A microstructure based modelling of high strength steel sheet under stretch-bending
Conference proceedings article
ผู้เขียน/บรรณาธิการ
กลุ่มสาขาการวิจัยเชิงกลยุทธ์
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รายละเอียดสำหรับงานพิมพ์
รายชื่อผู้แต่ง: Achineethongkham K., Thanakijkasem P., Uthaisangsuk V.
ผู้เผยแพร่: IOP Publishing
ปีที่เผยแพร่ (ค.ศ.): 2018
Volume number: 1063
Issue number: 1
นอก: 1742-6588
eISSN: 1742-6596
ภาษา: English-Great Britain (EN-GB)
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บทคัดย่อ
In the automotive industry, advanced high strength (AHS) steel sheets are widely used for various structural and safety parts in car body. Such AHS steels exhibit complex microstructures containing different phase constituents. The yield and tensile strength of these steel sheets are significantly increased, but the formability is very restricted due to earlier occurred local damages. Their fracture behaviours are thus strongly governed by the microstructure characteristics and interplays between various phases. Besides, the forming processes of AHS parts mostly showed a non-linear strain history, for which the conventional forming limit curve (FLC) could not be properly applied. In this work, stretch-bending tests were carried out for the AHS steel sheet grade 980 after subjected to different pre-strains. FE simulations on the micro-scale of the forming experiments were performed by using 2D representative volume element (RVE) model, which was generated from the real microstructure of examined steel. Hereby, local crack occurrences in the microstructure of steel were described. Furthermore, the FE results by using isotropic and kinematyc hardening law were compared. Vinally, the bending limits of steel grade 980 after varying pre=strains were predicted. ฉ 2018 Institute of Physics Publishing. All rights reserved.
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