한국압력기기공학회 논문집 (Transactions of the Korean Society of Pressure Vessels and Piping)

한국압력기기공학회 (Korean Society of Pressure Vessels and Piping)
권호 표지
DOI QR코드

DOI QR Code

초음파나노표면개질 다중충격 조건에서의 잔류응력 예측을 위한 유한요소 피닝해석 영역 결정

Determination of Peening Area for Finite Element Residual Stress Analysis of Ultrasonic Nanocrystal Surface Modification under Multiple Impact Conditions

  • 석태현 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 박승현 (성균관대학교 기계공학부) ;
  • 허남수 (서울과학기술대학교 기계시스템디자인공학과)
  • 투고 : 2021.12.01
  • 심사 : 2021.12.20
  • 발행 : 2021.12.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Ultrasonic Nanocrystal Surface Modification (UNSM) is a peening technology that generates elastic-plastic deformation on the material surface to which a static load of a air compressor and a dynamic load of ultrasonic vibration energy are applied by striking the material surface with a strike pin. In the UNSM-treated material, the structure of the surface layer is modified into a nano-crystal structure and compressive residual stress occurs. When UNSM is applied to welds in a reactor coolant system where PWSCC can occur, it has the effect of relieving tensile residual stress in the weld and thus suppressing crack initiation and propagation. In order to quantitatively evaluate the compressive residual stress generated by UNSM, many finite element studies have been conducted. In existing studies, single-path UNSM or UNSM in a limited area has been simulated due to excessive computing time and analysis convergence problems. However, it is difficult to accurately calculate the compressive residual stress generated by the actual UNSM under these limited conditions. Therefore, in this study, a minimum finite element peening analysis area that can reliably calculate the compressive residual stress is proposed. To confirm the validity of the proposed analysis area, the compressive residual stress obtained from the experiment are compared with finite element analysis results.

키워드

과제정보

이 논문은 2020년도 정부(산업통상자원부)의 재원으로 한국에너지기술평가원의 지원을 받아 수행된 연구임.(20206500000010, 원전 1등급 기기 결함 예방용 표면응력개선 시스템 개발 및 실증)

참고문헌

  1. Kim, J. S., 2011, "Investigation of the Preventative Maintenance Schemes for the Dissimilar Metal Welds of Components in Nuclear Reactor Coolant System," J. Weld Joi, Vol. 29, No. 2, pp. 147-154. doi:10.5781/KWJS.2011.29.2.013 
  2. John, H. J., Denise, P. and Michael, W., 2017, "Topical Report for Primary Water Stress Corrosion Cracking Mitigation by Surface Stress Improvement," Electric Power Research Institute, Palo Alto, CA, MRP-267 
  3. ASME BPVC Sec.XI, Code Case N-729-6, 2017, "Alternative Examination Requirements for PWR Reactor Vessel Upper Heads with Nozzles having Pressure-Retaining Partial-Penetration Welds," American Society of Mechanical Engineers, NY. 
  4. Maxwell, M., 2013, "An Integrated Experimental and Simulation Study on Ultrasonic Nano-Crystal Surface Modification," University of Cincinnati, Engineering and Applied Science: Mechanical Engineering, Master's Thesis. 
  5. Wu, B., Khang, L., Khang, J., Murakami, R. and Pyoun, Y. S., 2015, "An Investigation of Ultrasonic Nanocrystal Surface Modification Machining Process by Numerical Simulation," Adv. Eng. Softw, Vol. 83, pp. 59-69. doi: https://doi.org/10.1016/j.advengsoft.2015.01.011 
  6. Park, H. U., Kim, J. H., Pyun, Y. S., Amanov, A. and Choi, Y. S., 2019, "Numerical and Experimental Studies on Subscale Behaviors of Ultrasonic Surface Peening," Met. Mater. Int, 25, pp. 606-616. doi:https://doi.org/10.1007/s12540-018-00234-7 
  7. Khan, M. K., Fitzpatrick, M. E., Wang, Q. Y., Pyoun, Y. S. and Amanov, A., 2017, "Effect of Ultrasonic Nanocrystal Surface Modification on Residual Stress and Fatigue Cracking in Engineering Alloys," Fatigue. Fract. Eng. M, Vol. 41, No. 4, pp. 844-855. doi:https://doi.org/10.1111/ffe.12732 
  8. Amrinder, G., Abhishek, T., Mannava, S. R., Dong, Q., Pyoun, Y. S., Hitoshi, S. and Vasudevan, V. K., 2013, "Comparison of Mechanisms of Advanced Mechanical Surface Treatments in Nickel-based Superalloy," Mater. Sci. Eng. A, Vol. 576, pp. 346-355. doi:https://doi.org/10.1016/j.msea.2013.04.021 
  9. O'Hara, P., 1999, "Superfinishing and Shot Peening of Surfaces to Optimise Roughness and Stress," WIT. Trans. Eng. Sci, Vol. 25, pp. 321-330. 
  10. Reza, T., Saeid, A. and Mario. G., 2019, "Analytical Modeling of Ultrasonic Surface Burnishing Process: Evaluation of Residual Stress Field Distribution and Strip Deflection," Mater. Sci. Eng. A, Vol. 747. pp. 208-224. doi:https://doi.org/10.1016/j.msea.2019.01.007 
  11. Reza, T., Liu, Z. and Wang. B., 2020, "Analytical Modeling of Surface Generation in Ultrasonic Ball Burnishing including Effects of Indentation Pile-up/Sink-in and Chipping Fracture," Arch. Civ. Mech. Eng, Vol. 20, No. 144. doi:https://doi.org/10.1007/s43452-020-00146-7 
  12. Inconel alloy 718, Specialmetals, https://www.specialmetals.com 
  13. Madhav, S., 2008, "Finite Element Simulation of Laser Shock Peening Process," University of Cincinnati, Industrial and Nuclear Engineering: Mechanical Engineering, Master's Thesis. 
  14. Dassault Systemes Corp., 2016, "ABAQUS User's Manuals," Ver. 2016. 
  15. Bagherifard, S., Ghelichi, R. and Guagliano, M., 2014, "Mesh Sensitivity Assessment of Shot Peening Finite Element Simulation aimed at Surface Grain Refinement," Surf. Coat. Tech, Vol. 243, pp. 58-64. doi:10.1016/j.surfcoat.2012.04.002 
  16. Kim, J. S., Nam, H. S., Kim, Y. J. and Kim, J. H., 2017, "Numerical Study of Laser Shock Peening Effects on Alloy 600 Nozzles with Initial Residual Stresses," J. Press. Vess-T. ASME, Vol. 139, No. 4. doi:https://doi.org/10.1115/1.4035977