Metals and Materials International

, Volume 23, Issue 3, pp 519–531 | Cite as

Formability evaluation for hot-rolled HB780 steel sheet based on 3-D non-quadratic yield function

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Abstract

A common practice to evaluate formability in the typical sheet metal forming process is to measure hardening behavior and a forming limit diagram as separate material properties, and perform numerical forming simulations utilizing various yield functions. The measured forming limit diagram is applied as the failure criterion. However, the performance of material properties such as hardening behavior and yield functions in predicting strain localization in the simple tension and forming limit diagram tests is seldom validated before their application to forming simulation. In this study, a new numerical formability evaluation procedure was proposed, in which not only hardening behavior but also measured forming limit data were employed in characterizing the input data for the hardening behavior and the yield function. Besides, strain localization was directly monitored to determine failure without employing any forming limit criterion. The new procedure was applied for rather thick advanced high strength hot-rolled steel sheet so that 3-D continuum elements were utilized along with 3-D non-quadratic Hosford and quadratic Hill yield functions.

Keywords

metal hot-rolled steel sheet sheet formability tensile test drawing 

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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Department of Materials Science and Engineering, Research Institute of Advanced Materials, Engineering Research InstituteSeoul National UniversitySeoulRepublic of Korea
  2. 2.Steel Solution CenterPOSCOIncheonRepublic of Korea
  3. 3.Department of Materials Science and EngineeringKorea UniversitySeoulRepublic of Korea

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