Impact of Infill Pattern Design on Stress-Strain behaviour of 3D Printed Parts

Compared to some conventional manufacturing processes, the properties of additive manufacturing parts can depend on the structural and manufacturing process parameters, rather than just on the type of materials used. The purpose of this paper is to evaluate the tensile mechanical properties of the components printed with a 3D printer by changing the design of the infill pattern. The study presents the data of 13 (by 3 tests for each form of filling) different infill pattern designs, prepared and tested according to the ISO 527-2:2012 standard. The samples were analyzed according to the paired sample tests, considering the weight and the results of the tests, as well as the impact of the infill pattern on the test results. Significant differences were observed among the samples in terms of engineering stress and strain. The line infill pattern demonstrated better results in the engineering strain whereas the concentric infill pattern yielded superior values for engineering stress. Regarding ultimate tensile strength, concentric infill pattern shows significantly higher results than all other samples. Taking into consideration the results of the samples, it is concluded that there are significant differences between the design of the infill pattern and the other analyzed studies, which should be considered depending on the intended use of the 3D printed elements.