PSI - Issue 28

Mohammad Reza Khosravani et al. / Procedia Structural Integrity 28 (2020) 720–725 M.R. Khosravani and T. Reinicke / Structural Integrity Procedia 00 (2020) 000–000

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5. Conclusions

Considering applications of 3D printing in fabrication of structural elements, it is necessary to determine mechan ical behavior of 3D-printed parts. In the present study, we determined e ff ects of raster direction and printing speed on the fracture behavior of 3D-printed PLA specimens. In this context, specimens were printed with di ff erent raster directions under printing speed of 20 mm / s and 80 mm / s. A series of tensile tests was performed under quasi-static loading conditions to determine behavior of di ff erent specimens. Based on the experimental practice, we documented stress-strain curve of the test coupons. The results confirmed that 0 ◦ specimens and 90 ◦ specimens showed highest and lowest strength, respectively. Moreover, experimental findings indicated that increase in raster direction has led to a decrease in elastic modulus and tensile strength of examined specimens. These deceases in elastic modulus and tensile strength were occurred for all the specimens printed with di ff erent speeds. In comparison of printing speed and raster direction, the latter showed greater e ff ects on the strength of 3D-printed components. Decrease in the strength of the part can be related to the occurred defects (e.g., voids and gaps) at higher printing speed.

Acknowledgements

This work as part of the project “Smart Production Design Center” (SmaP) is funded by the European Regional Development Fund (ERDF) under the program OP EFRE NRW 2014-2020 ( EFRE- 0200545 ).

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