TY - JOUR
T1 - An enhanced calibration scheme for the EDM hole-drilling strain gage method for the measurement of residual stress in ferrous materials
AU - Lee, H. T.
AU - Liu, C.
AU - Hsu, F. C.
AU - Hsu, J. M.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/8
Y1 - 2008/8
N2 - 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.
AB - 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.
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U2 - 10.2320/matertrans.MER2008098
DO - 10.2320/matertrans.MER2008098
M3 - Article
AN - SCOPUS:52449094139
SN - 1345-9678
VL - 49
SP - 1905
EP - 1910
JO - Materials Transactions
JF - Materials Transactions
IS - 8
ER -