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Department of Economical Engineering, "Vasile Alecsandri" University of Bacau , Bacau , Romania
"Vasile Alecsandri" University of Bacau , Bacau , Romania
"Vasile Alecsandri" University of Bacau , Bacau , Romania
Department of Environmental Engineering and Mechanical Engineering, "Vasile Alecsandri" University of Bacau Romania
Stress triaxiality is considered an invariant of stress, defined as the ratio of hydrostatic stress (hydrostatic pressure by other authors) and the equivalent stress (usually calculated using von Mises criterion). If the values of the main three stresses have comparable sizes, stress triaxiality can be also calculated using the first invariant of the stress tensor. Despite that the stress triaxiality is an invariant, the authors have determined experimentally and analytically its variation with the force at the tensile test, but also with the radius of notches caused in the specimen. 2P armor steel being used in lightweight armor, these notches occur after shocks with foreign objects. Furthermore, the authors have revealed the stress triaxiality variation function of the test type. The tests were performed on tensile specimens loaded for tensile test, pure torsion test, 25% tensile - 75% torsion test, 50% tensile - 50% torsion test, 75% tensile - 25% torsion test. The mathematical model used was designed by Xue.
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