Effect of low and extreme-low temperature on mechanical properties of 3D printed polyethylene terephthalate glycol copolymer
Keywords:
cryogenic, mechanical properties, additive manufacturing, Polyethylene Terephthalate Glycol copolymerAbstract
This paper investigates the mechanical behavior of 3D-printed Polyethylene Terephthalate Glycol (PETG) before and after exposure to low and extreme-low temperature. Before printing, melt shear viscosity of the PETG was investigated as a function of temperature and shear rate to evaluate its flowability. 3D-printed PETG specimens with four different patterns (full, circular, honeycomb, and strip) were subjected to deep cryogenic treatment for 24 h, and thermal annealing cycles at –40°C. Tension tests were performed to evaluate the mechanical properties of the 3D-printed samples before and after thermal treatments. Experimental results show that mechanical properties of the 3D-printed samples have a close relationship with the printing pattern. The honeycomb specimens exhibit the highest specific strength (tensile strength/ weight) among the other 3D printing patterns. No statistical significant alterations of mechanical properties are observed after exposure to thermal annealing cycles at -40°C, indicating that this material may be successfully used to manufacture parts that will be exposed to low temperatures during operation. The mechanical properties of the cryogenically treated samples decrease significantly as compared with the un-treated samples for the same printing conditions. However, depending on the printing pattern, the 3D-printed PETG samples maintain at least 75% of its untreated mechanical properties after the cryogenic treatment.
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