Browse > Article
http://dx.doi.org/10.3795/KSME-A.2012.36.6.599

A Numerical Analysis on Application of Laser Peening to Dissimilar Metal Welds in a Safety Injection Nozzle of Integral Reactor  

Seo, Joong-Hyun (Dept. of Mechanical Engineering, Sunchon Nat'l Univ.)
Kim, Jong-Sung (Dept. of Mechanical Engineering, Sunchon Nat'l Univ.)
Jhung, Myung-Jo (Korea Institute of Nuclear Safety)
Ryu, Yong-Ho (Korea Institute of Nuclear Safety)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.36, no.6, 2012 , pp. 599-608 More about this Journal
Abstract
A numerical analysis has been performed through implicit dynamic finite element analysis using the commercial package, ABAQUS in order to investigate effect of laser peening on welding residual stress mitigation of dissimilar metal welds in a safety injection nozzle of integral reactor. The implicit dynamic finite element analysis are compared with the previous experimental results. By comparison, it is identified that the implicit dynamic finite element analysis is valid for residual stress mitigation via laser peening. Implicit static finite element residual stress analysis has been performed for the dissimilar metal welds subject to inner repair welding. The analysis results represent that both axial and hoop residual stresses are tensile on inner surface of safety injection nozzle due to inner repair welding. Also Parametric study has performed to investigate effect of laser peening variables such as maximum impact pressure, duration time of pressure, spot diameter and peening direction on the welding residual stress mitigation. As a result, it is found that laser peening has the preventive maintenance effect to mitigate mainly residual stresses of region near inner surface.
Keywords
Laser Peening; Welding Residual Stress; Dissimilar Metal Welds; Dynamic Finite Element Analysis;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Gilles, P. and Cipiere, M.F., 2006, "Residual Stress Influence on Dissimilar Material Weld Junction Fracture," Fracture of Nano and Engineering Materials and Structures, Proceedings of the 16th European Conference of Fracture, Alexandroupolis, Greece.
2 Anastasius, Y., 2006, Residual Stress and Its Effects on Fatigue and Fracture, Proceedings of a Special Symposium held within the 16th European Conference of Fracture - ECF16, Alexandroupolis, Greece, Springer.
3 Kim, J.S., Jin, T.E., Dong, P. and Prager, M., 2003, "Development of Residual Stress Analysis Procedure for Fitness-For-Service Assessment of Welded Structure," Transactions of KSME A, Vol.27, No.5, pp.713-723.   DOI
4 Kim, J.S. and Jin, T.E., 2007, "Development of Engineering Formulae for Welding Residual Stress Distributions of Dissimilar Welds on Nozzle in Nuclear Component," Proceedings of ASME 2007 PVP Conference, San Antonio, USA, PVP2007-26729.
5 Song, T.K., et al., 2009, "Assessment of Round Robin Analysis Results on Welding Residual Stress Prediction in a Nuclear Power Plant Nozzle," Transactions of KSME A, Vol.33, No.1, pp.72-81.   DOI
6 Nam, T.S., 2002, Finite Element Analysis of Residual Stress Field Induced by Laser Shock Peening, Dissertation Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of the Ohio State University.
7 DeWald, A.T., et al., 2004, "Assessment of Tensile Residual Stress Mitigation in Alloy 22 Welds due to Laser Peening," Journal of Engineering Materials and Technology, Vol.126, Issue 4, pp.465-473.   DOI   ScienceOn
8 Sano, Y., Obata, M. and Yamamoto, T., 2006, "Residual Stress Improvement of Weldment by Laser Peening," Welding International.
9 KINS, 2009, Development of Regulatory Assessment Technology for Small and Medium Power Reactors, KINS/HR-1050.
10 Gorman, J., Hunt, S., Riccardella, P. and White, G.A., 2008, Chapter 44. PWR Reactor Vessel Alloy 600 Issues, Companion Guide to the ASME Boiler & Pressure Vessel Code, Third Edition, Volume 1, ASME.
11 KEPRI, 2007, Development of Material Degradation Evaluation System for Major Nuclear Components, Final Report.
12 Wu, W.W. and Tsai, C.H., 1998, "Hot Cracking Susceptibility of Fillers 52 and 82 in Alloy 690 Welding," Metallurgical and Materials Transactions A, Volume 30, Number 2, pp. 417-426.
13 EU JRC Institute for Energy, 2004, Protocol for Finite Element Simulations of the NET Single-Bead-on-Plate Test Specimen.
14 Simulia, 2009, ABAQUS User's Manuals, Ver.6.8.
15 Ballard, P., 1991, Residual Stresses Induced by Rapid Impact - Applications of Laser Shoc- king, Doctorial Thesis, Ecole Polytechnique, France.
16 ASME B&PV Code Committee, 2001, ASME B&PV Code, Sec.II, Part D.
17 Lee, J., et al., 2007, "Mechanical Properties Evaluation in Inconel 82/182 Dissimilar Metal Welds," Proceedings of SMiRT19.
18 Battelle, 2002, Investigation of Weld Residual Stresses and Local Post-Weld Heat Treatment, Final PVRC JIP Report.
19 Huntington Alloys. Inc., 1980, CMTR.
20 Hans Nordberg, March 2004, Note on the Sensitivity of Stainless Steels tro Strain Rate, Avesta Polarit Research Foundation, Research Report, No 04-0-1.
21 Davies, R.G. and Magee, C.L., 1977, "The Effect of Strain Rate Upon the Bending Behavior of Materials," Trans. of ASME, J. of Engineering Materials and Technology, Vol. 99, pp.47-51.   DOI
22 Ding, K. and Ye, L., 2006, Laser Shock Peening Performance and Process Simulation, Woodhead Publishing Limited.
23 Singh, G., 2009, Effective Simulation and Optimization of Laser Peening Process, a Thesis of Doctor of Philosophy, Wright State University.
24 EPRI, 2004, Material Reliability Program: Welding Residual and Operating Stresses in PWR Alloy 182 Butt Welds, TR-1009378 (MRP-106).
25 EPRI, 2001, Material Reliability Program: Interim Alloy 600 Safety Assessments for US PWR Plants, Part 1: Alloy 82/182 Pipe Butt Welds, TR-1001491 (MRP-44).