**4. Conclusions**

In this work, finite element analysis was used to study the effects of peen patterning on the residual stress fields induced by laser peening of thin aluminum plates. The accuracy of the model was confirmed using experimental measurements of residual stress obtained by incremental hole drilling. The following conclusions can be drawn:


**Author Contributions:** All authors contributed to the conceptualization, methodology, and review and editing of the manuscript. T.J.S. developed the fundamental models and parametric studies. K.L. undertook the advanced model development and simulation. M.E.F. was responsible for providing calibration and validation data, along with funding acquisition. K.L. and M.E.F. were responsible for preparation of the initial draft of the manuscript. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research study was sponsored by the Air Force Office of Scientific Research, Air Force Material Command, USAF, under gran<sup>t</sup> number FA8655-12-1-2084, and the Air Force Research Laboratory's Aerospace Systems Directorate. The U.S. Government is authorized to reproduce and distribute reprints for Government purpose notwithstanding any copyright notation thereon. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the Air Force Office of Scientific Research or the U.S. Government. MEF is grateful for funding from the Lloyd's Register Foundation, a charitable foundation helping to protect life and property by supporting engineering-related education, public engagemen<sup>t</sup> and the application of research.

**Conflicts of Interest:** The authors declare no conflict of interest.
