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<p>The accurate determination of Forming Limit Curves (FLCs) is essential for characterizing the formability of sheet metals. In recent years, Digital Image Correlation (DIC) has become a widely adopted technique for strain measurement in FLC determination, providing full-field strain data during Nakajima or Marciniak tests. However, the influence of DIC processing parameters on the strain values remains a critical issue that can significantly affect the detection of the onset of necking and the resulting FLC. This study investigates the impact of DIC parameters on different necking analysis methods commonly used for FLC determination, including time-dependent, spatial, and combined criteria. To evaluate these effects, tests were carried out on two steel grades with different thicknesses: one with a 1.6-mm sheet, compliant with the ISO 12004-2 standard, and another with a thicker 4.04-mm sheet, outside the standard range.</p>

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Comparison of the Influence of DIC Parameters on Different FLC Necking Analyses

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Grégoire Mainguy,
  • Xavier Lemoine,
  • Tudor Balan

摘要

The accurate determination of Forming Limit Curves (FLCs) is essential for characterizing the formability of sheet metals. In recent years, Digital Image Correlation (DIC) has become a widely adopted technique for strain measurement in FLC determination, providing full-field strain data during Nakajima or Marciniak tests. However, the influence of DIC processing parameters on the strain values remains a critical issue that can significantly affect the detection of the onset of necking and the resulting FLC. This study investigates the impact of DIC parameters on different necking analysis methods commonly used for FLC determination, including time-dependent, spatial, and combined criteria. To evaluate these effects, tests were carried out on two steel grades with different thicknesses: one with a 1.6-mm sheet, compliant with the ISO 12004-2 standard, and another with a thicker 4.04-mm sheet, outside the standard range.