Authors: Filip Dorčiak, Milan Vaško, Carlos Conceição Antonio

There has been a growing interest in characterizing 3D printed specimen to determine their structural integrity behavior. The main aim of this study is to observe the mechanical properties of specimens created by 3D printing using composite Onyx, a fusion of engineering nylon and chopped carbon fibers. Performed tests measure the force required to bend the specimens and collected data used to select size and shape of the inner structure optimizing material’s consumption. Nine specimens sized according to ISO 178 are considered. Tests carried out according to ASTM D790 and next ISO 178. For a 5% deflection, data registered when sample reaches 5% deflection or breaks before 5%. If the sample can withstand the 5% deflection, the test will continue by norm ISO 178 and stopped when the specimens breaks. Test results organized in tables and graphs are maximal force and force by 5% deflection plus the value of consumed volume of material. By considering the ratio of Force by 5 % deflection to volume of material, it is possible to address stiffness effectivity. On the other hand, ratio of maximal force to volume of material can take into account the straight effectivity.

Filip Dorčiak¹ | Milan Vaško¹ | Carlos Conceição Antonio²
1Dept of Applied Mechanics, Faculty of Mechanical Engineering, University of Žilina,  Žilina, Slovakia
2Dept de Engenharia Mecânica, Faculdade de Engenharia, Universidade do Porto, Portugal