Additive manufacturing such as 3D printing is considered as a highly convenient manufacturing process since it enables to create any 3D objects. It is known that different materials, printing techniques, and printing parameters are affecting the mechanical properties of the printed objects. However, studies on the mechanical properties of the 3D printed structure are still limited. In this work, investigation of the relationship between two printing parameters, i.e. infill pattern and infill density were conducted on the Polylactic Acid (PLA) material. Three infill densities, 25%, 50%, and 75%, and three infill patterns, grid, tri-hexagon, and concentric, were chosen. The tensile test, ASTM D638, was employed to obtain the material properties based on these two printing parameters. An open-source 3D printing slicer software, Cura, was used to manufacture the tensile specimens. The Young’s modulus, yield strength, and ultimate strength were recorded and examined. The results showed that the tensile properties increase as infill density increases. Of the three-printing pattern, the concentric has the highest values of tensile properties regardless of the infill densities. This finding can be used as a reference for creating a finite element model (FEM) as well as predicting the optimum tensile properties with respect to the printing parameters.
Miura-origami pattern has taken interest of many engineers and mathematicians due to its unique foldability and wide range of engineering applications. However, its mechanical behavior is yet to be fully explored, especially when it is made by additive manufacturing (3D printing) method. In this paper, the compressive behavior of 3D printed column structure using the Miura-origami pattern is investigated. Polylactic Acid (PLA) material was used to make the specimen with various printing parameters, i.e. infill pattern and density. Moreover, six kind of origami patterns with different folding angle and wall thicknesses were tested. Finally, the elastic and plastic deformation behavior under compressive load is examined. The result is useful to develop a finite element model which can be utilized to comprehensively explore the mechanical behavior under complicated loading condition. In addition, this study is expected to give impact on developing an innovative engineering design by the use of Miura-Ori pattern, for example is on designing an energy absorption device such as prosthetic leg and automotive crash box.
This paper presents the finite element analysis (FEA) of 3D printed Miura origami column under uniaxial compressive loading condition. The finite element model (FEM) was developed under elastic-perfectly plastic material model. Investigation on the yield strength and compressive modulus with two varied parameters, i.e. angle and thickness of the Miura origami column was conducted. Abaqus 6.14 software was used to conduct the simulation of compression test. The simulation result is then compared with and examined to the referred experimental data. From the simulation, it was revealed that the results from FEA of Miura-ori column with θ = 90° and t = 2 mm showed good agreement with the referred experimental data. However, FEA results mostly overestimates the mechanical properties. This discrepancy could be due to the existence of imperfections and anisotropic material of 3D printed structures.
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