Erlangen 2018 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 6: Poster

K 6.1: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Orangerie

Plasma shock wave simulation for laser shock processing — •Vasily Pozdnyakov and Jens Oberrath — Institute of Product and Process Innovation, Leuphana University Lüneburg, Germany

Improvement of mechanical properties such as fatigue life, corrosion, wear and erosion resistance of material surfaces has become an integral part of industrial operations. Laser shock peening (LSP) is one of the advanced surface modification techniques. When focusing a short (ns range) and intense (>1 GW/cm2) laser pulse onto a metallic target, surface layers instantaneously vaporize into a high temperature (about 10 000 K) and high pressure (> 1 GPa) plasma. This plasma induces a shock wave during expansion from the irradiated surface and a mechanical impulse transfers to the target resulting in plastic deformations and residual stresses appear.

In this work a 1D model, based on a global model of Zhang et al. [1, 2], is implemented in Python. As a result of its numerical solution the influence of laser parameters on the results of processing is investigated. Pressure distribution and plasma parameters are defined and compared both with experimental results and numerical models of other researchers.

[1] W. Zhang and Y.L. Yao, Proceedings of the ICALEO 2001

[2] W. Zhang, Y.L. Yao, I.C. Noyan, J. Manuf. Sci. E. - T. ASME 126, 10 (2004)