A Mathematical Model-Based Optimization Method for Direct Metal Deposition (DMD) of Multi-Materials

[+] Author and Article Information
Jingyuan Yan

ASME Membership Mechanical Engineering Clemson University Clemson, SC 29630

Ilenia Battiato

Assistant Professor Mechanical Engineering San Diego State University San Diego, CA 92182

Georges M. Fadel

ASME Membership and fellow Professor Mechanical Engineering Clemson University Clemson, SC 29630

1Corresponding author.

ASME doi:10.1115/1.4036424 History: Received September 08, 2016; Revised April 03, 2017


During the past few years, metal based additive manufacturing technologies have evolved and may enable the direct fabrication of heterogeneous objects with full spatial material variations. A heterogeneous object has potentially many advantages and in many cases can realize appearance and/or functionality that homogeneous objects cannot achieve. In this work we employ a pre-process computing combined with a multi-objective optimization algorithm based on the modeling of the Direct Metal Deposition (DMD) of dissimilar materials to optimize the fabrication process. The optimization methodology is applied to the deposition of Inconel 718 and Ti-6Al-4V powders with prescribed powder feed rates. Eight design variables are accounted in the example, including the injection angles, injection velocities, and injection nozzle diameters for the two materials, as well as the laser power and scanning speed. The multi-objective optimization considers that the laser energy consumption and the powder waste during the fabrication process should be minimized. The optimization software modeFRONTIER® is used to drive the computation procedure with a MATLAB code. The results show the design and objective spaces of the Pareto optimal solutions, and enable the users to select preferred setting configurations from the set of optimal solutions. A feasible design is selected corresponds to a relatively low material cost, with laser power 370 W, scanning speed 55 mm/s, injection angles 15º, injection velocities 45 m/s for Inconel 718, 30 m/s for Ti-6Al-4V, and nozzle widths 0.5 mm under the given condition.

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