Developing the properties of polymer based composites materials by manufacturing with additive manufacturing

Sandwich composite structures are widely used in engineering materials where high strength, high impact probability and low density are important. Developing 3D printing technology has started to replace traditional production methods, especially complex shaped engineering materials which are difficult to product and have long process steps. In this thesis study flat plate sandwich samples were printed on FDM printer with commercial acrylonitrile butadiene styrene (ABS) and commercial polycarbornate acrylonitrile butadiene styrene flame retardant (PC/ABS) filaments and they preserve their mechanical properties. According to the tensile test results, the values of the maximum stress for ABS and PC/ABS materials were 29,09 MPa and 27,79 MPa respectively. According to the impact test protections, the absorbed energy of ABS and PC/ABS materials was reached at a rate of %17,69 and %32,70, respectively. According to the results, structures with higher impact defense and absorbing energy of composite partitions have been achieved. Compared to the mechanical properties of commercially available ABS and PC/ABS filaments, the mechanical structure of the sandwich samples obtained was lower and the mechanical parts of the printer systems were predicted to come. It is known that three-dimensional printers are also used on products with negative Poisson ratio. The Poisson ratio, which is effective in determining the properties of materials, is usually around 0,3. The auxetic assumption with negative Poisson ratio is known to have mechanical automation, such as higher energy dissipation, compared to tests with positive Poisson ratio. In this thesis study, it was also aimed to examine the mechanical properties of compression and impact test specimens with traditional honeycomb core structure sandwich composite structure obtained as a result of ABS and PC/ABS, with double arrow head and tetrachiral core geometries with auxetic structure by FDM. It was observed that tetrachiral sucture reached the maximum force of ABS and PC/ABS 3106,23 N and 3312,70 N respectively.