Abstract
Abstract A biaxial tensile test has been designed for the experimental determination of yield locus points of thin steel sheets. Using texture-based anisotropic finite-element (FE) simulations, the geometry of the test sample has been optimised and the accuracy of the conversion procedure has been validated. It was found that the present technique has a high precision for principal stress ratios σ y / σ x between tan(20°) and tan(70°). Experimental tests have been carried out on five steel qualities (low and ultra-low carbon) with thickness between 0.8 and 1.5 mm. Both yield stresses and ratios of plastic strains have been compared to the theoretical predictions obtained with the Taylor–Bishop–Hill (TBH) model using the experimentally determined crystallographic textures. The {110}〈111〉 and {112}〈111〉 slip systems were considered using both full-constraints (FC) and relaxed-constraints (RC) assumptions for the TBH model. These comparisons are clearly in favour of the TBH-FC model.
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