MODELING OF TENSILE AND BENDING STRENGTH FOR PLA PARTS PRODUCED BY FDM

Abstract

Fused deposition modeling (FDM) is one of the commonly used additive manufacturing methods to produce quality products with low cost complex geometries with efficient manufacturing and delivery logistics. Mechanical properties can be improved by examining numerous FDM parameters and/or using new materials through this method. In this study, mathematical models have been developed for estimation of some mechanical properties of parts produced by using PLA+ plastic material by FDM method. For this purpose, standard tensile and bending test samples were produced with 3D printer at three different printing speeds and filling ratio with two different raster angles. The effects of process parameters on tensile and bending strength were analyzed experimentally and statistically. According to the experimental results, the importance order of the parameters for mechanical properties of PLA+ based samples were determined as filling ratio, raster angle and printing speed. Tensile and bending strengths were higher in samples produced at 0/90° raster angle. On the other hand, it was determined that the increase in the printing speed decreased the tensile and bending strength proportionally. Between the results obtained from the mathematical models developed with multiple regression analysis and experimental results, an average deviation of 3% for tensile strength and 2% for bending strength were found.

Keywords

• FDM,Tensile strength,Bending strength,PLA,Modelling

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