Incremental Hole-Drilling Method Vs. Thin Components: A Simple Correction Approach

Abstract:

The incremental hole-drilling method is a widely used technique to determine residual stress depth profiles in technical components. Its application is limited in respect to the components geometry, for instance the components thickness. In this paper, a direct correction of the measured strain relaxations is proposed to consider the impact of deviant geometries, here the component thickness, on the residual stress evaluation that moreover, allows the application of commercially available evaluation software. The herein proposed approach is based on finite element simulation of the incremental hole drilling. The simulated strain relaxations for thin metal sheets are evaluated with an algorithm as used in commercially available evaluation software (i) for uncorrected data as well as (ii) for strain data corrected by the proposed correction procedure. It is shown that the correction approach leads to a significant improvement of the measurement accuracy. Further, by means of the approach residual stress depth profiles in thin metal sheets can be as usual determined using commercial evaluation software for the incremental hole-drilling method regardless of the algorithm used, i.e. differential or integral.

• Periodical: Advanced Materials Research (Volume 996)
• Pages: 283-288
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.996.283
• Online since: August 2014
• Authors: Esther Held, Simone Schuster, Jens Gibmeier*
• Keywords: Components Thickness, Correction Function, Incremental Hole-Drilling Method, Neural Network (NN)

References

[1] ASTM E837-08, Standard Test Method for Determining Residual Stresses by Hole-Drilling Strain-Gage method.

DOI: 10.1520/e0837-13

[2] G. König, Ein Beitrag zur Weiterentwicklung teilzerstörender Eigenspannungsmeßverfahren, dissertation, University Stuttgart, (1991).

[3] E.G. Sobolevski, Residual Stress Analysis of components with Real Geometries Using the Incremental Hole-Drilling Technique and a Differential Evaluation Method, dissertation, University Kassel, (2007).

[4] T. Schwarz, H. Kockelmann, Die Bohrlochmethode - ein für viele Anwendungsbereiche optimales Verfahren zur experimentellen Ermittlung von Eigenspannungen, Messtech. Briefe, 29 (1993) 33–38.

[5] G. S. Schajer, Measurement of Non-uniform Residual Stresses Using the Hole-Drilling Method. Part II - Practical Application of the Integral Method, J. Eng. Mater. Technol., 110 (1988) 344–349.

DOI: 10.1115/1.3226060

[6] G. S. Schajer, Measurement of Non-uniform Residual Stresses Using the Hole-Drilling Method. Part I - Stress Calculation Procedures, J. Eng. Mater. Technol., 110 (1988) 338–343.

DOI: 10.1115/1.3226059

[7] Information on http: /www. mathworks. de/products/neural-network.

[8] E. Held, Eigenspannungsanalysen an Schichtverbunden mittels inkrementeller Bohrlochmethode, dissertation, University Karlsruhe, (2013).