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

被引：2

作者：

Lee, H. T. ^{[1
]}

Liu, C. ^{[1
]}

Hsu, F. C. ^{[1
]}

Hsu, J. M. ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Mech Engn, Tainan 701, Taiwan

来源：

MATERIALS TRANSACTIONS | 2008年 / 49卷 / 08期

关键词：

electrical discharge machining; hole-drilling strain gage method; residual stress; transformation layer;

D O I：

10.2320/matertrans.MER2008098

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 it measurement error. Usually this error can be calibrated by estimating and reducing the hole-drilling induced extra stress, sigma(IS). However, the value of sigma(IS) is highly sensitive to the EDM parameters. Accordingly, the current study aimed at lowering sigma(IS) 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.

引用

页码：1905 / 1910

页数：6

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