Manufacturing Technology 2021, 21(2):200-206 | DOI: 10.21062/mft.2021.024

Influence of the shape of the filling on the mechanical properties of samples made by 3D printing

Zdeněk Joska1, Lukáš Andrés1, Tomáš Dražan1, Karel Maňas2, Zdeněk Pokorný1, Josef Sedlák3
1 Department of Mechanical Engineering, Faculty of Military Technology, University of Defence, 662 10 Brno, Czech Republic
2 Department of Aircraft Technology, Faculty of Military Technology, University of Defence in Brno, 612 10, CZ Czech Republic
3 Department of Industrial Engineering and Information Systems, Faculty of Management and Economics, Tomas Bata University in Zlín, Mostní 5139, 760 01 Zlín, Czech Republic

In this work the influence of material type and sample fill density was evaluated. One PLA material was tested. Test specimens having different fill structure and density were printed from this material. Full honeycomb and gyroid shapes were used for the fill structure. The specimens had four different fill percentages for each structure: 10%, 25%, 50% and 75%. These bodies were compared to samples that were printed with 100% fill. Tensile test was performed on printed test pieces. The Zwick / Roell Z100 was used for testing and the surface hardness of the test specimens was measured by the Shore D method on a DIGI-Test II hardness tester. Fracture surfaces were evaluated on an Olympus DSX 500 optodigital microscope. The results showed that the shape of the fill did not signifi-cantly affect the values obtained by the tensile test. The hardness measurement results showed a different hardness on the bottom surface that was in contact with the printing pad and the top printing surface. Fractographic analysis revealed different types of fracture surfaces related to the printed fill structure.

Keywords: 3D printing, tensile test, hardness, infill
Grants and funding:

Supported by the specific research project 2020 „SV20-216“at the Department of Mechanical Engineering, University of Defence in Brno and the Project for the Development of the Organization „DZRO Military autonomous and robotic systems“.

Received: November 1, 2020; Revised: February 7, 2021; Accepted: February 16, 2021; Prepublished online: March 22, 2021; Published: April 6, 2021  Show citation

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Joska Z, Andrés L, Dražan T, Maňas K, Pokorný Z, Sedlák J. Influence of the shape of the filling on the mechanical properties of samples made by 3D printing. Manufacturing Technology. 2021;21(2):200-206. doi: 10.21062/mft.2021.024.
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