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Simulation of laser shock peening on X12Cr steel using an alternate computational mechanical threshold stress plasticity model

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Abstract

The ever-increasing relationship between energy consumption and economic growth continues to reinforce functional power generation infrastructure as the centerpiece of development. However, downtimes from in-service failure of power plant components, such as turbine blades, portend dire consequences in the form of huge financial and safety concerns. This challenge is now being progressively overcome through intensive research in the development of laser shock peening (LSP) models, which simulate the induction of compressive layers around and beneath the surface of the blades. This paper presents an alternate experimentally validated computational modelling approach of the LSP process, grounded on a physics-based plasticity model which describes a mechanical threshold for compressive residual stress induction irrespective of increasing laser shock intensities. This is a phenomenon which hitherto has previously been overlooked by many researches. The results of this work show considerable promise when compared to experimental results.

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Acknowledgements

The authors wish to acknowledge the financial and technical support of the National Research Foundation (NRF Grant Reference No: SFH170720255948), Eskom, the National Laser Centre, Centre for Scientific and Industrial Research, Pretoria, Tshwane University of Technology and the Department of Science and Technology, Republic of South Africa towards the success of this research. Opinions expressed and conclusions arrived at are those of the author(s) and are not necessarily to be attributed to the NRF.

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Authors and Affiliations

  1. Department of Mechanical and Mechatronics Engineering, Tshwane University of Technology, Pretoria, South Africa

    Festus Fameso & Dawood Desai

  2. Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria, South Africa

    Schalk Kok

  3. Eskom Holdings SOC Ltd, Johannesburg, South Africa

    Mark Newby

  4. CSIR National Laser Centre, Brummeria, Pretoria, South Africa

    Daniel Glaser

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  1. Festus Fameso
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  2. Dawood Desai
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Correspondence to Festus Fameso.

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Fameso, F., Desai, D., Kok, S. et al. Simulation of laser shock peening on X12Cr steel using an alternate computational mechanical threshold stress plasticity model. Int J Adv Manuf Technol 111, 1–11 (2020). https://doi.org/10.1007/s00170-020-06079-y

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  • DOI: https://doi.org/10.1007/s00170-020-06079-y

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