SKM 2023 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 12: Poster I

MM 12.32: Poster

Monday, March 27, 2023, 18:15–20:00, P2/OG1+2

MD Simulation of 3D Laser Printing — •Jonas Schmid, Kevin Vietz, Dominic Klein, and Johannes Roth — FMQ University of Stuttgart, Stuttgart, Germany

While most people associate the manufacturing of metal parts with a CNC milling machine, the Fraunhofer Society developed an additive manufacturing process in 1995 which is based on laser melting of a metal powder. In this process, metal components are printed layer by layer, while the metal powder is fused onto the previous layer.

Our research focuses on developing molecular dynamics (MD) simulations of 3D laser printing in order to study defects such as gas pockets, cracks or structural irregularities caused by the manufacturing process. In contrast to finite element method calculations, MD simulations describe the highly non-equilibrium dynamics on an atomistic scale. This allows for a more physical interpretation while making less assumptions on the system.

In particular, our simulated system contains a three-dimensional multi-layer powder structure on a fixed ground surrounded by a protective gas. The simulation features laser absorption depending on atom density and atom type, as well as active cooling by using a different thermostat integrator for the ground layer. The overall goal of our research is to optimize the laser and powder properties to reduce defects and increase the stress resistance of the sample.