Abstract

Due to the increasing spread of additive manufacturing processes, the use of the process-specific potentials of this manufacturing technology is coming into focus. One of these potentials is the production of geometrically highly complex components such as cellular structures, also called lattice structures. One application of these materials is dynamic energy absorption. In order to develop and use such structures, an efficient simulation is essential. In this study, the Johnson Cook material and damage model is fitted to polyamide 12, which is processed by selective laser sintering, and subsequently used to perform crash simulations with lattice structures. The results are compared to drop tower tests. Based on this investigation, the Johnson Cook material and damage model is suitable for such simulations. The deviation between simulation and test increases with increasing deflection of the specimens. For specimens that fully absorb the impact energy, the deviations are larger than for those that exhibit a densification phase. Therefore, further refinements of the fitting are necessary and can lead to a further improvement of the results.

 

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