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The effect of aspect ratio on the elastoplastic response of stiffened plates loaded in uniaxial edge compression

机译:长宽比对单轴边缘压缩中加筋板的弹塑性响应的影响

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A numerical study of the effect of aspect ratio on the buckling and collapse behaviour of flatbar-stiffened plates in compression is described. The plate equations are expressed in finite difference form and the solution is obtained using a dynamic relaxation algorithm. Initial imperfections and residual stresses are also introduced in the study. It was found that, for aspect ratios between 2 and 3.5, buckling occurs in the elastic regime, with the panels exhibiting significant post-buckling strength prior to collapse. For aspect ratios between 1 and 2 buckling occurs as the plastic zone increases, followed by rapid unloading as the panel collapses suddenly. The ultimate strength of the panel reduces with increasing aspect ratio, remaining practically constant at higher aspect ratios. The latter is attributed to the initial single half-wave distortion profile that prohibits the formation of the preferred buckling mode.
机译:描述了纵横比对压缩状态下扁钢加筋板屈曲和塌陷行为影响的数值研究。板方程以有限差分形式表示,并使用动态松弛算法获得解。研究中还引入了初始缺陷和残余应力。已发现,对于纵横比在2到3.5之间的材料,在弹性状态下会发生屈曲,并且面板在塌陷之前会表现出明显的屈曲后强度。对于介于1和2之间的长宽比,随着塑料区域的增加,会发生屈曲,然后随着面板的突然塌陷而迅速卸载。面板的极限强度随着长宽比的增加而降低,在高长宽比的情况下几乎保持恒定。后者归因于最初的单个半波失真曲线,该曲线阻止了首选屈曲模式的形成。

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