Boundary condition effect on the evaluation of stress triaxiality fields

Andrija Zaplatić (1, 2) , Ana Vrgoč (1, 2) , Zvonimir Tomičević (1) , François Hild (2)

1 University of Zagreb
2 LMPS - Laboratoire de Mécanique Paris-Saclay

A general framework is presented for evaluating stress triaxiality fields using five different configurations of Dirichlet boundary conditions. The latter ones were measured via stereocorrelation for a simple shear test on a thin sample where buckling was mitigated with an anti-buckling fixture. Friction and material parameters displayed negligible influence on the stress triaxiality fields. Accounting for the anti-buckling fixtures provided the most realistic stress triaxiality fields, but was computationally demanding. Prescribing all out-of-plane displacements, noisier but trustworthy stress triaxiality fields were also obtained by using much less computational resources.

Mots clés: Buckling; Dirichlet boundary conditions; inverse problem; simple shear; stereocorrelation

Domaines: Mécanique des matériaux [physics.class-ph]

Andrija Zaplatić, Ana Vrgoč, Zvonimir Tomičević, François Hild. Boundary condition effect on the evaluation of stress triaxiality fields. International Journal of Mechanical Sciences, 2023, 246, pp.108127. ⟨10.1016/j.ijmecsci.2023.108127⟩. ⟨hal-03950471⟩