360-deg full-field measurement of steel specimens under combined tension/torsion loads
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In this work we present a system to perform full-field measurement over the 360 degrees surface of a round specimen during combined tension-torsion tests. Measurements are performed by a camera mounted on a slewing ring bearing that allows to cover the whole surface of the specimen. First,a set of calibration tests is performed to evaluate the metrological performances of the equipment. Afterwards, the system is used to track the deformation of steel specimens under severe plastic deformation until final fracture. Experimental results are compared with those obtained from numerical models of the test,calibrated by a global FEMU approach,in order to assess the feasibility of employing the proposed technique formaterial characterization.