Three-Dimensional Stress Analysis by Three-dimensional Local Hybrid Method
In the displacement measurement inside a specimen by speckle photography, it is not easy to get clear Young's fringes images. Stress-intensity factors of mixed mode can be estimated by embedded speckle photography. However, the error of the stress intensity factor inside a specimen was considerably large. To evaluate the 3-D stress field inside the specimen from displacement data on the free surface obtained from the 2-D intelligent hybrid method, we developed the 3-D local hybrid method based on an inverse problem analysis. The accuracy of the 3-D local hybrid method varies depending on the depth of the plane of error assessment, hybrid domain size, and specimen thickness. Hence the optimal analysis conditions were discussed.
Ichsan Setya Putra and Djoko Suharto
K. Machida "Three-Dimensional Stress Analysis by Three-dimensional Local Hybrid Method", Key Engineering Materials, Vols. 306-308, pp. 523-528, 2006