Strain- And stress-based forming limit curves of DP440 steel sheet with application to the cross-die forming test
Conference proceedings article
ผู้เขียน/บรรณาธิการ
กลุ่มสาขาการวิจัยเชิงกลยุทธ์
รายละเอียดสำหรับงานพิมพ์
รายชื่อผู้แต่ง: Nakwattanaset A., Suranuntchai S., Panich S.
ผู้เผยแพร่: American Institute of Physics Inc.
ปีที่เผยแพร่ (ค.ศ.): 2020
Volume number: 2279
ISBN: 9780735440098
นอก: 0094243X
ภาษา: English-Great Britain (EN-GB)
บทคัดย่อ
In this study, experimental and numerical forming limit curves (FLC) and forming limit stress curves (FLSC) for DP440 high-strength steel (HSS) sheets were developed and analysed in depth. Initially, an FLC was experimentally determined by means of the Nakajima stretch-forming test. Subsequently, two more FLCs were numerically derived through the Marciniak-Kuczinsky (M-K) model. During the numerical processes, Hills 48 was considered the anisotropic yield criterion for one and Yld2000-2d for the other. Both, however, analogously took the Swift model as their hardening law. In addition, all of those experimental and M-K based FLCs were transformed into the corresponding FLSCs, yet again, with the help of both Hills 48 and Yld2000-2d. It was found that the resulting FLSCs were significantly affected by the selected choice of the anisotropic yield model. The M-K-Yld2000-2d-based FLC and FLSC agreed clearly well with the experimental FLC and experimental-Yld2000-2d FLSC, respectively, than the M-K-Hill48- based FLC and FLSC. Finally, a cross-die forming test was conducted in order to prove those FLCs and FLSCs practical applicability. It could apparently be concluded that the FLSCs could more precisely define the formability behaviour of DP440 than the FLCs. Furthermore, Yld2000-2d represented the anisotropic plastic deformation better than Hill48, regarding the strain distributed on the formed part from the cross-die forming test. © 2020 Author(s).
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