2D nonlocal versus 3D bifurcation studies for biaxially loaded plates

The main objective of this work is to analyst how a two-dimensional second gradient plasticity model is able to reproduce the three-dimensional bifurc ation behaviour for a biaxially loaded flat plate. While it is found that t he simple model used here is able to capture them qualitatively for the lon gwavelength regime, it fails in reproducing them quantitatively, and in the shortwavelength regime. Consideration of a more elaborated generalized con tinuum should probably overcome these difficulties.