Simple estimation method for stress field near a notch in real structures with strain gages (1st Report, A plate under arbitrary in-plane loading)

In this paper, the authors propose a simple method for estimating the stress field near a notch in a plate under in-plane loading with strain gages. In this method, the stress field near a notch in practical and complicated structures can be estimated easily by determining the unknown coefficients of stress field expressions in a plate containing a free circular hole that is inscribed in the notch root. For this purpose, experimentally, it is necessary to measure only strain values at four points on a circular arc whose radius is 1.5 times the notch root radius using rosette-type strain gages. And the unknown coefficients are determined from these strain values with the method of least squares. We have demonstrated this method using eight types of the notched plates that differ in shape. Consequently, estimation errors were significant in a few cases that the shapes of the notched plates are extreme. However, we obtained estimation results accurate enough for practically except the cases above mentioned.