Discussions on "On the NURBS-based isogeometric analysis for couple stress-based nonlinear instability of PFGM microplates" [Mech. Based Des. Struct. DOI:10.1080/15397734.2020.1853567].

In this communication, it is mathematically proved that the modified couple stress theory-based stability trend (buckling-post-buckling) of the size-dependent porous functionally graded (metal-ceramic) shear deformable microplates with fully simply supported edges was wrongly predicted in the aforementioned paper. [ABSTRACT FROM AUTHOR]