Determination of stress intensity factors for multi-material junctions

Abstract

This study evaluates the junction-tip coordinates and the stress intensity factors (SIFs) of multi-material junctions using the image-correlation experiment and least-squares method. The major advantage of the proposed method is that the procedure is simple and systematic. First, complex displacement functions are deduced into a least-squares form, and then displacement fields from the image-correlation experiment are substituted into the least-squares equation to evaluate the SIFs. Compared with the SIFs from H-integrals using finite element results, the calculated least-squares SIFs are accurate if more than 10 eigenvalues are included. Furthermore, the leastsquares SIFs are not sensitive to the maximum or minimum radius of the area from which data is included.

Determination of high‐order fields for multianisotropic material antiplane V‐notches and inclusions by the asymptotic expansion technique and an overdeterministic method

“…Junction and inclusion are other examples of multimaterial wedge. Ju et al evaluated the junction‐tip coordinates and the stress intensity factors of multimaterial junctions using the image‐correlation experiment and least‐squares method. Barroso et al and Vicentini et al presented a procedure for determining the generalized fracture toughness in multimaterial closed corners with two stress singularities.…”