期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 287, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2019.05.005
关键词
Strain path; Pre-strain; Twist springback; HAH
资金
- NSFC (National Natural Science Foundation of China) [51805087]
- Natural Science Foundation of Fujian province of China [2018J01761]
- Major Science and Technology Project in Fujian Province [2017HZ0001-2]
- Open test funding project for valuable instruments in Fuzhou University [2019T014]
This study investigated the twist springback phenomenon and the influence of pre-strain under two-step loading paths using Dual Phase steel DP500. The results showed that pre-strain has a considerable impact on twist springback.
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.
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