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Lecture

Mechanical performance and deformation characteristics of cellular structures produced by additive manufacturing techniques

Thursday (25.10.2018)
08:50 - 09:10
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Cellular structures are highly promising candidates for light-weight and resource-efficient components. By means of additive manufacturing processes cellular structures with non-stochastic architectures can be produced and, thus, predictable deformation behavior, i.e. stretch- and bending-dominated behavior, of such structures can be achieved. However, for improving the part performance the failure mechanisms prevailing in cellular structures have to be completely understood. In addition to the elementary nature of deformation, process-induced defects such as pores affect the lifetime of the structures produced, while both, the used material and its condition have a huge impact on the overall damage mechanisms and progress.

The current study focuses on the influence of the deformation mode and the material including its microstructural condition on the mechanical performance of cellular structures under quasistatic and cyclic loading. Within the framework 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 inside the cellular structures is examined. Previous results show a clear correlation between the deformation mode, the local strain distribution, the plastic deformation behavior and the lifetime. However, surface roughness as well as process-induced defects seem to vary in dependence of structural properties such as strut diameter and orientation, presumably playing a pivotal role for the mechanical performance. Based on current results, the need for further investigations is highlighted.

 

Speaker:
Tizian Arold
University of Kassel
Additional Authors:
  • Jochen Tenkamp
    TU Dortmund University
  • Florian Brenne
    University of Kassel
  • Prof. Dr. Thomas Niendorf
    University of Kassel
  • Prof. Dr. Frank Walther
    TU Dortmund University
  • Daniel Kotzem
    Technische Universität Dortmund