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Korean Journal of Metals and Materials > Volume 56(3); 2018 > Article
Korean Journal of Metals and Materials 2018;56(3): 210-220. doi: https://doi.org/10.3365/KJMM.2018.56.3.210
590MPa급 고강도강의 성형 시 스프링백 예측 정확도에 미치는 판재이방성의 영향
박세계, 백응률, 박노근
영남대학교 신소재공학과
Effect of Anisotropy on Springback Prediction in Forming of 590MPa High Strength Steel
Se Kye Park, Eung Ryul Baek, Nokeun Park
Division of Materials Science and Engineering, Yeungnam University, Gyeongbuk 38541, Republic of Korea
Correspondence  Eung Ryul Baek ,Tel: +82-83-810-2473, Email: erbaek@yu.ac.kr
Nokeun Park ,Tel: +82-53-810-2534, Email: nokeun_park@yu.ac.kr
Received: 14 June 2017;  Accepted: 5 January 2018.  Published online: 6 March 2018.
ABSTRACT
Material parameters, extracted from mechanical behavior in a uniaxial direction without considering anisotropy in the rolling direction, are commonly used when doing forming analysis. However, when these material parameters are used for the forming analysis of a material which has large anisotropy, inaccurate analysis results can be obtained. In this study, the material parameters of the Yoshida-Uemori model, 0°, 45°, 90° to the rolling direction were extracted. When we used the material parameters extracted from three directions, each according to their rolling directions, the accuracy of the springback prediction was increased. We analyzed the effect of material parameters on the accuracy of the springback prediction, using nine material parameters. As a result, it was found that ‘B-Y’ and ‘m’ affected the accuracy of the springback prediction the most. When we compared this result to other studies, it showed outstanding accuracy for sidewall curl prediction. This shows the importance of considering the anisotropy of steel sheet, to increase accuracy of the springback analysis.
Keywords: anisotropy, springback, kinematic hardening, Yoshida-Uemori Model, U-bending
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