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Finite Element-Based Simulation of Metal Fused Filament Fabrication Process: Distortion Prediction and Experimental Verification

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Abstract

Building end-use functional metal parts by metal fused filament fabrication (MF3) is an emerging topic in additive manufacturing. MF3 involves extrusion of polymer filaments that are highly filled with metal powder to print three-dimensional parts, followed by debinding and sintering to eliminate the polymer binder and get a fully dense metal part, respectively. Material properties, part design and processing conditions have a significant influence on the quality of MF3 printed parts. Part distortion and dimensional variations are significant quality challenges that hinder the acceptance of printed parts in potential functional applications. Trial-and-error experiments to find the best conditions are commonly used for defect avoidance, though they are time-consuming and expensive. Hence, computational simulation and design solutions are required for MF3 to enable a virtual analysis of the process outcome and reduce dependency on experimental methods. This paper investigates the applicability of a thermo-mechanical model for finite element simulation of the MF3 printing process. The quantitative influence of material properties on MF3 printed part quality was estimated using a simulation platform. The simulation results of two materials, a Ti-6Al-4V filled polymer and an unfilled ABS copolymer, were compared to experiments. It was determined that the unfilled polymer showed greater shrinkage and warpage than the Ti-6Al-4V filled polymer in simulations and experiments. Further, the trend in the distribution of warpage was consistent between experiments and simulation results for both materials. Finally, warpage compensation algorithms showed improvement in dimensional control for both materials in simulations and were consistent with experimental results.

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Acknowledgements

The authors acknowledge the funding from the Minority Business Development Agency (MBDA) and the National Aeronautics and Space Administration (NASA) that supported this research work. The Digimat simulation platform was provided by MSC Software/Hexagon. KEYENCE Corp. provided support with VR-5000 for surface profilometry.

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Authors and Affiliations

  1. Materials Innovation Guild (MIG), University of Louisville, Louisville, KY, 40208, USA

    Mohammad Qasim Shaikh, Paramjot Singh, Kunal H. Kate & Sundar V. Atre

  2. Keyence Corporation of America, 500 Park Boulevard, Suite 200, Itasca, IL, 60143, USA

    Matthew Freese

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  1. Mohammad Qasim Shaikh
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  2. Paramjot Singh
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Correspondence to Sundar V. Atre.

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This invited article is part of a special topical focus in the Journal of Materials Engineering and Performance on Additive Manufacturing. The issue was organized by Dr. William Frazier, Pilgrim Consulting, LLC; Mr. Rick Russell, NASA; Dr. Yan Lu, NIST; Dr. Brandon D. Ribic, America Makes; and Caroline Vail, NSWC Carderock.

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Shaikh, M.Q., Singh, P., Kate, K.H. et al. Finite Element-Based Simulation of Metal Fused Filament Fabrication Process: Distortion Prediction and Experimental Verification. J. of Materi Eng and Perform 30, 5135–5149 (2021). https://doi.org/10.1007/s11665-021-05733-0

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  • DOI: https://doi.org/10.1007/s11665-021-05733-0

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