The Impact of Printing Orientation on The Tensile Properties of Parts Printed by Fused Deposition Modelling
Tran, Nhu (2019)
Tran, Nhu
2019
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2019121426726
https://urn.fi/URN:NBN:fi:amk-2019121426726
Tiivistelmä
This thesis work aims to study the relation between the tensile properties and print orientation of a PLA product produced by FDM printing process. The testing methods include tensile tests, analytical calculation and computational simulation. Testing specimens were printed based on ISO 527-2 standard. There are totally 11 types of models with diverse print settings. Tensile tests were conducted on samples printed in 3 fundamental orientations (flat, on-edge and upright), along with layer height (0.1, 0.2, 0.5 mm) and infill density (10%, 50%, 95%). The experiment examines the main tensile properties: elastic modulus, ultimate tensile strength, and strain. Optical microscopy was used for examining samples’ surface microstructure.
The principal stress measured in COMSOL software is 17.64% higher and 16% lower than the ones derived from the Mohr’s circle and the stress concentration method, respectively. Experimental results show that the upright printed specimens possessed the lowest strength among three orientations and the strength difference for many print parameters between the flat and on-edge position is slightly small, ranging from 0.34% to 4.3%. However, in the case when the layer height was set at 0.5 mm, this difference has risen up to 37%. Moreover, it was found that the tensile strength was considerably enhanced when the infill density was set at 95%. Although process parameters were proved to have an effect on the overall strength of the manufactured part, there are other factors that could be applied to optimize the material properties.
The principal stress measured in COMSOL software is 17.64% higher and 16% lower than the ones derived from the Mohr’s circle and the stress concentration method, respectively. Experimental results show that the upright printed specimens possessed the lowest strength among three orientations and the strength difference for many print parameters between the flat and on-edge position is slightly small, ranging from 0.34% to 4.3%. However, in the case when the layer height was set at 0.5 mm, this difference has risen up to 37%. Moreover, it was found that the tensile strength was considerably enhanced when the infill density was set at 95%. Although process parameters were proved to have an effect on the overall strength of the manufactured part, there are other factors that could be applied to optimize the material properties.