Influence of the Testing Machine’s Stiffness on the Calibration Process of Ductile Failure Models

Petr Kubík, František Šebek, Jindřich Petruška, Jiří Hůlka


The paper deals with evaluation of the influence of
the stiffness of testing machine on the calibration of parameters
of ductile fracture models. The calibration is based on numerical
simulation of experiments, realized by the special notched tube
specimen. These are exposed to combined loading with different
proportions between axial and torsional loading components.
Input data for the computational simulation of experiments can
either be based on theoretical proportion between the axial
and torsional movement of the testing machine mechanism, or
taken directly from specimen displacements measured by digital
image correlation on the specimen’s surface. The results show the
difference in calibration parameters obtained by both methods.


machine’s stiffness, ARAMIS, loading ratio, ductile failure model, flow curve.


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ISSN 1801-1217 (Print)
ISSN 1805-9422 (Online)
Published by the Czech Technical University in Prague, Faculty of Mechanical Engineering