Advances on hot extrusion and simulation of light alloys : by A Erman Tekkaya; Nooman Ben Khalifa

By A Erman Tekkaya; Nooman Ben Khalifa

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Read Online or Download Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009 PDF

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Additional info for Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009

Example text

The gDRX theory claims that elongated grains become serrated and spin off, with the result that new grains have been formed. The well-directed adjustment of the microstructure, as mentioned above, could be easier with the help of finite element analysis, because at present the adjustment is done by experiences and trial and error. In this connection, a simulation could be a tool to predict the changes in grain sizes. The increasing capacity of the calculation resources has induced the utilization of finite element simulations in metal forming analysis, especially in the extrusion sector.

As it can be seen in the corner of the container the displacement vectors have less density and are smaller compared to the middle of the block. These zones represent the dead material zone and main deformation zone, respectively.   I: Dead zone II: Shear zone III: Deformation zone IV: Die exit  Fig. 2: Displacement vector of material during simulation of the extrusion process (left) and different zones of deformation from experiment (right). Fig. 3 shows the distribution of equivalent plastic strain (left) and the non-dimensional grain size (right) in the simulation of extrusion.

Modelling and simulation FEM model. 1). As a reason of the high extrusion ratio, a high deformation degree occurs with variable friction coefficients, temperature changes and variable stress and strain rate values (Figs. 2, 3). The data structure of the program includes the governing equations, the mesh of the billet, the rheology of the material, the tool description, the frictional interface and the numerical parameters [6]. The program uses implicit FEM to calculate the hot working parameters: load, strain rate, temperature field and deformation.

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