In-Plane Residual Stress Analysis Combining Hole-Drilling and Moiré Interferometry

  • J. N. Aoh
  • C. Y. Huang
  • J. Y. Lee
Conference paper

Abstract

Residual stress measurement combining hole-drilling method and moiré interferometry has been developed to improve accuracy of stress measurement and has opened a new area for novel stress measurement technique [1, 2]. Validation of the technique under uni-axial loading in a previous work [3] has established the relationship between moiré patterns and the associated stress magnitude. Based on this preliminary work, a biaxial loading frame shown in Fig. 1 was developed to apply a biaxial state of loading on the test specimen, on which both the hole-drilling and moiré interferometry were then conducted. A four-beam interferometry optics and a hole-drilling set-up were integrated with the biaxial loading frame into a system, shown in Fig. 2 with which a known biaxial stress state can be applied to the specimen. The corresponding fringe patterns obtained from the moiré interferometry after hole-drilling were obtained to correlate with the corresponding stress state. This provides a quantitative data base for the relationship between in-plane residual stress and the moiré fringe pattern. Specimen grating with a frequency of 1200 lines/mm was applied to specimens made of 6061-T6 aluminum alloy (3mm x 50mm x 50mm). The milling guide was moved on a motorized precision stage at the speed of 1.25m/sec. The successive drilled hole depths were 0.3 to 1.2mm with 1.6mm in diameter.

References

  1. 1.
    Z. Wu, J. Lu, B. Han, J.Appl. Mech. Trans ASME, vol. 119, 1, 1997, pp. 837–843Google Scholar
  2. 2.
    Z. Wu, J. Lu, B. Han, J.Appl. Mech. Trans ASME, vol. 119, 1, 1997, pp. 844–850Google Scholar
  3. 3.
    J.N. Aoh, H.M. Chen, Y.S. Chen, In Proceedings of ICEM12-12 th International Conference on Experimental Mechanics, 29August-2 Septmber,2004 Politecnico di Bari, Italy Google Scholar

Copyright information

© Springer 2007

Authors and Affiliations

  • J. N. Aoh
    • 1
  • C. Y. Huang
    • 1
  • J. Y. Lee
    • 1
  1. 1.Department of Mechanical EngineeringNational Chung Cheng University MinhsiungTaiwan, R.O.C.

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