Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
Volume 235, Issue 10, Pages 1811-1827Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0954406219856383
Keywords
Fused deposition modeling (FDM); poly-lactic acid (PLA); part orientation; infill pattern; infill density; tensile strength; fracture surfaces
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Fused deposition modeling is a widely used additive manufacturing process that can create samples with complex geometrical shapes. This study explored the significant impact of part orientation, infill pattern, and infill density on tensile strength. Results showed that parts printed with flat part orientation and concentric pattern exhibited maximum tensile strength, while increasing infill density also increased tensile strength.
Fused deposition modeling is an additive manufacturing process in which successive layers of material are deposited to create a three-dimensional object. It is the most widely used additive manufacturing process because of its ability to make specimen having difficult geometrical shape. However, building end-user functional parts using fused deposition modeling proved to be a challenging task because of a wide variety of processing parameters. In the present paper, a detailed experimental study on open source 3D printer is reported to explore the effect of various fused deposition modeling process parameters viz. part orientation, infill density and infill pattern on tensile properties and modes of failure. Poly-lactic acid filament is used to make 3D specimens. The experimental values of tensile properties are measured and critically analysed. Failure modes under various tests are studied using scanning electron microscopy. Tensile test results indicate that part orientation, infill pattern and infill density significantly affect the tensile strength. It has been observed that parts printed with flat part orientation and concentric pattern exhibit maximum tensile strength. While tensile strength has been increasing with increment in infill density. From the SEM images, it has been found that one of the major causes of failure is weak strength within and between layers for the lower value of infill density.
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