Analytical Modeling of Strain Rate Distribution During Friction Stir Processing |
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Authors: | BM Darras MK Khraisheh |
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Affiliation: | (1) Center for Manufacturing and Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506, USA |
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Abstract: | Friction Stir Processing (FSP) is becoming an acceptable technique for modifying the grain structure of sheet metals. One
of the most important issues that hinder the widespread use of FSP is the lack of accurate models that can predict the resulting
microstructure in terms of process parameters. Most of the work that has been done in the FSP field is experimental, and limited
modeling activities have been conducted. In this work, an analytical model is presented that can predict the strain rate distribution
and the deformation zone in the friction stir processed zone as a function of process parameters. In the model, the velocity
fields within the processed zone are determined by incorporating the effects of both the shoulder and the pin of the tool
on the material flow. This is achieved by introducing state variables and weight functions. The model also accounts for different
interfacial conditions between the tool and the material. The effects of different process parameters and conditions on the
velocity fields and strain rate distributions are discussed. The results clearly show that the model can successfully predict
the shape of the deformation zone and that the predicted strain rate values are in good agreement with results reported in
the literature.
This article was presented at the AeroMat Conference, International Symposium on Superplasticity and Superplastic Forming
(SPF) held in Baltimore, MD, June 25-28, 2007. |
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Keywords: | friction stir processing interfacial contact conditions microstructure modification severe plastic deformation strain rate distribution |
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