Residual Stress Measurement by the Hole-Drilling Strain-Gage Method: Influence of Hole Eccentricity |
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| Paul Barsanescu, Petru Carlescu |
- Abstract:
- The accuracy of the hole-drilling strain-gage technique, the most widely used method for residual stress measurement, is directly related to: 1) the eccentricity between the hole center and rosette center, respectively, and 2) the accuracy of corrections for integration tendency of the strain gages. Although the drilling tool is optically aligned, the eccentricity always can not be zero and it is a source of error, affecting the accuracy of this technique. An equation for correction of the data affected by hole eccentricity has been proposed by A. Ajovalasit, but it is not precise enough, because it is founded on the wrong hypothesis that in the strain gage area there is a uni-axial state of stress, instead bi-axial one. The paper presents a new equation for data correction, which take account of the plane (bi-axial) state of stress in the strain gages area. After the hole-drilling and data acquisition, the hole eccentricity will be measured, using an optical microscope. Knowing the eccentricity, the data will be corrected using the proposed equation. This equation is more precise, because it is founded on a realistic hypothesis (bi-axial state of stress in the strain gages area).
- Download:
- IMEKO-TC4-2007-132.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- TC4 Symposium 2007
- Title:
- XVth IMEKO TC4 International Symposium on Novelties in Electrical Measurements and Instrumentation (together with 12th IMEKO TC4 Workshop on ADC Modelling and Testing)
- Place:
- Iasi, ROMANIA
- Time:
- 19 September 2007 - 21 September 2007