Abstract
In this paper, uniaxial and biaxial tensile tests with cruciform specimens were conducted to investigate the deformation behaviour of dual phase steel sheet with a tensile strength of 590 MPa (DP590) under evaluated warm-forming temperatures (20–190 ∘ C). Detailed analyses were then carried out to obtain the corresponding experimental yield loci. For the purpose of describing the temperature-dependent yield behaviour of DP590 appropriately, the Yld2000–2d yield function with temperature-dependent exponent was proposed. The identification procedures of the introduced parameters were then proposed based on Levenberg-Marquardt optimization algorithm. Afterwards, the proposed model was implemented into ABAQUS as user subroutine VUMAT with NICE (Next Increment Corrects Error) explicit integration scheme. The numerical simulations of biaxial tensile tests were then conducted to confirm the validity of the proposed model. It could be concluded that the flexibility and accuracy of the proposed model guarantee the applicability in warm-forming applications.
Highlights
The application of the advanced high strength steel alloys (AHSS) has been increasing in the automobile industry for the weight reduction and collision-safe performance
This coupled thermal-mechanical behaviour of the dual phase (DP) steel might bring some difficulties in predicting the spring-back. [4] or cracking during the high-speed punching processes, which have been widely accepted in the automobile manufacturing
A practical constitutive model is needed to characterize the plastic behaviour of the DP steel sheet under warm-forming conditions
Summary
The application of the advanced high strength steel alloys (AHSS) has been increasing in the automobile industry for the weight reduction and collision-safe performance. It was observed that the temperature of the DP steel tends to increase during the plastic deformation [2], which would inevitably affects the plastic flow and formability of the materials [3]. A practical constitutive model is needed to characterize the plastic behaviour of the DP steel sheet under warm-forming conditions. For the purpose of describing the temperature-dependent yield behaviour of DP590, the modified Yld20002d yield criterion was proposed In this model, the exponent of the Yld2000-2d was assumed as the function of the temperature. The numerical simulations of biaxial tensile tests were conducted to confirm the validity of the proposed model
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