credibly be used in FE simulations to predict laser peen-induced stresses.
Original languageEnglish
JournalThe Journal of Engineering
VolumeSeptember 2015
DOIs
Publication statusPublished - 2015

Bibliographical note

This is an open access article published by the IET under the Creative Commons
Attribution License (http://creativecommons.org/licenses/by/3.0/).

Keywords

  • laser peening
  • modelling

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