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Investigation of the Effective Parameters and Procedures to Reduce Residual Stress of Parts Produced by Wire arc Additive Manufacturing (WAAM)

Tangestani, Reza | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50606 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farrahi, Gholamhossein
  7. Abstract:
  8. Wire arc additive manufacturing (WAAM) is used to manufacture parts in large scale, low cost, and at high rate of production. One of the problems of this technique is the creation of residual stress in the produced components. The aim of this study is to investigate the efficiency of procedures reducing the amount of residual stress to ameliorate the WAAM technique. In this research, the WAAM method and the procedures for reducing the amount of residual stress are explained. Also the advantage of this technique is presented. Due to the enormous amount of parameters and for the aim of saving time and expense, the simulation method is used. The accuracy of the simulation was checked with available results found in literature. In order to achieve the best result, the fine element size for the rolling and shot peening methods are used for the rest of the simulations. By varying the parameters we tried to reduce the amount of residual stress. For each vertical-rolling and side-rolling, three parameters and for shot peening two parameters were examined. To study the effect of different arc movement pattern, a model with high deposited layers was simulated and for clamp position, six various models were considered. Finally, all the achieved results were examined with each other and the cons and pros of each one were explained. Consequently, by changing some parameters, for example clamps position, the residual stress could be reduced to the half of the initial one
  9. Keywords:
  10. Shot Peening ; Residual Stress ; Simulation ; Rolling Process ; Wire and Arc Additive Manufacturing

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