Constitutive models for the dynamic behaviour of direct metal laser sintered AlSi10Mg_200C under high strain rate shock loading

Metal additive manufacturing has been a revolutionary step in designing new complex shapes with a faster and cleaner building capacity in comparison to subtractive manufacturing processes. The ability to print lightweight alloys such as aluminum has made metal 3D printing attractive to different industries from aerospace to energy sector and bioengineering. Of particular interest in this study, are the mechanical properties of AlSi10Mg_200C alloys under high strain rate regimes. In this work, samples in horizontal and vertical printing directions were additively manufactured using an EOS M290 machine through the Direct Metal Laser Sintering (DMLS) technique. High strain rate impact tests were then carried out using a split-Hopkinson pressure bar to investigate the mechanical properties and dynamic behaviour of DMLS-AlSi10Mg_200C in both build directions. Furthermore, a constitutive model was developed for both printing directions to encompass the results, which used varying strain rates to better understand the high strain rate behaviour of these alloys. Finally, a parametric study followed to demonstrate the effect of each parameter for both models.