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A novel measure for the material resistance to ductile fracture propagation under shear-dominated deformation

Journal Article


Abstract


  • Our engineered metallic materials are being designed to be more and more ductile with an increase in strength. Consequently, the failure mode has changed – from brittle to ductile fracture, which leads to a limited applicability of the previously used parameters that quantify the material resistance developed for brittle fracture. This is owing to that a considerable amount of plastic strain is introduced to the fracture process. Shear-dominated ductile fracture failure is commonly observed in many of the structural metals. In the current work, a novel measure Omega Ω is proposed, which fundamentally describes the material's ability to motivate relative mass motion in response to Mode Ι shear-dominated fracture propagation. The effects of specimen geometry, fracture tip constraint and deformation modes on Ω were discussed and analysed, which inspired the ideas of normalisation approaches that lead to the development of a dimensionless parameter Normalised Omega Ω¯. Accompanying with this concept, our systematically conducted experimental results (DWTT and SENT) indicated, that Ω¯ is independent to both in-plane and out-plane (specimen thickness) specimen configurations. So that it possesses the characteristic of being an intrinsic material constant for ductile fracture under shear mode.

UOW Authors


  •   Barbaro, Frank (external author)
  •   Gervasyev, Alexey (external author)
  •   Jiao, Jingsi
  •   Lu, Cheng

Publication Date


  • 2021

Citation


  • Jiao, J., Gervasyev, A., Lu, C., & Barbaro, F. (2021). A novel measure for the material resistance to ductile fracture propagation under shear-dominated deformation. Theoretical and Applied Fracture Mechanics, 112. doi:10.1016/j.tafmec.2020.102845

Scopus Eid


  • 2-s2.0-85099702879

Volume


  • 112

Abstract


  • Our engineered metallic materials are being designed to be more and more ductile with an increase in strength. Consequently, the failure mode has changed – from brittle to ductile fracture, which leads to a limited applicability of the previously used parameters that quantify the material resistance developed for brittle fracture. This is owing to that a considerable amount of plastic strain is introduced to the fracture process. Shear-dominated ductile fracture failure is commonly observed in many of the structural metals. In the current work, a novel measure Omega Ω is proposed, which fundamentally describes the material's ability to motivate relative mass motion in response to Mode Ι shear-dominated fracture propagation. The effects of specimen geometry, fracture tip constraint and deformation modes on Ω were discussed and analysed, which inspired the ideas of normalisation approaches that lead to the development of a dimensionless parameter Normalised Omega Ω¯. Accompanying with this concept, our systematically conducted experimental results (DWTT and SENT) indicated, that Ω¯ is independent to both in-plane and out-plane (specimen thickness) specimen configurations. So that it possesses the characteristic of being an intrinsic material constant for ductile fracture under shear mode.

UOW Authors


  •   Barbaro, Frank (external author)
  •   Gervasyev, Alexey (external author)
  •   Jiao, Jingsi
  •   Lu, Cheng

Publication Date


  • 2021

Citation


  • Jiao, J., Gervasyev, A., Lu, C., & Barbaro, F. (2021). A novel measure for the material resistance to ductile fracture propagation under shear-dominated deformation. Theoretical and Applied Fracture Mechanics, 112. doi:10.1016/j.tafmec.2020.102845

Scopus Eid


  • 2-s2.0-85099702879

Volume


  • 112