An enhanced calibration scheme for the EDM hole-drilling strain gage method for the measurement of residual stress in ferrous materials

H. T. Lee, C. Liu, F. C. Hsu, J. M. Hsu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Recent studies revealed that EDM hole-drilling strain gage method is applicable for the measurement of residual stress in materials with higher hardness and toughness. However, the metallurgical transformation layer formed on the wall of the hole induces an additional stress and therefore generates a measurement error. Usually this error can be calibrated by estimating and reducing the hole-drilling induced extra stress, errs. However, the value of σIS is highly sensitive to the EDM parameters. Accordingly, the current study aimed at lowering σIS by optimizing the working parameters of pulse current, pulse-on duration and pulse-off duration with experiments. An inverse power law relationship was constructed to predict the magnitude of the hole-drilling induced stress where was referred. A convenient calibration method was proposed where calibration factor can be easily determined. The calibrated results revealed good accuracy where deviation is no more than 10 MPa. The accuracy of the proposed calibration scheme was confirmed in study.

Original languageEnglish
Pages (from-to)1905-1910
Number of pages6
JournalMaterials Transactions
Volume49
Issue number8
DOIs
Publication statusPublished - 2008 Aug

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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