München 2019 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 6: Laser Applications I
K 6.1: Talk
Wednesday, March 20, 2019, 11:00–11:20, HS 3
Global modelling of the ns-laser shock peening — •Vasily Pozdnyakov1, Soeren Keller2, Benjamin Klusemann1,2, Nikolai Kashaev2, and Jens Oberrath1 — 1Institute of Product and Process Innovation, Leuphana University Lüneburg, Germany — 2Helmholtz Centre Geesthacht, Institute of Materials Research, Materials Mechanics, Department of Joining and Assessment, Germany
Laser shock peening (LSP) is one of the industry applicable surface modification techniques to improve mechanical properties of the metals and alloys. It is a potential substitute of the conventional methods, e.g. shot peening. LSP deals with laser pulses with high intensity (> 1 GW/cm2) and short duration (ns-range). The promising method of the process prediction and optimization is a simulation, due to the great development of the computational techniques, low operational costs and good flexibility. It allows predicting the plasma and shock wave behavior, as well as residual stress (RS) distribution within the processing material.
In our research, a global model of Zhang et al. [1] is applied for macroscale LSP (mm-range). The plasma pressure temporal distributions are determined and used for the finite element simulation to predict the residual stress distribution within the material [2]. Predicted RS shows a good agreement with the experimental results.
[1] W. Zhang, Y.L. Yao, I.C. Noyan, J. Manuf. Sci. E. - T. ASME 126, 10 (2004)
[2] S. Keller, S. Chupakhin, P. Staron, E. Maawad, N. Kashaev, B. Klusemann, J. Mater. Process. Technol. 255, 294-307 (2018)