Anisotropie plastic behavior of trip 780 steel sheet in hole expansion test
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Publication Details
Author list: Panich S., Uthaisangsuk V., Suranuntchai S., Jirathearanat S.
Publisher: Trans Tech Publications
Publication year: 2012
Volume number: 504-506
Start page: 89
End page: 94
Number of pages: 6
ISBN: 9783037853665
ISSN: 1013-9826
eISSN: 1662-9795
Languages: English-Great Britain (EN-GB)
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Abstract
Plastic behavior of advanced high strength steel sheet of grade TRIP780 (Transformation Induced Plasticity) was investigated using three different yield functions, namely, the von Mises's isotropic, Hill's anisotropic (Hill'48), and Barlat's anisotropic (Yld2000-2d) criterion. Uniaxial tensile and balanced biaxial test were conducted for the examined steel in order to characterize flow behavior and plastic anisotropy in different stress states. Additionally, disk compression test was performed for obtaining the balanced r-value. According to the different yield criteria, yield stresses and r-values were calculated for different directions and then compared with experimental data. To verify the modeling accuracy, a hole expansion test was carried out experimentally and numerically by FE simulation. Stress-strain curve from the biaxial test was described using voce and swift hardening models. Punch load and stroke, final hole diameter, and strain distribution on specimen surface along the hole circumference and the specimen diameter in rolling and transverse directions were determined and compared with the experimental results. It was found that the simulations applying Yld2000-2d yield function provided an acceptable agreement. Consequently, it is noted that the anisotropic yield potential significantly affects the accuracy of the predicted deformation behavior of sheet metal subjected to hole expanding load. ฉ 2012 Trans Tech Publications Switzerland.
Keywords
Hole expansion test, Plastic anisotropy
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