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Prediction of Strain Field in Strip and Work-Roll During Cold Rolling of a Low Carbon Steel

Koohbor, Behrad | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41161 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Serajzadeh, Siamak
  7. Abstract:
  8. In this research, distribution of stress, strain and temperature fields in the strip and workroll were determined during steady state cold rolling process. To do this, first an initial guess based on the approach proposed by Hill for the velocity field was taken and accordingly, the real velocity distribution and then the strain rate and stress fields in the strip were calculated. Then, using the obtained stress and strain rate fields, the deformation power was determined and used as a boundary condition for solving the thermal behavior of the strip. By considering the Streamline Upwind Petrov-Galerkin method and solving the finite element relations, the temperature distribution within the strip and in the deformation zone was obtained. In the next step, the temperature at the surface of the strip along with the calculated rolling force were utilized as the boundary conditions to solve the finite element equations for the work-roll. Experiments such as hardness testing were performed to verify the results of the modeling in this work, with which the accuracy of the proposed model was confirmed. The finite element model used in this work can be considered as a proper and accurate means of studying the deformation behavior of strip and work-roll during cold strip rolling process. Also, a comparison between the calculation costs of the present model and commercial finite element packages reveals that the model in this work is much less cost-consuming than the commercial finite element softwares
  9. Keywords:
  10. Cold Rolling ; Velocity Field ; Finite Element Method ; Petrov-Galerkin Approach

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