Abstract
Anisotropy is one of the main limitations in the effective design of 3D printed structures. Further, experimental evaluation of the material behaviour of printed parts is tedious, and expensive. An alternate solution is computational material modeling of printed parts. In the present work, the computational homogenization is applied to estimate the final constitutive behaviour of parts printed with polymeric composite material. To begin, the mesostructure of layers of the printed parts was considered for finite element modeling of the representative volume element (RVE), and to determine their elastic moduli. Computationally estimated material properties were higher than experimental values, and the percent difference between them was higher for parts made of ABS polymer containing short carbon fibers (sCF) versus ABS alone. The computational models provided more insights on the final properties of 3D printed parts for different materials. Further, the stress contours of the RVEs revealed that the printed parts are prone to two different failure types: delamination and fiber pull-out. Also, the lateral and transverse elastic moduli of layers were found to be approximately the same, and therefore the constitutive behaviour of the layers can be treated as transversely isotropic material. In summary, this research work represents an important step towards enabling the effective design and analysis of 3D printed structures using computational methodology.
Published Version
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