Abstract
In this paper, the microstructure and mechanical properties that distribute regulation along the rolling direction of tailor rolled blanks (TRB) were investigated. A tensile specimen with equal probability in yield (EYS) was first designed considering variation both in thickness and in material strength. The uniaxial tension test was carried out with a digital image correlation method to analyze the mechanical behaviors. The results showed that the strain distribution of EYS was homogeneous. From the results, it can be known that a new design philosophy for a TRB tensile specimen is reasonable and EYS is suitable to characterize the mechanical behavior of TRB. The true stress-strain curves of metal in different cross sections of TRB were calculated. On the basis of the true stress-strain curves, a material model of TRB was constructed and then implemented into finite element simulations of TRB uniaxial tensile tests. The strain distribution of numerical and experimental results was similar and the error between the elongation of the specimen after fracture obtained by experiment and FE ranged from 9.51% to 13.06%. Therefore, the simulation results match well with the experimental results and the material model has high accuracy and as well as practicability.
Highlights
Due to the development of lightweight technology in the automobile industry, tailored blanks based on new material processing technology such as tailor welded blanks (TWB) and tailor rolled blanks (TRB) have been widely studied and well developed recently
TRBregion specimens with necking by tensile shownitinhappens can be observed the the necking region occurs in the thin area of the conventional tensile width specimen with (CWS), whereas it happens on the transition zone of and EYS, the fracture position is closer to the middle of the specimen
Table necking region occurs in the thin area of the CWS, whereas it happens on the transition zone of CAS1
Summary
Due to the development of lightweight technology in the automobile industry, tailored blanks based on new material processing technology such as tailor welded blanks (TWB) and tailor rolled blanks (TRB) have been widely studied and well developed recently. Liu [2] summarized the advantages of TRB, namely, shorter production process, uniform thickness transition, and better surface quality and forming properties compared with TWB and patchwork blanks. As a typical lightweight product, the potential of TRB has already been recognized. The design and forming process of TRB still presents certain issues. The mechanical properties of TRB are different from those of a constant-thickness blank and the research methods cannot fully draw on the experience of TWB. The main factors influencing the mechanical properties of TRB are the various thicknesses and work-hardening degrees along the rolling direction
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