Title
Optimization in Friction Stir Welding: With Emphasis on Thermomechanical Aspects,Used
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This book deals with the challenging multidisciplinary task of combining variant thermal and thermomechanical simulations for the manufacturing process of friction stir welding (FSW) with numerical optimization techniques in the search for optimal process parameters. The FSW process is characterized by multiphysics involving solid material flow, heat transfer, thermal softening, recrystallization and the formation of residual stresses. Initially, the thermal models were addressed since they in essence constitute the basis of all other models of FSW. Following this, several integrated thermomechanical models of the process were developed to simulate temperature and stress evolution during welding and subsequent cooling, i.e. eventually leading to the residual stress state and reduced mechanical properties, as well as to predict the final weld's load carrying capacity. These models were finally combined with classical singleobjective and evolutionary multiobjective optimization algorithms (i.e. SQP and NSGAII), to find the optimum process parameters (heat input, rotational and traverse welding speeds) that would result in favorable thermomechanical conditions for the process.
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