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<p>The local formability issue like sheared edge fracture poses a significant risk to the adoption of AHSS (advanced high-strength steel). The sheared edge of AHSS parts reduces ductility and manifests as crack generation and failure during forming process, which cannot be predicted either by global formability criterion like FLC (forming limit curve) or by local formability like hole expansion test due to its inherent scatter and sensitivity to initial damage. In this study, Hosford–Coulomb fracture initiation model is calibrated using multiaxial fracture experiments like shear, uniaxial, and plane strain test. Further, the same model is used to predict the sheared edge damage profile, which consists of roll over, burnish, and fracture zone through the thickness of a dual-phase steel (DP780, 1.4&#xa0;mm). For validation, a half-specimen dome test (HSDT) is conducted to replicate the edge fracture scenario. The numerical simulations are performed in Abaqus 2023, and an attempt also has been made to map the edge damage results to PAM-STAMP (ESI) to establish a process for sheared edge history during trimming operation.</p>

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Experimental and Numerical Investigation of Sheared Edge Fracture in DP780 Using Half-Specimen Dome Test

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Pundan K. Singh,
  • Bijay K. Shah,
  • Raj Abhishek,
  • Manikandan G.,
  • Pinaki Biswas,
  • C. Lakshmana Rao,
  • Rahul K. Verma

摘要

The local formability issue like sheared edge fracture poses a significant risk to the adoption of AHSS (advanced high-strength steel). The sheared edge of AHSS parts reduces ductility and manifests as crack generation and failure during forming process, which cannot be predicted either by global formability criterion like FLC (forming limit curve) or by local formability like hole expansion test due to its inherent scatter and sensitivity to initial damage. In this study, Hosford–Coulomb fracture initiation model is calibrated using multiaxial fracture experiments like shear, uniaxial, and plane strain test. Further, the same model is used to predict the sheared edge damage profile, which consists of roll over, burnish, and fracture zone through the thickness of a dual-phase steel (DP780, 1.4 mm). For validation, a half-specimen dome test (HSDT) is conducted to replicate the edge fracture scenario. The numerical simulations are performed in Abaqus 2023, and an attempt also has been made to map the edge damage results to PAM-STAMP (ESI) to establish a process for sheared edge history during trimming operation.