Abstract
Laser shock processing (LSP) is a mechanical surface treatment to induce a compressive residual stress state into the near surface region of a metallic component. The effect of the cyclic deformation properties of ductile materials on the final residual stress fields obtained by LSP is analysed. Conventional modelling approaches either use simple tensile yield criteria, or isotropic hardening models if cyclic straining response is considered for the material during the peen processing. In LSP, the material is likely to be subject to cyclic loading because of reverse yielding after the initial plastic deformation. The combination of experiment and modelling shows that the incorporation of experimentally-determined cyclic stress-strain data, including mechanical hysteresis, into material deformation models is required to correctly reflect the cyclic deformation processes during LSP treatment and obtain accurate predictions of the induced residual stresses.
| Original language | English |
|---|---|
| Pages (from-to) | 370-381 |
| Number of pages | 12 |
| Journal | International Journal of Mechanical Sciences |
| Volume | 156 |
| Early online date | 28 Mar 2019 |
| DOIs | |
| Publication status | Published - 1 Jun 2019 |
Bibliographical note
NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Mechanical Sciences. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Mechanical Sciences, [156], (2019) DOI: 10.1016/j.ijmecsci.2019.03.029© 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Funding
This research effort was sponsored by the Air Force Office of Scientific Research , Air Force Material Command, USAF, under grant number FA9550-14-1-0415 , and the Air Force Research Laboratory's Aerospace Vehicles 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. The authors would like to thank Dr Markus Heinimann at Alcoa Inc. (now Arconic) for the provision of the material studied in the project. 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 engagement and the application of research. Work partly supported by MINECO (Spain; Projects MAT2012-37782 and MAT2015-63974-C4-2-R ).
Keywords
- Cyclic hardening
- Finite element analysis
- Laser shock processing
- Residual stress
- Shock waves
ASJC Scopus subject areas
- Civil and Structural Engineering
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
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