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In this paper, some of the displacement-based plate theories are used to investigate the elasticplastic analysis of plates in the framework of the ̄nite element method including the buckling and postbuckling e®ects with the focus on the general third-order plate theory (GTPT). The plate calculation results were compared with the results obtained using 64-nodes solid elements involving Lobatto integration scheme. The problem is solved using the Newton–Raphson method applying modi ̄ed Cris ̄eld constant arc-length procedure. The results show good agreement of results and the GTPT can be acknowledged to ful ̄ll essential criteria for application to the elastic-plastic analysis of thin and thick plates.

Elastic-Plastic Buckling and Postbuckling Finite Element Analysis of Plates Using Higher-Order Theory