A least-squares method to cancel rigid body displacements in a hole drilling and DSPI system for measuring residual stresses

• ANDRÉS E. DOLINKO; GUILLERMO H. KAUFMANN

OPTICS AND LASERS IN ENGINEERING

ELSEVIER

Lugar: Oxford; Año: 2006 vol. 44 p. 1336 - 1347

0143-8166

This paper presents the evaluation of a method to cancel rigid body displacements that can be introduced when a hole drilling and digital speckle pattern interferometry (DSPI) combined system is used to measure residual stresses. The proposed method is based on a least-square calculation of three correction parameters determined from two evaluation lines located near the edge of the phase map where the displacement field generated by the drilling process is supposed to be negligible. The errors introduced by the method for different residual stress levels and rigid body displacements are analysed using a numerical simulation. An application of the method to experimental data is also presented.