Numerical Study inAxial Impact of Thin-walled Circular Tubes Made of High Strength Steel

摘要

This work uses the non-linear finite element software LS-DYNArnto analyze the axial compression behavior and energy absorption of arnhigh-strength thin-walled member under an impact load. The stressstrainrncurve of high-strength steel is determined by performing staticrnuniaxial tensile tests. To elucidate the effect of dynamic impact on thernstrain rate, the Cowper-Symonds equation is adopted during the plasticrnstage to calculate the dynamic yield strength under various strain rates,rnsuch that the modeled deformation behavior of the member isrnconsistent with the actual situation. This work initially compares thinwalledrnmembers made of mild steel and dual phase steel. Under therncondition that the components are made of different materials but havernequal sectional areas, an analysis confirms that the high-strength steelrnthin-walled component outperforms the mild steel thin-walledrncomponent. Accordingly, thin-walled tubes made of high-strength steelrnare studied using a series of tests.