Hole drilling (HDM) is the most widespread method for measuring the residuai stress profìle. HDM is based on the principle that a hole in the materiai causes stress relaxation; stress fìeld around the hole changes so that the released strain can be measured in order to calculate initial residual stress. Recently, the use of optical methods, as measurement tool for the strain fìeld generated around the drilled hole, has been investigated in place of the traditional strain gauge rosette technique. Optical methods have the advantage that guarantees very high sensitivity, provides much more significant statistics, eliminates error due to hole eccentricity, and reduces the cost in a single test. The accuracy of the fìnal results depends, among other factors, on the proper choice of the area of analysis. Defonnations detected by ESPI are in fact analysed within an annulus determined by two parameters, that is to say, the internal and the external radius. The choice of these parameters affects the fìnal results in terms of measured residual stress. Results of this analysis are the object of this paper.

Residual Stress Measurement by Electronic Speckle Pattern Interferometry: A study of the influence of geometrical parameters

BARILE, Claudia;CASAVOLA, Caterina;PAPPALETTERA, Giovanni;PAPPALETTERE, Carmine
2011

Abstract

Hole drilling (HDM) is the most widespread method for measuring the residuai stress profìle. HDM is based on the principle that a hole in the materiai causes stress relaxation; stress fìeld around the hole changes so that the released strain can be measured in order to calculate initial residual stress. Recently, the use of optical methods, as measurement tool for the strain fìeld generated around the drilled hole, has been investigated in place of the traditional strain gauge rosette technique. Optical methods have the advantage that guarantees very high sensitivity, provides much more significant statistics, eliminates error due to hole eccentricity, and reduces the cost in a single test. The accuracy of the fìnal results depends, among other factors, on the proper choice of the area of analysis. Defonnations detected by ESPI are in fact analysed within an annulus determined by two parameters, that is to say, the internal and the external radius. The choice of these parameters affects the fìnal results in terms of measured residual stress. Results of this analysis are the object of this paper.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/21195
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