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The effect of material thickness on plastic buckling behavior of thin-walled polygonal shell members was studied by numerical analysis. Moreover, the interaction between the thickness and the cross sectional shape on plastic buckling behavior of the members were clarified to establish a novel design scheme for the energy absorbing members of automobiles. FEM results showed that plastic buckling behavior was influenced by the interaction between the thickness and the width of planar regions of cross section, where the buckling load became larger as the thickness ratio of plane region decreased. On the other hand, the interaction between the thickness and the sectional area of ridgeline affected the stability of plastic buckling behavior, where the load became smaller in the case of the cross sectional area of ridgeline was not large enough. A novel design scheme controlling the plastic buckling behavior of thin-walled polygonal shell members was established to ensure high impact energy absorption on the basis of the above outcome. In addition, the validity of the design scheme was demonstrated through a practical design example of automobile parts.

Effect of Material Thickness on Plastic Buckling Behavior of Thin-Walled Polygonal Shell Members