Resumen de Influence of initial geometric imperfections and porosity on the stability of functionally graded material plates
In the present paper, the eect of initial geometric imperfections and porosity on the stability of functionally graded material (FGM) plates is investigated.
The formulations are based on the recently developed nonpolynomial higher order shear and normal deformation theory by the authors. The present theory accounts for a nonlinear variation of in-plane and transverse displacement across the thickness. Accountability of thickness stretching eect using only four unknowns makes it distinct from the existing renowned theories.
The generic imperfection function is used to model various possible initial geometrical imperfections such as sine-type, local-type, and global-type imperfections. An ecient C0 nite element is used for the model and the variational approach is utilized to derive the fundamental equations for the FGM plates. Extensive numerical studies have been conducted to bring out the inuence of geometric imperfection, porosity, geometric conguration, and volume fraction index on the stability of FGM plates
