Abstract
As a new type of variable thickness sheet structure, the TRB (tailor rolled blank) has good prospects for the development of lightweight materials in the automotive industry. However, springback is a key issue in production. Research on TRB springback characteristics has great significance for further applications due to variations in the sheet thickness and gradient distribution of the material mechanical properties. In this study, the springback characteristics of TRBs were investigated by means of the finite element code ABAQUS/USDFLD and experiments taking cylindrical bending as an example. The results showed that the cylindrical bending process of the TRB gradually evolved from three-point bending to four-point bending and, finally, to multipoint bending. At same time, the gradient of the thickness leads to the nonuniform longitudinal distribution of the von Mises stress. On the contrary, larger bending angles can be achieved by reducing R and improving Rd, but t/T has little effect on the bending angles. In terms of the influence of springback, increasing Rd and reducing R and t/T can lead to a smaller springback angle. This project provided an important opportunity to advance the understanding of TRB springback characteristics.
Highlights
Energy savings and environmental protection requirements necessitate lightweight designs for cars
(3) When the curvature of the tailor rolled blanks (TRBs) is greater than the curvature of the cylinder, the contact point moves to both sides, and the three-point bending transforms into four-point bending
To describe the gradient of the mechanical properties with the TRB thickness, the user subroutine USDFLD programmed in FORTRAN is used to build the material model. e deformation behaviours in the cylindrical bending process of the TRB are calculated
Summary
Energy savings and environmental protection requirements necessitate lightweight designs for cars. Automobile body covering parts made of tailor rolled blanks (TRBs) can help reach these goals. TRBs are manufactured by means of a flexible rolling process. In this production process, the sheet thickness is obtained by controlling the gaps between the working rollers. Reports on the TRB manufacturing process are well represented in the literature [1,2,3,4]. In TRB applications, one of the main problems is the springback problem caused by elastic recovery in the formation process. TRBs with variations in sheet thickness and gradient distributions of mechanical properties have special springback characteristics. Erefore, it is necessary to investigate the springback characteristics of TRBs and further develop their properties TRBs with variations in sheet thickness and gradient distributions of mechanical properties have special springback characteristics. erefore, it is necessary to investigate the springback characteristics of TRBs and further develop their properties
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