Nowadays, additive manufacturing (AM) plays a very important role for the fast, reliable and functional production of complex structures. Many materials, from metal to plastic, can be used to print structures with different AM methods. Fused Deposition Modeling (FDM) is one of the most popular methods for 3D printing using polymeric materials. In this study, two different FDM 3D printed thermoplastic materials, Polylactic acid (PLA) and Polyamide (PA), were investigated to examine the effects of build orientation and layer thickness on tensile properties. All tensile specimens were produced with the same parameters except layer thickness and print direction. Three different layer thicknesses, 0.1 mm, 0.15 mm and 0.20 mm, and three different building direction, horizontal, vertical and flat, were investigated. Tensile tests were carried out for 18 different variations at room temperature. According to the results obtained, the tensile strength of the samples printed in the vertical direction is significantly lower for both materials, regardless of the layer thickness, compared to other directions. In addition, it has been observed that the tensile strength of the flat printed parts is better than the horizontal printed parts. Although the polyamide material exhibits a ductile behavior in general, it was determined that the samples printed in the vertical direction became quite brittle. On the other hand, the effect of layer thickness on tensile strength was different in PA and PLA samples. The highest tensile strength of the samples produced from PA and PLA material was obtained with 0.15 mm and 0.1 mm layer thickness, respectively.
Anahtar Kelimeler: 3D Printing, Layer Thickness, Build Orientation, Tensile Test
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