The present work investigates the elasto-visco-plastic buckling of thick plate structures. Methods to estimate the buckling of thin elasto-visco-plastic shells and plates are proposed in literature. To the knowledge of the authors, only few works present experimental results, and none treat the experimental elasto-visco-plastic buckling of thick plate. Thick rectangular plates are chosen as a structure of interest to study elasto-visco-plastic buckling. A modelling/experimental approach is followed to solve such problem. Buckling experiments at room temperature on thick elasto-visco-plastic plates subjected to compressive load are performed. 3D digital image correlation (3D-DIC) is used to measure displacement fields on plate surface during buckling experiments. The experiments are also modelled through a finite element model. Bodner’s approach is coupled to Hencky’s deformation theory to predict buckling of elasto-visco-plastic plates. Bifurcation analysis are performed to estimate buckling critical stresses and strains, and buckling modes. Geometrical and loading imperfections are also discussed. A good correlation is observed between numerical results and experiments. The limitation of Bodner’s approach is also discussed.

目前的工作研究了厚板结构的弹-粘-塑性屈曲。文献中提出了估计薄弹-粘-塑性壳和板屈曲的方法。据作者所知，只有少数作品展示了实验结果，并且没有一个作品涉及厚板的实验弹粘塑性屈曲。厚矩形板被选为感兴趣的结构来研究弹-粘-塑性屈曲。遵循建模/实验方法来解决此类问题。在室温下对承受压缩载荷的厚弹-粘-塑料板进行屈曲实验。3D 数字图像相关 (3D-DIC) 用于在屈曲实验期间测量板表面的位移场。实验也通过有限元模型进行建模。Bodner的方法与Hencky的变形理论相结合，以预测弹-粘-塑性板的屈曲。执行分岔分析以估计屈曲临界应力和应变以及屈曲模式。还讨论了几何和负载缺陷。在数值结果和实验之间观察到良好的相关性。还讨论了Bodner方法的局限性。