THE ACCURACY OF RESIDUAL-STRESS MEASUREMENT BY THE HOLE-DRILLING METHOD

This paper describes the verification of the accuracy of residual stre ss measurement by the hole-drilling method. The strain measurement is simulated by the use of the indirect fictitious-boundary integral meth od. As an example, a finite rectangular plate subjected to initial str ess is treated, and a simulated measurement of the residual stress is made using the strain relieved during hole drilling. The accuracy of r esidual stress measurement is estimated by comparing the simulated mea sured residual stress with the actual residual stress, i.e., the given initial stress. The results are shown for various distances and angle s of strain gages. Also, the influences of the eccentricity of the hol e from the center of the strain gages and the effect of a boundary nea r the hole are examined.