Skip navigation
SuUB logo
DSpace logo

  • Home
  • Institutions
    • University of Bremen
    • City University of Applied Sciences
    • Bremerhaven University of Applied Sciences
  • Sign on to:
    • My Media
    • Receive email
      updates
    • Edit Account details

Citation link: http://nbn-resolving.de/urn:nbn:de:gbv:46-00105808-15
00105808-1.pdf
OpenAccess
 
copyright

Verzugsminimierung bei selektiven Laserschmelzverfahren durch Multi-Skalen-Simulation


File Description SizeFormat
00105808-1.pdf9.53 MBAdobe PDFView/Open
Other Titles: Distortion minimization in laser beam melting by multi-scale-simulation
Authors: Keller, Nils  
Supervisor: Ploshikhin, Vasily
1. Expert: Ploshikhin, Vasily
2. Expert: Heinzel, Carsten 
Abstract: 
In this work an effcient method for the prediction of residual stresses and distortions of parts generated by the additive manufacturing process Laser Beam Melting (LBM) is presented. The method allows to calculate the LBM build-up process at least 100 times faster than state-of-the-art approaches for realistic macroscopic components based on a structural Finite Element Analysis. The developed approach is based on the fact, that remaining strains cause the residual stresses within the part. These inherent strains can be derived by complex thermo-mechanical simulations on microscale. Based on the known stress and strain distribution during the process, scanning trajectories were optimized with respect to the reduction of end deformations, plastic strains and stresses during the build-up process. Based on the calculated displacements after the release from the baseplate, distortions can further be minimized by at least factor ten for one iteration if inverted displacements are back-mapped to the computer aided design. The combination of these two simulation driven methods leads to a nearly zero distortion fabrication while process stability rises.
Keywords: Additive Manufacturing, Laser Beam Melting, Selective Laser Melting, FEM-Simulation, Inherent Strain Method, Distortion compensation, Strain minimization
Issue Date: 14-Mar-2017
Type: Dissertation
URN: urn:nbn:de:gbv:46-00105808-15
Institution: Universität Bremen 
Faculty: FB1 Physik/Elektrotechnik 
Appears in Collections:Dissertationen

  

Page view(s)

67
checked on Jan 16, 2021

Download(s)

16
checked on Jan 16, 2021

Google ScholarTM

Check


Items in Media are protected by copyright, with all rights reserved, unless otherwise indicated.

Legal notice -Feedback -Data privacy
Media - Extension maintained and optimized by Logo 4SCIENCE