Dependence of crystal stress evolution on the vertices of the single crystal yield surface and the effect from the intergranular misorientation during plastic deformation

Tongseok Han, Sang Yeop Chung

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Understanding the behavior of deforming materials is essential for better designing innovative materials and identifying damage of materials in service. However, most engineering materials are polycrystalline and, due to the complex behavior of polycrystalline solids, in-depth analysis could not be readily conducted. As techniques such as the high-energy X-ray synchrotron experiment become available, findings from simulation can now be supported by real observation and vise versa. Using the synergic tool of combining the experiment and simulation, it has been shown that the crystal stress directions over the polycrystal aggregates are moving toward the vertices of the single crystal yield surface (SCYS). In this research, the crystal stress evolution pattern at a single crystal during plastic flow is investigated using the simulated data from finite element analyses. By investigating the crystal stress evolution of the same crystal with rearranged neighboring crystals with the same set of orientations, the effect of the intergranular misorientation on the crystal stress evolution is investigated. For the virtual specimens investigated in this study, the intergranular misorientation for the immediately neighboring grains are quantified. Then, through finite element simulations, it is confirmed that the crystal stress is not only dependent on the crystal orientation itself but also on the misorientation with the surrounding crystals. The crystal stress/strain levels for the same crystal with different intergranular misorientation are not identical since the different misorientation distributions affect the way that the grains interact. The crystal stress directions are moving toward the SCYS vertex during plastic flow but the closest vertex distributions show differences when the intergranular misorientation is changed.

Original languageEnglish
Pages (from-to)35-46
Number of pages12
JournalComputational Materials Science
Volume63
DOIs
Publication statusPublished - 2012 Oct 1

Fingerprint

Plastic Deformation
Single Crystal
misalignment
plastic deformation
Plastic deformation
apexes
Crystal
Single crystals
Crystals
single crystals
crystals
plastic flow
Plastic flow
Crystal orientation
Plastics
Polycrystalline materials
Polycrystal
Polycrystals
simulation
Synchrotrons

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Computational Mathematics

Cite this

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abstract = "Understanding the behavior of deforming materials is essential for better designing innovative materials and identifying damage of materials in service. However, most engineering materials are polycrystalline and, due to the complex behavior of polycrystalline solids, in-depth analysis could not be readily conducted. As techniques such as the high-energy X-ray synchrotron experiment become available, findings from simulation can now be supported by real observation and vise versa. Using the synergic tool of combining the experiment and simulation, it has been shown that the crystal stress directions over the polycrystal aggregates are moving toward the vertices of the single crystal yield surface (SCYS). In this research, the crystal stress evolution pattern at a single crystal during plastic flow is investigated using the simulated data from finite element analyses. By investigating the crystal stress evolution of the same crystal with rearranged neighboring crystals with the same set of orientations, the effect of the intergranular misorientation on the crystal stress evolution is investigated. For the virtual specimens investigated in this study, the intergranular misorientation for the immediately neighboring grains are quantified. Then, through finite element simulations, it is confirmed that the crystal stress is not only dependent on the crystal orientation itself but also on the misorientation with the surrounding crystals. The crystal stress/strain levels for the same crystal with different intergranular misorientation are not identical since the different misorientation distributions affect the way that the grains interact. The crystal stress directions are moving toward the SCYS vertex during plastic flow but the closest vertex distributions show differences when the intergranular misorientation is changed.",
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AB - Understanding the behavior of deforming materials is essential for better designing innovative materials and identifying damage of materials in service. However, most engineering materials are polycrystalline and, due to the complex behavior of polycrystalline solids, in-depth analysis could not be readily conducted. As techniques such as the high-energy X-ray synchrotron experiment become available, findings from simulation can now be supported by real observation and vise versa. Using the synergic tool of combining the experiment and simulation, it has been shown that the crystal stress directions over the polycrystal aggregates are moving toward the vertices of the single crystal yield surface (SCYS). In this research, the crystal stress evolution pattern at a single crystal during plastic flow is investigated using the simulated data from finite element analyses. By investigating the crystal stress evolution of the same crystal with rearranged neighboring crystals with the same set of orientations, the effect of the intergranular misorientation on the crystal stress evolution is investigated. For the virtual specimens investigated in this study, the intergranular misorientation for the immediately neighboring grains are quantified. Then, through finite element simulations, it is confirmed that the crystal stress is not only dependent on the crystal orientation itself but also on the misorientation with the surrounding crystals. The crystal stress/strain levels for the same crystal with different intergranular misorientation are not identical since the different misorientation distributions affect the way that the grains interact. The crystal stress directions are moving toward the SCYS vertex during plastic flow but the closest vertex distributions show differences when the intergranular misorientation is changed.

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