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Failure mechanisms and damage tolerance of cellular structures produced by additive manufacturing techniques

Thursday (27.09.2018)
11:30 - 11:45 S1/01 - A3
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Cellular structures are promising candidates for light-weight and resource efficient components. Additive manufacturing allows for establishing cellular structures having a non-stochastic architecture and, thus, enables for achieving predictable deformation behavior, i.e. stretch and bending dominated behavior. However, the failure mechanisms, especially under cyclic loading conditions, are crucially to be understood in order to be able to improve the part performance. In addition to the elementary nature of deformation, process-induced defects affect the lifetime to failure. However, the material applied and its condition have a huge impact on the overall damage behavior.

The current study focusses on the influence of the deformation mode and the material including its microstructural condition on the mechanical performance of cellular structures under static and cyclic loading. Using the example of different materials, e.g. Ti-6Al-4V alloy and 316L stainless steel, the effect of the material ductility on the damage initiation and propagation within the cellular structures is examined. Results show a clear correlation between the deformation mode, the local strains distribution, the plastic deformation behavior and the lifetime to failure. However, process related phenomena, such as residual stresses and process-induced defects seem to play a pivotal role for the fatigue behavior. Based on current results, the need for further investigations is highlighted

Additional Authors:
  • Daniel Patrick Kotzem
    TU Dortmund University
  • Jochen Tenkamp
    TU Dortmund University
  • Prof. Dr. Frank Walther
    TU Dortmund University
  • Dipl.-Ing. Florian Brenne
    Universität Kassel