Proposal of sheet buckling design criteria for high strength steel under impact crushing

摘要

The purpose of this study is to verify the validity of sheet buckling design based on the effective width theory as an investigation of the impact crushing properties in high strength steel sheets. The need to make full cross-sections effectively without elastic buckling occurring is clarified and the application of the effective width theory under high speed deformation is considered. The findings of this investigation into the sheet buckling phenomenon are reported with numerical simulation by varying deformation strain rate, mechanical property of material and member configuration. The results demonstrate that the constant α used in the existing theory is function of strain rate ε and material yield stress σγ. With increasing crush speed, the cross section of a steel sheet becomes effective; the design based on the existing theory has provided enough evidence of safety. Furthermore, some criteria for limit buckling design are proposed.