GMNIAGeometrically and Materially Nonlinear Analysis with Imperfections (structural analysis)
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Using GMNIA the introduction of initial deflections is necessary.
The stress-strain relationship of the material was received from the whole tube tension tests and the average values introduced as multilinear isotropic material into ANSYS analysis (GMNIA) according to Figure 8.
Stress-strain relationship for austenitic steel 1.4301 (left), results of GNIA and GMNIA (right)