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Materials Engineering Group

Research / Students / Burak Toparli


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Student Project

Analysis of Laser Shock Peen Residual Stress Field

Academic supervisors

Prof. Mike Fitzpatrick, Dr. Salih Gungor, Dr. Jim Moffatt

Burak Toparli
Burak Toparli

Background :

I am Muhammed Burak Toparli, one of the Turkish members of our department. I received my undergraduate degree with honour on Metallurgical and Materials Engineering from Middle East Technical University , Turkey in 2007. Before joining this nice team in February 2009, I was working for TUBITAK (The Scientific and Technological Research Council of Turkey) as EUREKA Project Officer in EU Framework Programmes, National Coordination Office.

PhD Project :

I am working on residual stress distribution of aluminium alloys formed by Laser Shock Peening in thin plates. In industry, there are surface treatment techniques applied in order to increase the service life of a component. The logic behind those methods is to form compressive residual stress near the surface area to retard crack initiation and propagation causing failure. Shot Peening is one of the most widely used techniques for this purpose. However, especially for critical applications such as those in aerospace industry, Laser Shock Peening found to be a good alternative since it creates similar amounts of compressive residual stress even deeper in the material with less surface roughness. However, especially for thin plates some more work has to be done especially for optimum process parameters. In this sense, I am investigating the effects of Laser Shock Peening parameters, such as laser power density and overlapping. For general information and nice introductory video about this surface treatment, you can visit the web pages prepared by Metal Improvement Company, one of the Laser Shock Peening service provider in North America and Europe .

To determine residual stress fields one needs destructive or non-destructive residual stress measurement techniques. I am using various kinds of techniques including Hole-Drilling, X-ray Diffraction and Neutron Diffraction. Besides these methods, I am concentrating on a much newer and promising technique, The Contour Method. For detailed information, you can visit the web pages of Mike Prime, the developer of this method.

Prof. Mike Fitzpatrick, Dr. Salih Gungor and Dr. Jim Moffat are my supervisors and we are working together in close collaboration with Airbus Deutschland on my project.



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