Investigations on fracture curves in strain and stress space for advanced high strength steel forming

Conference proceedings article

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

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รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Panich S., Drotleff K., Liewald M., Uthaisangsuk V.

ผู้เผยแพร่: IOP Publishing

ปีที่เผยแพร่ (ค.ศ.): 2016

Volume number: 734

Issue number: 3

นอก: 1742-6588

eISSN: 1742-6596

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84989237370&doi=10.1088%2f1742-6596%2f734%2f3%2f032066&partnerID=40&md5=ff3fb0263c83aedf9db114f78d1c98cd

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Conventional forming limit curves (FLCs) are inappropriate for describing formability for advanced high strength (AHS) steel sheets, since such steel grades experience fracture without localized necking occurrence. The aim of this work was to develop a fracture curve (FC) for the AHS steel grade DP980. The FC was determined by means of the Nakajima stretch forming test and tensile tests of various sample geometries, by which shear fracture governed. An optical strain measurement system was used to capture strain histories of deformed samples up to failure. From these results, fracture strains were gathered and plotted in a strain space. Subsequently, the strain based curve was transformed to space between stress triaxiality and plastic strain. Hereby, effects of anisotropic yield function, namely, the Hill'48 model on obtained stress fracture loci were investigated. In order to verify applicability of the determined limit curves, a Mini-tunnel part was pressed and simulated. It was found that the stress based FC do predict failure of the DP980 steel sheet more accurately than the strain based F C. ฉ Published under licence by IOP Publishing Ltd.

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