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<p>Dual-phase (DP) steels are widely used in automotive crash structures due to their strong balance of strength and formability. Understanding fracture behaviour during crashes has become increasingly important, driving research into how these steels perform under different strain paths, such as biaxial, uniaxial, plane strain, and shear, which commonly occur during stamping. This study examined the fracture behaviour of DP800 steel using digital image correlation to measure fracture strains under varied strain conditions. The data were used to determine equivalent fracture strain limits based on the Hosford–Coulomb (HC) ductile fracture model. A cross-die test with punch displacements of 30, 40, and 49&#xa0;mm validated the approach, with strain contours obtained through circle grid analysis. At 49-mm displacement, measured strains near the fracture site exceeded predicted limits, confirming the accuracy and reliability of the HC-based fracture strain model.</p>

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Fracture Behaviour of DP800 Steel Under Different Strain Paths

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Sisir Dhara,
  • Niluja Pakiyaraja,
  • Yi Gao,
  • Andrew Ruthven,
  • Sumit Hazra

摘要

Dual-phase (DP) steels are widely used in automotive crash structures due to their strong balance of strength and formability. Understanding fracture behaviour during crashes has become increasingly important, driving research into how these steels perform under different strain paths, such as biaxial, uniaxial, plane strain, and shear, which commonly occur during stamping. This study examined the fracture behaviour of DP800 steel using digital image correlation to measure fracture strains under varied strain conditions. The data were used to determine equivalent fracture strain limits based on the Hosford–Coulomb (HC) ductile fracture model. A cross-die test with punch displacements of 30, 40, and 49 mm validated the approach, with strain contours obtained through circle grid analysis. At 49-mm displacement, measured strains near the fracture site exceeded predicted limits, confirming the accuracy and reliability of the HC-based fracture strain model.