Abstract
Springback is a common phenomenon in sheet metal forming, in which the material undergoes an elastic recovery as applied loads are removed. Springback causes the forming shape to deviate from the intended design geometry. This phenomenon, which can be influenced by several factors, effects on both bending angle and bending curvature. The aim of this study is to determine the influence of different tool radius and the gap between punch and die on springback in bending of DP980 Advanced High-Strength Steels (AHSS) sheet. Experimental studies are combined with FEM method in commercial ABAQUS software to determine the bending angle after springback. To predict springback in bending process, the material properties are defined by Ludwik - Hollomon law, combined with the Hill’48 criterion. Experimental results are in good agreement with numerical simulations in case of bending in the rolling direction.
Highlights
Advanced High-Strength Steels (AHSS) is gradually replacing conventional steel grades in the automotive industry because of their advanced properties such as improved formability, crash worthiness, low-mass, affordable cost and many environmental advantages [1, 2]
Previous studies have primarily focused on springback effects in AHSS grades with tensile strength less than 800MPa [17, 18]
Experimental conditions DP980 sheet steels are cut under CNC K7745M machine with different directions compared to RD: 0°, 45°, and 90°, respectively
Summary
AHSS is gradually replacing conventional steel grades in the automotive industry because of their advanced properties such as improved formability, crash worthiness, low-mass, affordable cost and many environmental advantages [1, 2]. In AHSS sheet forming, the most sensitive feature is the elastic recovery during unloading, i.e., springback, which has been widely researched since the 1990s. The amount of springback is influenced by various process parameters, such as gap between punch and die, material thickness [4], forming force, tool radius [5,6], ratio between die radius and thickness [7], blank holder force [8], and material properties including sheet anisotropy, Young's modulus, strength coefficient, and strain hardening exponent [9]. Previous studies have primarily focused on springback effects in AHSS grades with tensile strength less than 800MPa [17, 18]. For AHSS grades with a tensile strength of more than
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