TY  - JOUR
T1  - Influence of Freezing Time on Hardness and Impact Resistance of 3D-Printed PLA+
TT  - 3B Baskılı PLA+ Malzemesinin Sertlik ve Darbe Dayanımı Üzerine Dondurma Süresinin Etkisi
AU  - Aslan, Enes
PY  - 2025
DA  - October
Y2  - 2025
DO  - 10.29130/dubited.1757310
JF  - Duzce University Journal of Science and Technology
JO  - DÜBİTED
PB  - Duzce University
WT  - DergiPark
SN  - 2148-2446
SP  - 1799
EP  - 1811
VL  - 13
IS  - 4
LA  - en
AB  - 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.
KW  - Freezing Time
KW  - 3D-Printed PLA+
KW  - Impact Resistance
N2  - Bu ön çalışmada, FDM tekniği kullanılarak %50 ve %100 doluluk oranlarında ve bal peteği deseninde üretilen 3B baskılı PLA+ numunelerin dondurulma süresinin darbe dayanım performansı üzerindeki etkisi araştırılmıştır. Numuneler -80 °C'de farklı sürelerle (72 saate kadar) muhafaza edilmiş ve boyutsal değişimleri, sertlikleri ile darbe dayanımları incelenmiştir. Bulgular, düşük sıcaklıklara uzun süre maruz kalan numunelerde çapta hafif bir azalma olduğunu ve bunun malzeme büzülmesinden kaynaklandığını göstermektedir. Buna karşılık, sertlik değerleri dondurulma süresiyle birlikte artmış; en yüksek Shore D sertliği 85.78 ile tam dolu numunelerde elde edilmiştir. Darbe testleri, %100 doluluk oranına sahip numunelerin %50 doluluk oranlılara göre daha fazla enerji absorbe ettiğini ortaya koymuş; en yüksek darbe dayanımı (24.53 kJ/m²) 72 saat dondurulan numunelerde ölçülmüştür. Kırık yüzey incelemeleri, dondurma süresinin çatlak ilerleme deseninde anlamlı bir değişime neden olmadığını göstermiştir. Genel olarak, elde edilen sonuçlar PLA+ malzemesinin kriyojenik koşullarda mekanik dayanımını koruduğunu ve hatta artırabildiğini göstermekte olup, bu malzemeyi zorlu çevresel koşullarda kullanılabilecek işlevsel parçalar için uygun bir aday haline getirmektedir.
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UR  - https://doi.org/10.29130/dubited.1757310
L1  - https://dergipark.org.tr/en/download/article-file/5118439
ER  -