期刊
METALS AND MATERIALS INTERNATIONAL
卷 22, 期 6, 页码 1009-1014出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-016-6346-5
关键词
metals; deformation; mechanical properties; tensile test; stretch-flangeability
资金
- Brain Korea 21 PLUS project for Center for Creative Industrial Materials [F16SN25D1706]
- International Research & Development Program of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning (MSIP) of Korea [NRF-2014K 1A3A1A49070466]
Stretch-flangeability measured using hole expansion test (HET) represents the ability of a material to form into a complex shaped component. Despite its importance in automotive applications of advanced high strength steels, stretch-flangeability is a less known sheet metal forming property. In this paper, we investigate the factors governing hole expansion ratio (HER) by means of tensile test and HET. We correlate a wide range of tensile properties with HERs of steel sheet specimens because the stress state in the hole edge region during the HET is almost the same as that of the uniaxial tensile test. In order to evaluate an intrinsic HER of steel sheet specimens, the initial hole of the HET specimen is produced using a milling process after punching, which can remove accumulated shearing damage and micro-void in the hole edge region that is present when using the standard HER evaluation method. It was found that the intrinsic HER of steel sheet specimens was proportional to the strain rate sensitivity exponent and post uniform elongation.
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