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Fracture Loci in Sheet Metal Forming: A Review

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Fracture in sheet metal forming usually occurs as ductile fracture, rarely as brittle fracture, at the operating temperatures and rates of loading that are typical of real processes in two different modes: (1) tensile and (2) in-plane shear (respectively, the same as modes I and II of fracture mechanics). The circumstances under which each mode will occur are identified in terms of plastic flow and ductile damage by means of an analytical approach to characterize fracture loci under plane stress conditions that takes anisotropy into consideration. Fracture loci was characterized by means of the fracture forming limit line and by the shear fracture forming limit line in the fracture forming limit diagram. Experiments were performed with single point incremental forming and double-notched test specimens loaded in tension, torsion and in-plane shear give support to the presentation and allow determining the fracture loci of AA1050-H111 aluminium sheets with 1 mm thickness. The relation between fracture toughness and the fracture forming limits was also investigated by comparing experimental values of the strains at fracture obtained from a truncated conical part produced by single point incremental forming and from double-notched test specimens loaded in tension.

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Acknowledgments

M.B. Silva and P.A.F. Martins would like to acknowledge the support provided by Fundação para a Ciência e a Tecnologia of Portugal within project LAETA-UID/EMS/50022/2013 and SFRH/BSAB/105959/2015. K. Isik and A. E. Tekkaya gratefully acknowledge funding by the German Research Foundation (DFG) within the scope of the Transregional Collaborative Research Centre on sheet-bulk metal forming (SFB/TR 73) in the subproject C4 ‘Analysis of load history dependent evolution of damage and microstructure for the numerical design of sheet-bulk metal forming processes’.

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Authors and Affiliations

  1. IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal

    M. Beatriz Silva & Paulo A. F. Martins

  2. Institute of Forming Technology and Lightweight Construction, Technical University of Dortmund, Baroper Str. 303, 44227, Dortmund, Germany

    Kerim Isik & A. Erman Tekkaya

Authors
  1. M. Beatriz Silva
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  2. Kerim Isik
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  3. A. Erman Tekkaya
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  4. Paulo A. F. Martins
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Correspondence to Paulo A. F. Martins.

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Available online at http://link.springer.com/journal/40195

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Silva, M.B., Isik, K., Tekkaya, A.E. et al. Fracture Loci in Sheet Metal Forming: A Review. Acta Metall. Sin. (Engl. Lett.) 28, 1415–1425 (2015). https://doi.org/10.1007/s40195-015-0341-6

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  • DOI: https://doi.org/10.1007/s40195-015-0341-6

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