![]() Further in the stress–strain relation for the weld metal is determined through experimental investigations of round tensile specimens. More conventional, notched cross weld tensile testing for determining true stress–strain curves for weldments was considered in, whereas a method for determining material’s equivalent stress–strain curve with any axisymmetric notched tensile specimens without Bridgman correction was considered in. It was concluded that the predicted strain distributions were in good agreement with the measured ones, thus demonstrating the validity of the proposed experimental method to accurately determine the true stress–strain values of the weldment. The same topic was considered in, but for different shape of welded joint, the so-called tailor-welded blank weldment. In the latter case the central idea was to force plastic deformation at a notch in the material zone of interest, and to obtain the true stress–strain curve of that material zone from the recorded load versus diameter reduction curve. In the first case, the relation between the total area reduction and the thickness reduction was derived, consisting of three parts-geometry function, material function, and basic necking curve. Tensile diagrams for welded joints have been determined in, using novel methods for determining true stress–strain curves for homogenous materials with rectangular cross-section and weldments with round cross-section. One should notice that homogeneous material with rectangular cross-section was analyzed in, where the tensile properties of FH550 and X80 steels were investigated using rectangular cross-section specimens with different thicknesses, respectively. Results indicated that new methodology is a general one, since it is not dependent on welded joint material and geometry. New methodology is then applied to determine actual stress–strain diagrams for two undermatched welded joints with different rectangular cross-section and groove shapes, made of martensitic steels X10 CrMoVNb 9-1 and Armox 500T. ![]() ![]() The essence of new methodology is to introduce stress concentration factor into the procedure of actual stress evaluation. Next step was to estimate the stress concentration by using a new methodology, based on recently introduced analytical expressions and numerical verification by the finite element method (FEM), to obtain actual stress–strain diagrams, as named in this paper. The first step was to use the 3D digital image correlation (DIC) to estimate true stress–strain diagram by replacing common analytical expression for contraction with measured values. This paper presents new methodology for determining the actual stress–strain diagram based on analytical equations, in combination with numerical and experimental data. ![]()
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