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Title: Pre-strain effect on twist springback of a 3D P-channel in deep drawing
Author: Chen, Shanshan
Liao, Juan
Xiang, Hongliang
Xue, Xin
Pereira, António B.
Keywords: Strain path
Twist springback
Issue Date: Jan-2021
Publisher: Elsevier
Abstract: With the widely use of high-strength steel sheets in the automotive industry, the twist springback phenomenon of the steel sheets under multi-step forming conditions has received extensive attention. In this work, the Dual Phase steel DP500 is taken as the research object to investigate the complex non-linear elastoplastic behaviors and twist springback under two-step loading paths. The large specimen with a pre-strain of 4% true strain in rolling direction is carried out on a large tensile testing machine, and several specific blanks are extracted from it at different directions for a subsequent P-channel forming. The influence of twist springback associated with the pre-strain is analyzed. The finite element model based on the non-linear elastic model and the homogeneous anisotropic hardening model (HAH) is also established for the springback prediction and stress analysis. The results indicate that the pre-strain has a considerable impact on the twist springback. The non-linear strain path changes resulted from pre-straining not only influence the residual stress but also affect the elastic modulus distribution.
Peer review: yes
DOI: 10.1016/j.jmatprotec.2019.05.005
ISSN: 0924-0136
Appears in Collections:DEM - Artigos

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