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Modeling of a Confinement Effect in Laser Shock Peening on Titanium Alloy

티타늄 합금에 대한 레이저 쇼크 피닝에서 컨파인먼트에 따른 피닝 효과 모델링

  • Lee, Wooram (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Kim, Joohan (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology)
  • Received : 2013.05.20
  • Accepted : 2013.07.13
  • Published : 2013.08.15

Abstract

In this study, the effect of laser shock peening on a titanium alloy was modeled using different confinements. Both liquid and solid confinement could be applied to laser shock peening, and solid confinement provided a dry laser shock peening process, which has the advantage of a corrosion-free effect. When a different confinement was applied to laser shock peening, a different peening effect would be expected. In our study, the peening effect was numerically modeled and simulated. The main effect of different confinements was a change in the impedances required to confine a shock wave from a plasma. The impedances were assumed with respect to different materials. Johnson-Cook's plastic deformation modeling was applied to the simulation. The strains and residual stresses were calculated to evaluate the confinement effects. When solid confinement was used, the residual stress increased by 60-85%, compared to the case of liquid confinement. However, the depth of the residual stress was slightly deeper. The simulated results could be applied to estimate the peening effect when a different confinement was used in the laser shock peening process.

Acknowledgement

Supported by : 서울과학기술대학교

References

  1. Lee, K.R., Yang, Y. S.,Hwang, C. Y., Yoo, Y. T., 2012, Characteristics of Surface Hardening of Nd:YAG Laser According to Temperature Changes of SM45C, Journal of the Korean Society of Manufacturing Technology Engineers, 21:6 988-997. https://doi.org/10.7735/ksmte.2012.21.6.988
  2. Yang, S. Y., Choi, S. D., Jun, J. M., Gong, B. C., 2010, Improving the residual stress characteristics of the metal surface by Nd:YAG laser schok peening, Journal of the Korean Society of Manufacturing Technology Engineers, 19:4 539-547.
  3. Lavender, C. A., Hong, S. T., Smith, M. T., Johnson, R. T., Lahrman, D., 2008, The effect of laser shock peening on the life and failure mode of a cold pilger die, Journal of Materials Processing Technology, 204 486-491. https://doi.org/10.1016/j.jmatprotec.2008.02.002
  4. Sanchez-Santana, U., Rubio-Gonzalez, C., Gomez-Rosas, G., Ocana, J. L., Molpeceres, C., Porro, J., Morales, M., 2006, Wear and friction of 6061-T6 aluminum alloy treated by laser shock processing, Wear, 260:7-8 847-854. https://doi.org/10.1016/j.wear.2005.04.014
  5. Golden, P. J., Hutson, A., Sundaram, V., Arps, J. H., 2007, Effect of surface treatments on fretting fatigue of Ti-6Al-4V, International Journal of Fatigue, 29:7 1302-1310. https://doi.org/10.1016/j.ijfatigue.2006.10.005
  6. Hatamleh, O., Lyons, J., Forman, R., 2007, Laser and shot peening effects on fatigue crack growth in friction stir welded 7075-T7351 aluminum alloy joints, International Journal of Fatigue, 29:3 421-434. https://doi.org/10.1016/j.ijfatigue.2006.05.007
  7. Fabbro, R., Fournier, J., Ballard, P., Devaux, D., Virmont, J., 1990, Physical study of laser-produced plasma in confined geometry, Journal of Applied Physics, 68, 775-784. https://doi.org/10.1063/1.346783
  8. Fairand, B. P., Clauer, A. H., 1977, Use of laser generated shocks to improve the properties of metals and alloys, Industrial applications of high power laser technology, 86, 112-119.
  9. Fabbro, R., Peyre, P., Berthe, L., Scherpereel, X., 1998, Physics and applications of laser-shock processing, Journal of Laser Applications, 10, 265-279. https://doi.org/10.2351/1.521861
  10. Montross, C. S., Wei, T., Ye, L., Clark, G., Mai, Y. W., 2002, Laser shock processing and its effects on microstructure and properties of metal alloys: a review, International Journal of Fatigue, 24:10, 1021-1036. https://doi.org/10.1016/S0142-1123(02)00022-1
  11. Johnson, G. R., Cook, W. H., 1985, Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures, Engineering Fracture Mechanics, 21:1, 31-48. https://doi.org/10.1016/0013-7944(85)90052-9