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Investigation of Texture Effects on the Deformation of Sheet Metals using Crystal Plasticity Theory

Khajeh Salehani, Mohsen | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45949 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Assempour, Ahmad; Mehdigholi, Hamid
  7. Abstract:
  8. The orientations which predominate in a final orientation distribution resulted from a specific deformation mode are the ideal orientations. There is a set of ideal orientations for each of crystal structures under a predefined mode of deformation. Ideal orientations are one of the material characteristics in the applied mode of deformation. The material texture strongly influences its final properties and affects the material behaviour in the subsequent forming processes.
    In this project, final texture of 1010 steel sheet resulted from simple tension mode of deformation is investigated computationally and experimentally. The calculated texture based on the simulation procedure is compared with the experimental result. Besides this texture prediction, another part of this project is focused on the on determination of the complete set of ideal orientations of various cubic crystal structures in different modes of deformation.
    To this end, a rate-sensitive crystal plasticity model is employed which can consider the effects of initial texture on deformation. To predict the final texture, a polycrystalline model is developed and the mechanical properties and initial texture is extracted from performed experiment. For calculating the ideal orientations of a crystal structure, the evolutions of crystal orientations into the ideal orientations are tracked. The loading is applied incrementally until all of the lattice spin components become permanently zero. To verify the accuracy of the presented Euler space scanning method, the ideal orientations of plane strain compression loading are calculated and compared with the existing experimental results. Afterward, by applying this method to the equibiaxial tension mode of deformation, ideal orientation of this mode of deformation is calculated.
    Finally, the effects of deformation mode on the resulting ideal orientations in the range of biaxial tension mode of deformation, from plane strain to equibiaxial tension, are investigated. This analysis is performed for the FCC crystal structures. It is observed that by increasing the ratio of strain rate components in this range, rolling texture components are gradually replaced by ideal orientations of equibiaxial tension loading. Also, for the case of 0.25 ratio, ideal orientations almost equally contain some fibers resulted from equibiaxial tension loading and some orientations obtained from plane strain mode of deformation
  9. Keywords:
  10. Strain Rate Sensitivity ; Crystal Plasticity ; Ideal Orientations ; Slip Systems ; Lattice Spin ; Deformation Gradient

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