Transactions of the Korean Society of Machine Tool Engineers (한국공작기계학회논문집)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
권호 표지

A Study on the Effects of Feedrate and Shotpeening on the Fatigue Life of A17075-T6 Specimens

A17075-T6 시편의 절삭이송속도와 쇼트피닝 유무에 따른 피로수명 연구

  • 김형태 (서울산업대 에너지환경전문대학원) ;
  • 신기훈 (서울산업대 기계공학과)
  • Published : 2007.08.15
Download PDF
⟨ Previous Next ⟩

Abstract

This paper presents a study on the effects of feedrate and shotpeening on the fatigue life of A17075-T6 specimens. For this purpose, six groups of specimens, each of which consists of eight specimens, were first machined at six different feedrates(0.05, 0.10, 0.15, 0.20, 0.25, 0.30mm/rev). Half of eight specimens in each group were then peened and the others remained un-peened. Then, the fatigue life was measured by using 4-point rotatry bending machine. One observation was that the fast the feedrate was, the large the diameter of a specimen was. To make sure that the bending stress was the same in all cases, different loading conditions were thus applied to specimens based on their diameters. Next, comparison of fatigue life among twelve sets of specimens(six groups times two sets, peened and un-peened) was performed. Finally, based on machining cost analysis, a guideline for optimal feedrate was presented.

Keywords

References

  1. Kang, S. J. and Kim, J. K., 2004, 'Characteristics Evaluation of Surface Roughness with Ultra Precision Maching,' Trans. of KSMTE, Vol. 13, No. 1, pp. 9-15
  2. Choi, J. B. and Choi, H. O., 1998, 'A Study on the Fatigue Life Prediction of Al 7075-T6 alloy,' Trans. of the KSME, A, pp. 230-235
  3. Kim, T. H., Cheong, S. K. and Shin, Y. S., 2002, 'A Study on the Fatigue Characteristics of Al 7075-T6 by Shot Peening,' Trans. of the KSMTE, pp. 335-340
  4. Nam, J. H., Kim, T. H. and Cheong, S. K., 2002, 'High Temperature Fatigue Characterisitics of Al 7075-T6 by Shot Peening,' Industry of technology symposium, pp. 424-428
  5. Jun, J. U., Chung, J. S., Shin, K. D., Koo, Y. and Ha, M. K., 2000, 'Study of Surface Roughness by Cutting Angle at Turning of Non-iron Metal,' Trans. of KSMTE, pp. 236-241
  6. Kim, S. I. and Cho, J. W., 2005, 'Cutting Power Based Feedrate Optimization for High-Efficient Machin ing,' Trans. of KSME, Vol. 29A, No. 2, pp. 333-340
  7. Cheong, S. K. and Lee, S. H., 2001, The theory of shotpeening processing, Sehwa company
  8. Cheong, N. Y., Lee, G. S., Kim, J. K. and Han, M. G., 2004, Material test, Wonkwang, pp. 249-255
  9. Gorczyca, 1987, Application of Metal Cutting Theory, Industrial Press, New York
  10. Degarno, E. P., Balck, J. T. and Kohser R. A., 2003, Materials and Process in Manufacturing, John Wiley & Suns