PSI - Issue 41

Aleksa Milovanović et al. / Procedia Structural Integrity 41 (2022) 290 – 297 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 6. Size criterion values for all the tested specimens with average values per each batch.

3. Conclusions In FDM technology printing parameters have a significant effect on mechanical properties of 3D printed parts. Concerning fracture toughness assessment, printing parameters may not only have an impact on the final results, but may also question the eligibility of the test. In this paper the influence of printing parameters on the crack path direction and linear behavior was studied based on the number of applied layer outlines. It was shown that the smaller outline number results in linear behavior, i.e., linear progression of force values. Also, the estimation of infill density contribution (10% to 100%) to K Ic values has been studied, as well as its influence on the size criterion estimation for the fulfilment of plane-strain condition. The K Ic value was between 0.38 and 2.69 √ , indicating that infill density has a significant impact on fracture toughness results. Acknowledgements The authors would like to thank the support from European Union’s Horizon 2020 research and innovation program (H2020-WIDESPREAD2018, SIRAMM) under grant agreement No. 857124. References Milovanović, A., Milošević, M., Mladenović, G., Likozar, B., Čolić, K., Mitrović, N., 2019. Experimental Dimensional Accuracy Analysis of Reformer Prototype Models Produced by FDM and SLA 3D Printing Technology, in ‘’Experimental and Numerical Investigatio ns in Materials Science and Engineering’’. In: Mitrović, N., Milošević, M., Mladenović, G. (Ed.). Springer, Cham, pp. 84 -95. Milovanović , A., Sedmak, A. , Grbović , A. , Golubović , Z. , Mladenović , G. , Čolić , K. , Milošević , M., 2020. Comparative analysis of printing parameters effect on mechanical properties of natural PLA and advanced PLA-X material. Procedia Structural Integrity 28, pp. 1963-1968. Valean, C., Marsavina, L., Marghitas, M., Linul, E., Razavi, J., Berto, F., 2020a. Effect of manufacturing parameters on tensile properties of FDM printed specimens. Procedia Structural Integrity 26, pp. 313-320. Pand ž i ć , A., Hod ž i ć , D., Milovanovi ć , A., 2019. Effect of Infill Type and Density on Tensile Properties of PLA Material for FDM Process. 30th DAAAM International Symposium on Intelligent Manufacturing and Automation, Vienna, Austria; Paper #074: pp. 545-554. Akhoundi, B., Behravesh, A.H., 2018. Effect of Filling Pattern on the Tensile and Flexural Mechanical Properties of FDM 3D Printed Products. Experimental Mechanics 59, pp. 883-897. BS EN ISO 527-2: Plastics, Determination of tensile properties, Test conditions for moulding and extrusion plastics, 2012. DOI: 10.3403/30216860U.