Characterization of the Fracture Forming Limits in Bulk Forming by Means of Radial Extrusion

Rui F.V. Sampaioa, João P.M. Pragana, Ivo M.F. Bragança, Carlos M.A. Silva, Chris V. Nielsen, Paulo A.F. Martins*

*Corresponding author for this work

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

This paper introduces a new formability test based on double-action radial extrusion to characterize material formability in the three-dimensional to plane stress material flow transitions that are found in bulk metal formed parts. The work was developed in a multidirectional tool, which was designed to convert the vertical press stroke into horizontal movement of the compression punches towards each other, and involved experimental strain determination, fractography and finite element analysis. Results show that the transitions to plane-stress at the flanges lead to different modes of fracture (by tension and by shear) that may or may not be preceded by necking, like in sheet metal forming. The new formability test also reveals adequate to characterize the failure limits of very ductile metallic materials, which cannot be easily determined by conventional upset compression tests, and to facilitate the identification of the instant of cracking and of the corresponding fracture strains by combination of the force vs. time and strain vs. time evolutions.
Original languageEnglish
Publication date2023
Number of pages25
Publication statusPublished - 2023
Event26th International Forging Conference - Porto Alegre , Brazil
Duration: 4 Oct 20236 Oct 2023

Conference

Conference26th International Forging Conference
Country/TerritoryBrazil
CityPorto Alegre
Period04/10/202306/10/2023

Keywords

  • Formability test
  • Stress state transitions
  • Double-action radial extrusion
  • Digital image correlation
  • Fractography
  • Finite element method

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