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<p>The forming limit curve (FLC) is an essential tool for studying the formability of sheet metal to design an industrial product. Before localized strain starts, the sheets can resist a maximum amount of deformation, known as the FLC. The procedure for determining an FLC experimentally is very time-consuming and requires specialized and expensive equipment. This study aimed to numerically predict the forming limit curve of DP780 steel sheets using necking criteria and investigate how yield criteria affect numerical prediction. In this investigation, finite element (FE) modeling of the Nakazima test was performed using Abaqus/Explicit. To numerically predict the FLCs at the necking. Von Mises, Hill’48, and Barlat’s (YLD91) yield criteria and a criterion for determining the onset of localized necking were investigated. The necking criterion is based on the analysis of the first component of the limit strain. A comparison is made between the numerical results of the FLC and the experimental FLC. Von Mises yield criterion is not suitable for DP780 steels. The precision of the Hill criterion may not be sufficient to accurately predict the limit deformations in the right part of the FLC of DP780. The YLD91 criterion works well and gives results that are acceptable when compared to the Hill48 criterion for the right and left sides of the curve.</p>

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Effect of yield criteria in the numerical prediction of forming limit curves of advanced high-strength steel using the necking criterion

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Khalid Bouziane,
  • Taoufik Aalouch,
  • Abdelhadi El Hakimi,
  • Iliass El Mrabti,
  • Abderrahim Chamat,
  • Abdelhamid Touache

摘要

The forming limit curve (FLC) is an essential tool for studying the formability of sheet metal to design an industrial product. Before localized strain starts, the sheets can resist a maximum amount of deformation, known as the FLC. The procedure for determining an FLC experimentally is very time-consuming and requires specialized and expensive equipment. This study aimed to numerically predict the forming limit curve of DP780 steel sheets using necking criteria and investigate how yield criteria affect numerical prediction. In this investigation, finite element (FE) modeling of the Nakazima test was performed using Abaqus/Explicit. To numerically predict the FLCs at the necking. Von Mises, Hill’48, and Barlat’s (YLD91) yield criteria and a criterion for determining the onset of localized necking were investigated. The necking criterion is based on the analysis of the first component of the limit strain. A comparison is made between the numerical results of the FLC and the experimental FLC. Von Mises yield criterion is not suitable for DP780 steels. The precision of the Hill criterion may not be sufficient to accurately predict the limit deformations in the right part of the FLC of DP780. The YLD91 criterion works well and gives results that are acceptable when compared to the Hill48 criterion for the right and left sides of the curve.