Abstract
The Displacement Match technique was successful in determining the stress intensity factors for the complex tensile-shear specimen subjected to a mixed mode of deformation. The effects of the different specimen dimensions were determined. While both the K I and K II values decreased with the increase of the sheet thickness and the specimen width, the nugget diameter had almost no effect on K I; however, K II increased with the increase of the nugget diameter. Among the studied specimen dimensions, the specimen free length was found to possess the least effect on the stress intensity factors. The parametric study has also demonstrated the inadequacy of the sheet cross-sectional area, the D t ratio and W D ratio as unique parameters influencing the K I and K II values; thus it is advisable to consider each of the sheet thickness, nugget diameter and specimen width individually as independent parameters. Radaj's structural stress formulae for the stress intensity factors of tensile-shear specimens were also compared to the finite element results obtained in this study; Radaj's formulae were found to be highly dependent on the location at which the stresses are being determined and produced lower K I values.
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