ժҪ The deformation behavior of the dual phase steel (DP1000 steel) was studied by the quasi-static tensile experiment and the dynamic tensile experiment. The experiments were carried out at strain rates ranging from 10-4 to 2000 s-1 at room temperature. Then the stress-strain curves of DP1000 steel in the strain rate range of 10-4-2000 s-1 were measured. By introducing the strain rate sensitivity factor m, Zerilli-Armstrong model was optimized. The constitutive equation parameters which formulate the mechanical behavior of DP1000 steel were fitted based on the Johnson-Cook (JC) constitutive model and the optimized Zerilli-Armstrong (ZA) constitutive model, respectively. By comparing indicators of ��accuracy-of-fit��, R2 terms, for the two models, the optimized Zerilli-Armstrong constitutive model can reflect plastic deformation behavior both at the low and high strain rates more accurately. The reasons why the optimized Zerilli-Armstrong constitutive model is more advantageous than the Johnson-Cook model were discussed by using the yield strength and ultimate tensile strength (UTS) versus strain rates, and strain hardening rate versus effective plastic strain analytical methods.
Abstract��The deformation behavior of the dual phase steel (DP1000 steel) was studied by the quasi-static tensile experiment and the dynamic tensile experiment. The experiments were carried out at strain rates ranging from 10-4 to 2000 s-1 at room temperature. Then the stress-strain curves of DP1000 steel in the strain rate range of 10-4-2000 s-1 were measured. By introducing the strain rate sensitivity factor m, Zerilli-Armstrong model was optimized. The constitutive equation parameters which formulate the mechanical behavior of DP1000 steel were fitted based on the Johnson-Cook (JC) constitutive model and the optimized Zerilli-Armstrong (ZA) constitutive model, respectively. By comparing indicators of ��accuracy-of-fit��, R2 terms, for the two models, the optimized Zerilli-Armstrong constitutive model can reflect plastic deformation behavior both at the low and high strain rates more accurately. The reasons why the optimized Zerilli-Armstrong constitutive model is more advantageous than the Johnson-Cook model were discussed by using the yield strength and ultimate tensile strength (UTS) versus strain rates, and strain hardening rate versus effective plastic strain analytical methods.
SONG Ren-bo,DAI Qi-feng. Dynamic Deformation Behavior of Dual Phase Ferritic-Martensitic Steel at Strain Rates From 10-4 to 2000 s-1[J]. �й������ڿ���, 2013, 20(8): 48-53.
SONG Ren-bo,DAI Qi-feng. Dynamic Deformation Behavior of Dual Phase Ferritic-Martensitic Steel at Strain Rates From 10-4 to 2000 s-1. Chinese Journal of Iron and Steel, 2013, 20(8): 48-53.
2013, Vol. 20 
