Photo of Fabian  Wein

Dr. Fabian Wein

Lehrstuhl für Angewandte Mathematik 2
Nägelsbachstr. 49b
91052 Erlangen
Germany
Room: 02.211

Email: fabian.wein@fau.de
Phone: +49 9131 85-20849

Projects

Additive Fertigung für das Flugzeug (ALM2AIR)

Luftfahrtforschungsprogramm(LuFo) 5-2

"Optimization of components for additive manufacturing"

This project aims to advance techniques for lattice optimization in the context of additive manufacturing using titanium alloy (Ti-6Al-4V). We study the full workflow from selection of parametrized base cells for stiffness optimization, the optimization algorithm, the interpretation of optimized results, as a macroscopic lattice design including predefined solid and void non-design regions, and the generation of a ready-to-print surface description of the lattice structure. For the field of structural optimization, the SGP (Sequential Global Programming) algorithm is advanced allowing the distinct choice between solid, void and lattice during the optimization process.

DFG Sonderforschungsbereich 814

C2: Robuste Struktur- und Prozessoptimierung im Kontext der additiven Fertigung
SFB814: Additive Fertigung, Teilprojekt C2
Coordinator: Prof. Dr.-Ing. D. Drummer (Erlangen)

Cluster of Excellence: Engineering of Advanced Material

project duration 2007 - 2012
Engineering of Advanced Materials: Research Area A3

Material design by inverse homogenization

The goal of the project is to optimize periodic structures with respect to given constraints which are mostly defined in cooperation with engineers. The applied methods are especially chosen to respect manufacturing constraints and are developed further in this regard. Within the scope of two project cooperations different optimization tasks are investigated. On the one hand we optimize auxetic structures, i. e. ones with a negative Poisson's ratio, and secondly we produce designs for foam-like structures with maximal stiffness. The picture on the left shows a manufactured sample on the top and an animation of the optimization process on the bottom. The fabrication process is based on additive manufacturing through selective electron beam melting using a titanium alloy (Ti-6Al-4V) and allows for a direct translation of CAD models to real world objects. Compression tests can be performed to compare numerical simulation/ optimization results to manufactured structures. The optimization process uses a known structure as initial value and optimizes its properties iteratively.  
Prof. Dr. Michael Stingl, Dipl.-Math. Fabian Schury, M.Sc. Fabian Wein

Publications

  • M. Stingl and F. Wein, “A combined parametric shape optimization and ersatz material approach”, Structural and Multidisciplinary Optimization 57, 1297–1315 (2018)
  • M. Wormser, F. Wein, M. Stingl and C. Körner, “Design and Additive Manufacturing of 3D Phononic Band Gap Structures Based on Gradient Based Optimization”, Materials 10 (2017)
  • H. Mitschke, F. Schury, K. Mecke, F. Wein, M. Stingl, and G. E. Schroder-Turk “Geometry: The leading parameter for the Poisson’s ratio of bending-dominated cellular solids”, International Journal of Solids and Structures 100, 1–10 (2016)
  • F. Wein, M. Kaltenbacher, and M. Stingl, “Topology optimization of a cantilevered piezoelectric energy harvester using stress norm constraints”, Structural and Multidisciplinary Optimization 48, 173–185 (2013)
  • J. Schwerdtfeger, F. Schury, M. Stingl, F. Wein, R. Singer, and C. Körner, “Mechanical characterisation of a periodic auxetic structure produced by SEBM”, Physica Status Solidi B-Basic Solid State Physics 249, 1347–1352 (2012)
  • F. Schury, M. Stingl, and F. Wein, “Slope constrained material design”, Structural and Multidisciplinary Optimization 46, 813–827 (2012)
  • F. Schury, M. Stingl, and F. Wein, “Efficient two-scale optimization of manufacturable graded structures”, SIAM Journal on Scientific Computing 34, B711–B733 (2012)
  • J. Schwerdtfeger, F. Wein, G. Leugering, R. Singer, C. Körner, M. Stingl, and F. Schury, “Design of Auxetic Structures via Mathematical Optimization”, Advanced Materials 23, 2650–2654 (2011)
  • E. Bänsch, M. Kaltenbacher, G. Leugering, F. Schury and F. Wein. "Optimization of Electro-Mechanical Smart Structures". In Birkäuser Special Issue: Constrained Optimization and Optimal Control for Partial Differential Equations. Editors: Prof. Dr. G. Leugerin, Prof. Dr.-Ing. S. Engell, Prof. Dr. A. Griewank, Prof. Dr. M. F. Wein, M. Kaltenbacher, E. Bänsch, G. Leugering, and F. Schury. "Topology optimization of a piezoelectric-mechanical actuator with single- and multiple-frequency excitation". In International Journal of Applied Electromagnetics and Mechanics, 30:201-221, (2009)