Simulation of laser shock peening on X12Cr steel using an alternate computational mechanical threshold stress plasticity
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ORIGINAL ARTICLE
Simulation of laser shock peening on X12Cr steel using an alternate computational mechanical threshold stress plasticity model Festus Fameso 1
&
Dawood Desai 1 & Schalk Kok 2 & Mark Newby 3 & Daniel Glaser 4
Received: 19 February 2020 / Accepted: 11 September 2020 / Published online: 23 September 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
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. Keywords Compressive residual stresses, Laser shock peening, Mechanical threshold, Turbine blades
1 Introduction Energy generation is at the heart of contemporary global economic development, as well as future technological growth and prosperity projections. Current indices indicate continued reinforced heightening of the interrelationships between energy and economy; however, progressive increases in population, over and above, have gate crashed this loop. According to [1], between 15 and 20% increase in global population demographics is expected by the middle of the century, and with it rising demand for energy as a result of income, consumption and energy application trends. With the growing demand for digital connected devices and electrification of transport and heat, and air conditioning in response to
* Festus Fameso [email protected] 1
Department of Mechanical and Mechatronics Engineering, Tshwane University of Technology, Pretoria, South Africa
2
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria, South Africa
3
Eskom Holdings SOC Ltd, Johannesburg, South Africa
4
CSIR National Laser Centre, Brummeria, Pretoria, South Africa
environmental challenges, the nature of energy demand and consumption globally, requiring uninterrupted supply of energy to an increasingly fast-paced global economy has made provision of adequate quantum of energy to consumers become an increasingly primordial imperative for many governments at all levels. In the face of rising demand, yet with no proportional increase in hardware capacity, power generating companies ar
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