@article{article_1757310, title={Influence of Freezing Time on Hardness and Impact Resistance of 3D-Printed PLA+}, journal={Duzce University Journal of Science and Technology}, volume={13}, pages={1799–1811}, year={2025}, DOI={10.29130/dubited.1757310}, author={Aslan, Enes}, keywords={Freezing Time, 3D-Printed PLA+, Impact Resistance}, abstract={This preliminary study investigates the effect of freezing duration on the impact and strength performance of 3D-printed PLA+ specimens produced with 50% and 100% infill densities in a honeycomb pattern using the FDM technique. Samples were stored at -80 °C for varying time intervals (up to 72 hours), and their dimensional changes, hardness, and impact resistance were evaluated. Results indicate that prolonged exposure to sub-zero temperatures caused a slight reduction in specimen diameter, likely due to material shrinkage. Conversely, hardness values increased with freezing time, reaching a maximum Shore D value of 85.78 for fully solid samples. Impact testing revealed that 100% infill density specimens absorbed more energy than 50% counterparts, with the highest impact strength (24.53 kJ/m²) observed after 72 hours of freezing. Visual analysis showed no significant variation in crack trajectory with freezing duration. Overall, the findings suggest that PLA+ retains and even improves its mechanical robustness under cryogenic conditions, making it a promising candidate for applications requiring durability in extreme environments.}, number={4}, publisher={Duzce University}