Stress intensity factors from stress analysis of an equivalent hole

In order to validate the method, two experimental cases have been considered: a plate with two different bore diameters of 50% and 20% of the plate width, respectively. The stress analysis was performed by means of strain gauges attached to the free border. For the plate with the smaller bore, the strain gauges were also attached to the surface near the hole. In this way, the strain approach can be extended to thin plates or when it is not possible to attach the strain gauges to the free border of the hole.