Abstract
Sintering technology is becoming increasingly important in metal industry as they offer numerous advantages comparing to other manufacturing processes. So that, the powder metal (PM) technology is currently well-established for the manufacturing of near-net-shape thin-walled sintered components with strong cross-sectional transitions, especially in the automotive industry. The density gradients in the green bodies caused during the powder compacting process lead to the sintering distortion which is a relevant problem in this industry. The numerical simulation based on the finite element method (FEM) can provide a significant contribution in the design and optimization of powder compacting processes to reliably reduce such problems. Here, the material modeling required for the FE calculation is of crucial importance. In this presented work, the DRUCKER-PRAGER-Cap model was chosen for the numerical description of the compressible behavior of magnesium powder. Here, in the first step, the material-dependent failure line was determined on the basis of diametrical and uniaxial compression tests. In the second step, the elliptical caps depending on the relative density were specified by means of a simple axial compression test combined with the assumption of associated flow. This material modeling is then used to study the influence of the powder compacting strategy on the homogeneity in the distribution of the relative density is shown for the rotationally symmetric L-shape.
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Acknowledgements
This work has been done at the Institute of Forming Technology and Machines (IFUM) of the Leibniz Universitaet Hannover (LUH).
This study is part of the investigations within the research project “Near-net shape production of complex, sintered components made of magnesium powder”. The authors would like to thank the German Research foundation (DFG) for the financial support.
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Bouguecha, A., Behrens, BA. (2020). Magnesium Powder Compacting. In: Barkallah, M., Choley, JY., Louati, J., Ayadi, O., Chaari, F., Haddar, M. (eds) Mechatronics 4.0. MECHATRONICS 2019. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-46729-6_8
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DOI: https://doi.org/10.1007/978-3-030-46729-6_8
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