Research on the Influence of Processing Parameters on the Specific Tensile Strength of FDM Additive Manufactured PET-G and PLA Materials

Abstract

Fused deposition modeling (FDM) is one of the most accessible additive manufacturing (AM) technologies for processing polymeric materials. It allows processing most of thermoplastic polymers, with polyethylene terephthalate glycol-modified (PET-G) and polylactic acid (PLA). AM parts tend to display anisotropic behavior because of layer-by-layer fabrication and various technological parameters that can be set for 3D print, so it is hard to predict and analyze how the manufactured parts would behave under load. This research presents results of classic tensile strength tests performed on 57 PET-G specimens and 57 PLA specimens manufactured with varying technological parameters such as: printing temperature, print orientation, layer height, and infill percentage. Afterward, a comparative analysis is performed, proposing specific tensile strength (STS) as a benchmark to determine how 3D printed parts strength is varying due to beforementioned parameters, eliminating bias induced by varying weight of specimens. The biggest relative increase of UTS and the biggest relative decrease of STS was noted for variable infill percentage (increasing infill—PLA: 37.27% UTS increase and 30.41% STS decrease; PET-G: 24.42% UTS increase and 37.69% STS decrease). The biggest relative increase of STS between examined parameters was observed for both materials as the printing temperature was increased (27.53% for PLA and 12.69% for PET-G). Similar trends in STS changes were observed for both materials. Obtained data shows which FDM AM parameters are the most important to obtain the biggest UTS of manufactured parts, and those do not overlap with parameters needed to obtain optimal strength-to-weight ratio.

Experimental study of the effect of different 3D printing parameters on tensile strength, using artificial neural network

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Evaluation of the Hemp Shive (Cannabis sativa L.) Energy Requirements Associated with the Biocomposite Compaction Process

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On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG

“…Aiming to further increase the mechanical properties of PETG-printed specimens, various experimental approaches have been used, including aging-induced relaxation [ 20 ], accurate control of overlap ratio parameters [ 21 ], layer spatial orientation [ 22 ], and the use of complex architectures, such as honeycomb structures [ 23 ]. However, increasing mechanical resistance at room temperature (RT) in the amorphous state might decrease the magnitude of SME due to difficulties in inducing a deformed temporary shape that is different from the permanent one [ 24 ].…”