Short Fiber-Reinforced Acrylonitrile Butadiene Styrene for Additive Manufacturing: Process-Structure-Property Analysis E. Lobov, A. Dobrydneva, I. Vindokurov, M. Tashkinov∗ Laboratory of Mechanics of Biocompatible Materials and Devices, Perm National Research Polytechnic University, Perm 614990, Russia ∗ m.tashkinov@pstu.ru Keywords: Additive manufacturing, short carbon fiber, mechanical properties. Additive manufacturing (3D-printing) based on layer-by-layer material deposition is currently used for manufacturing of parts with complex geometry. One of the most accessible methods of 3Dprinting is fused filament fabrication (FFF), which works with polymeric materials in the form of a filament. Among the variety of thermoplastic polymers, that were adapted for this method, one of the most widely used is acrylonitrile butadiene styrene (ABS). Composites with ABS matrix and natural or synthetic microscale additives were developed to improve stiffness, elastic modulus and strength of 3D-printed structures. Although additive composites with short fiber have been successfully fabricated and are commercially available, understanding of their deformation and fracture mechanisms is a challenging problem because of complexities of the microstructural morphology. In particular, the presence of microscale defects in the form of matrix voids, fiber damage and irregular fiber orientation can alter the targeted properties of these materials after manufacturing process. The aim of this work is to investigate the effect of manufacturing parameters and resulting microstructural characteristics on the elastic and fracture properties of 3D-printed short fiberreinforced ABS samples by comparing results of both experimental and numerical studies. Mechanical properties of samples were evaluated in the series of tensile and bending tests. The samples were printed with different infill angle and using various diameter nozzles. The internal microstructure of samples was examined using micro computed tomography and scanning electronic microscopy. Finite element simulations were performed to assess effective response of materials. Representative volumes used in these numerical models were created based on real samples microstructure. In addition, analytical estimation of the effective elastic properties was performed using Mori-Tanaka homogenization scheme. New results on stiffness and strength properties of short fiber-reinforced 3D-printed samples were obtained and compared with those made of standard ABS material. 90
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