Simulation

Products and Services Simulation

Applications

  • Concepts for controlling laser manufacturing processes
  • Resonator design for high power lasers

Development of Processes and Components

  • Optics, beam guiding and beam forming
  • Generation of defined polarization
  • Heat conduction and thermomechanics
  • Phase change: melting, recast and vaporization
  • Fluid dynamics of melt flows
  • Simulation of gas flows and nozzle design

Analysis

  • Beam diagnostics, process control and monitoring
  • Image processing, analysis of experimental data

Process Quality

  • Roughness, ripple and dross in cutting
  • Low distortion welding with well-defined welding depth
  • Minimization of heat affection and crack formation
  • Process windows and limits
  • Sensitivity and robustness
  • Analysis of process stability

Simulation

  • Dynamical simulation of processes
  • In-house High Performance Computing (HPC) cluster
  • Computational steering
  • Efficient numerical methods
  • Metamodelling
  •  Process optimization

Project Results

Publications

Aden, M.:
Influence of the laser-beam distribution on the seam dimensions for laser-transmission welding:
A simulative approach
Lasers Manuf. Mater. Process, Online first (11 S.) (2016)

Bürgermeister, L., Hermann, M., Fehér, K., Molano Lopez, C., Pich, A., Hannen, J., Vogt, F., Schulz, W.:
Modelling pH-optimized degradation of microgel-functionalized polyesters
J. Healthcare Eng. 2016 (8 S.) (2016)

Sun, M., Eppelt, U., Hartmann, C., Schulz, W., Zhu, J., Lin, Z.:
Damage morphology and mechanism in ablation cutting of thin glass sheets with picosecond pulsed lasers
Opt. & Laser Technol. 80, 227-236 (2016)

Eppelt, U., Al Khawli, T.:
Metamodeling of laser cutting
AIP Conference Proceedings 1648, S. 710002 (2015)

Hermanns, T., Thombansen, U., Stoyanov, S.:
Modelling for self-optimization in laser cutting
AIP Conference Proceedings 1648, 710003  (2015)

Sun, M., Eppelt, U., Schulz, W., Zhu, J.:
Mechanism of internal modification in bulk borosilicate glass with picosecond laser pulses at high repitition rates
Proc. SPIE 9532, 953214 (13 S.) (2015)

Bürgermeister, L., Romero López, F. , Schulz, W.:
Physical and mathematical modeling of antimicrobial photodynamic therapy
J. Biomed. Opt. 19, 071411 (10 S.) (2014)

Reinhard, R., Al Khawli, T., Eppelt, U., Meisen, T., Schilberg, D., Schulz, W., Jeschke, S.:
The contribution of virtual production intelligence to laser cutting planning processes
In: Enabling Manufacturing Competitiveness and Economic Sustainability, Proc. of the 5th International Conference on Changeable, Agile, Reconfigurable and Virtual production (CARV2013), October 6th - 9th 2013, Munich, 117-124 (2013)

Reinhard, R., Eppelt, U., Al-Khawly, T., Meisen, T., Schilberg, D., Schulz, W., Jeschke, S.:
How virtual production intelligence can improve laser-cutting planning processes
22nd International Conference on Production Research, ICPR 2013. July 28th - August 1st, 2013, Iguassu Falls, Brazil. Iguassu Falls (7 S.) (2013)

Sun, M., Eppelt, U., Russ, S., Hartmann, C., Siebert, C., Zhu, J., Schulz, W.:
Numerical analysis of laser ablation and damage in glass with multiple picosecond laser pulses
Opt. Expr. 21, 7858-7867 (2013)

Sun, M., Eppelt, U., Schulz, W., Zhu, J.:
Role of thermal ionization in internal modification of bulk borosilicate glass with picosecond laser pulses at high repetition rates
Opt. Mat. Expr. 3, 1716-1726 (2013)

Thombansen, U., Purrio, M., Buchholz, G., Hermanns, T., Molitor, T., Willms, K., Schulz, W., Reisgen, U.:
Measurement of process variables in melt based manufacturing processes
In: ISMTII 2013 - The 11th International Symposium on Measurement Technology and Intelligent Instruments
Aachen /Braunschweig July 1st-5th 2013 (6 S.) (2013)

Vossen, G., Hermanns, T., Schüttler, J.:
Analysis and optimal control for free melt flow boundaries in laser cutting with distributed radiation
ZAMM Zs. Angew. Math. Mech. (Early view) 20 S. (2013)

Bürgermeister, L., Mikalauskaite, R., Vossen, G., Schulz, W.:
Antimikrobielle Photodynamische Therapie - Analyse des Ablaufs der chemischen Prozesse
Automatisierungstechnische Verfahren für die Medizin
10. Workshop 29./30. März 2012, pp.13-14, (2012)

Thombansen, U., Beckers, M., Buchholz, G., Hermanns, T., Molitor, T.,
Willms, K., Reisgen, U., Schulz, W.:
Signal processing for self-optimising manufacturing systems in
laser-cutting and gas-metal-arc-welding

1st Joint International Symposium on System-Integrated
Intelligence, 114-116, (2012)

Poprawe, R., Schulz, W., Schmitt, R.:
Hydrodynamics of material removal by melt expulsion: Perspectives of laser cutting and drilling
Physics Procedia 5, Nr 1,1-18, 2010

Schulz, W., Nießen, M., Vossen, G., Schüttler, J.:
Modelling and process monitoring of laser processing
Fraunhofer Allianz Numerische Simulation NUSIM: 1. Int. Conf. Multiphysics Simulation - Advanced Methods for Industrial Engineering June 22-23, 2010 in Bonn, 19 S., (2010)

Schulz, W., Pfeiffer, S., Zäh, M., Föckerer, T., Schober, A.:
Untersuchung der strukturellen Stabilität von Modellen zur Schweißverzugssimulation bei Stahlwerkstoffen
Forschungsbericht FOSTA, Forschung für die Praxis P 708, 2010. 71 S. ISBN 3-937567-77-1

Vossen, G., Schüttler, J., Nießen, M.:
Optimization of partial differential equations for minimizing the roughness of laser cutting surfaces
In: Diehl, M., Glineur, F., Jarlebring, E., Michiels, W. (Eds.): Recent Advances in Optimization and its Applications in Engineering. Berlin, Heidelberg: Springer, pp. 521-530. ISBN 978-3-642-12598-0, (2010)

W. Schulz, U. Eppelt:
Basic concepts of laser drilling
In: The Theory of Laser Materials Processing: Heat and Mass Transfer in Modern Technology. Ed. J. M. Dowden
Dordrecht: Springer Series in Materials Science, Vol. 119
pp. 129-165, (2009)

J. Schüttler, J. Lose, R. Schmitt, W. Schulz:
Exploring processing domain boundaries of complex production processes using a metamodeling approach
12th CIRP Conf. on Modelling of Machining Operations, May 7-8, 2009, San Sebastian (Spain). Ed.: P.J. Arrazola. Vol. 2
Paris: CIRP 2009, pp. 835-841, (2009)

W. Schulz, M. Nießen, U. Eppelt, K. Kowalick:
Simulation of laser cutting
In: The Theory of Laser Materials Processing: Heat and Mass Transfer in Modern Technology. Ed. J. M. Dowden
Dordrecht: Springer Series in Materials Science, Vol. 119
pp. 21-69, (2009)

N. Pirch, K. Wissenbach:
Mechanisms during laser bending
J. Laser Appl. 20, Nr 3, 135-139, (2008)