Experimental Study on the QuasiStatic Axial Crush Response of High Strength Steel ClosedHat Structures

Abstract

Abstract: In order to study the influence of forming history on the crash behavior of auto-body component, axial crush behavior and energy-absorption performance were compared on the spot-welded closed-hat structures fabricated with different forming conditions for two high strength steels, HSLA340 and DP590 respectively. It was proved that the local material strengthening and geometry weakening resulted from the stamping process significantly affect the post-buckling mode of the hat structures subject to axial loading condition. As a result, the energy absorption of stamped components is lower than that of bent component. In addition, the sheet metal tearing is observed on the crushed components formed under high blank-holder-force stamping condition, which is believed to be dependent on both the strain history and stress state. Due to the special character of low yield/ultimate strength ratio of DP590, the energyabsorption performance of DP590 components is always superior to that of HSLA340 components.

Key words: high strength steel, forming condition, axial crush, energy-absorption performance

CLC Number:

TG113.25

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