PSI - Issue 37

Mohammad Reza Khosravani et al. / Procedia Structural Integrity 37 (2022) 97–104 Mohammad Reza Khosravani et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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occurred in 0 ° specimens. This can be related to the fact that in the 0 ° specimens, the rasters are along the loading direction and these specimens showed highest strength, therefore, a defect can significantly change the mechanical performance of these 3D-printed parts.

Fig. 3. Force-displacement curves of examined; intact parts (left) and defected specimens (right).

Experimental practice confirmed that in both group of intact and defected specimens, 0 ° printed parts showed highest strength. Considering the slope of the force-displacement curves, it is concluded that the intact 0 ° 3D-printed parts showed highest stiffness equal to 545.7 N/m that was reduced to 438.5 N/m in the defected 0 ° specimens. Moreover, the defected 90 ° specimens showed lowest fracture load and stiffness. 5. Conclusions AM as one of the promising manufacturing processes, has been widely used recently. FDM is a popular AM process used for 3D printing polymer components. Since different manufacturing defects can occur during fabrication process, it has become an important issue. This manuscript investigates the effects of manufacturing defect on the mechanical behavior and structural integrity of the FDM 3D-printed parts. To this aim, 3D-printed PLA-wood specimens were fabricated and examined. Specifically, two groups of intact and defected specimens were printed and their tensile behaviors were compared. In the defected specimens gaps are intentionally placed which is considered as a defect. The experimental results confirmed that defect in 3D-printed parts leads to decrease in fracture load and stiffness of the components. This study has demonstrated that highest strength belongs to the 0 ° 3D-printed parts. The presented results can be used for finite element simulation and its verification. 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).