An In-Plane Bending Test to Characterize Edge Ductility in High-Strength Steels

M. Masoumi Khalilabad*, E.S. Perdahcıoğlu, E.H. Atzema, A.H. van den Boogaard

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
15 Downloads (Pure)

Abstract

A novel in-plane bending test was used to study edge ductility in DP800 as a common advanced high-strength steel in the car industry. The test utilized the digital image correlation technique to measure the local and average fracture strain values along the edge of the specimen. In contrast to the widely used hole expansion capacity test, the impact of punch friction, contact stress, and out-of-plane strain on edge ductility is eliminated by removing the punch. Also, the strain gradient inherent to the beam bending provides a controlled crack propagation path, making crack tracking easier than the sheared edge tensile test. The proposed bending test was utilized to investigate the influence of material orientation, cutting parameters, and global strain gradient on edge fracture strain. A correlation was observed between edge ductility, material orientation, and cutting tool sharpness, while the average fracture strain was independent of the strain gradient. The outcome shows that the in-plane bending test is reliable for determining edge ductility in any desired material orientation.
Original languageEnglish
Pages (from-to)1892-1904
Number of pages13
JournalJournal of Materials Engineering and Performance
Volume32
Early online date22 Aug 2022
DOIs
Publication statusPublished - Feb 2023

Keywords

  • Advanced high-strength steel (AHSS)
  • Cutting clearance
  • Dual-phase (DP) steel
  • Edge crack
  • HEC
  • Strain gradient
  • UT-Hybrid-D

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