Experimental Investigation of Nozzle Temperature Effect on Tensile Strength of PLA Material in FDM Processes with a Nozzle Diameter of ۰.۶ mm

The fused deposition modeling (FDM) process is the most widely used additive manufacturing and ۳D printing method. One of the most important challenges of the FDM process is the strong dependence of mechanical and physical properties on printing parameters. The purpose of this research is to investigate the effect of the basic printing parameter of nozzle temperature (at three temperatures of ۱۹۰, ۲۰۰ and ۲۱۰ degrees Celsius) with a nozzle diameter of ۰.۶ mm on tensile strength. Examining the results of the tensile strength of the samples showed that with a change of ۲۰ degrees Celsius in the temperature of the nozzle, the tensile strength can change by ۵-۱۰% (from ۳۲.۱ MPa to ۳۸.۱ MPa). The highest tensile strength corresponds to the temperature of ۲۱۰ degrees and the lowest tensile strength corresponds to the temperature of ۱۹۰ degrees. Also, the scanning electron microscope images of the fracture surface of the printed samples showed that all the printed samples have micro-holes at the interface between the layers, and removing these micro-holes is inevitable due to the nature of FDM ۳D printing.