Ivetic, G. (2011), "Advances in laser shock peening theory and practice around the world: present solutions and future challenges", International Journal of Structural Integrity, Vol. 2 No. 1. https://doi.org/10.1108/ijsi.2011.43602aaa.002Download as .RIS
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Advances in laser shock peening theory and practice around the world: present solutions and future challenges
Article Type: Guest editorial From: International Journal of Structural Integrity, Volume 2, Issue 1
When presenting this special issue of International Journal of Structural Integrity entitled “Advances in laser shock peening theory and practice around the world: present solutions and future challenges”, dedicated to the 2nd International Conference on Laser Peening (Plate 1), the introduction for the conference, written by its Chairman, Dr Omar Hatamleh, seemed like a very appropriate citation to begin with, since the presented papers and keynote talks addressed indeed the problems stated:
Still a lot must be done on laser shock peening to allow it to become in time, a mature technology pervasive throughout industry. Looking to the future of laser shock peening, the goals remain: lowering processing cost, increase the understanding and the confidence of how to apply LSP, and to design the components taking into account the residual stresses induced by the process.
The second edition of the International Laser Peening Conference has been a great success in spite of an unfortunate coincidence that it has been held in the concomitance with the eruption of Eyjafjöll, an Icelandic volcano that has grounded most of the European air traffic. For this reason, some of our European colleagues were not able to participate to the conference and this event reminded us on the importance of the research we are pursuing, ensuring, among other things, the safety and structural integrity of aeronautical structures.
However, it is well known that the application of LSP technology has gone beyond aeronautical applications and many papers presented at this year’s conference were the testimony of this fact. Owing to our wish to include as many papers as possible, it was not possible to publish all of them in one single volume. Some papers are to be published in the subsequent issues of the journal and the choice which papers to include in the special issue was not an easy task. The intention was to include the papers that would cover topically and geographically the widest possible areas, giving an overview of the latest developments of the laser shock peening technology worldwide.
Comparison of LSP with other technologies is presented in work of Trdan Uroš, agar Sebastjan, Grum Janez and Ocanña José Luis in which corrosion resistance characteristics of LSP-treated surfaces are proved to be superior in respect to shot peening (SP)-treated surfaces. Ulrike C. Heckenberger, Elke Hombergsmeier, Vitus Holzinger and Wolfgang von Bestenbostel present a comparison of fatigue lives of LSP- and SP-treated bulk aluminium specimens, confirming the benefits of LSP over SP in increasing fatigue lives of treated components. The performance of LSP-treated components compared to the ones treated with SP is reported in the work of Dennis J. Buchanan, Michael J. Shepard and Reji John as well, where LSP-treated components have demonstrated less residual stress relaxation when compared to the shot peened ones.
In the work of Yuji Sano, Koichi Akita, Kazuya Takeda, Rie Sumiya, Toshiyuki Tazawa, Toshiyuki Saito and Chihiro Narazaki, the effect of cyclic loading on residual stress relaxation of LSP-treated components has been analysed, showing that major relaxation of compressive residual stresses occurs during the first loading cycle.
Advances in numerical modeling are reported in work of Miguel Morales, Carlos Correa, Juan Antonio Porro, Carlos Molpeceres and José Luis Ocaña where a numerical model that evaluates the thermal effects of LSP on the surface of the specimens without protective coating is presented. In the work of Kelly S. Carney, Omar Hatamleh, James Smith, Thomas Matrka, Amos Gilat, Michael Hill and Chanh Truong, a finite element analysis of LSP has been performed, applied to friction stir-welded joints. Thomas J. Spradlin, Ramana V. Grandhi and Kristina Langer present a FEM analysis used for fatigue life estimation of LSP-treated components, comparing it to experimental results.
Patrice Peyre, Neila Hfaiedh, Hongbin Song, Vincent Ji, Vincent Vignal, Wilfrid Seiler and Stephane Branly report the effects of using of two different laser sources on the resulting residual stress distributions and depth, contributing to better understanding of how to apply LSP in a more efficient manner, considering the given laser source.
Finally, a very interesting alternative application of LSP was the one described in the paper by S.R. Mannava, Sagar Bhamare, Vibhor Chaswal, Leonora Felon, David Kirschman, David Lahrman, Richard Tenaglia, Dong Qian, Vijay Vasudevan, relative to the use of LSP on spinal implants, from which can be seen that LSP can be used with success in bio-mechanical applications, as well.
Many thanks go to the authors whose conference papers are to be published in the subsequent issues of the journal, as well as everyone else who has participated and contributed to the 2nd International Laser Peening Conference. A great contribution to this special issue came from the scientific committee of the conference, which has played an important role during the selection and review of the invited papers.
The aim of this special issue was to attempt to provide state-of-the-art in the LSP research worldwide; however, many of the challenges still remain to be addressed and resolved in the future and the next steps taken towards better understanding of LSP technology and its applications will be presented at the 3rd International Conference on Laser Peening, to be held in Osaka, Japan, in October 2011.
Goran Ivetic Guest Editor