Abstract
Fused deposition modeling (FDM) is a capable technology based on a wide range of parameters. The goal of this study is to make a comparison between infill pattern and infill density generated by computer-aided design (CAD) and FDM. Grid, triangle, zigzag, and concentric patterns with various densities following the same structure of the FDM machine were designed by CAD software (CATIA V5®). Polylactic acid (PLA) material was assigned for both procedures. Surface roughness (SR) and tensile strength analysis were conducted to examine their effects on dog-bone samples. Also, a finite element analysis (FEA) was done on CAD specimens to find out the differences between printing and simulation processes. Results illustrated that CAD specimens had a better surface texture compared to the FDM machine while tensile tests showed patterns generated by FDM were stronger in terms of strength and stiffness. In this study, samples with concentric patterns had the lowest average SR (Ra) while zigzag was the worst with the value of 6.27 µm. Also, the highest strength was obtained for concentric and grid samples in both CAD and FDM procedures. These techniques can be useful in producing highly complex sandwich structures, bone scaffolds, and various combined patterns to achieve an optimal condition.
Highlights
The main main aim of this study is to address this research question and make a comparison beaim of this study is to address this research question and make a comparison between infill tween infill patterns with various densities generated by printer in dogpatterns with various densities generated by computer-aided design (CAD) and Fused deposition modeling (FDM) printer in dog-bone shape bone
Two techniques were used for producing polylactic acid (PLA) dog-bone samples
Namely grid, triangle, zigzag, and concentric were picked and designed in a CAD system with different densities. These pattern structures followed the same structure as FDM machine-printed patterns in various conditions
Summary
The most common and environment-friendly additive manufacturing (AM) process is fused deposition modeling (FDM) [1]. The FDM machines consist of various components that are integrated to build parts quickly without wasting material and tooling [4,5,6]. The process is started by designing and developing the model in computer-aided design (CAD) software packages. The prepared file must be changed into a readable format by FDM 3D printers. The usable format is known as standard triangle language (STL) and exclusive software packages are required to convert the CAD file into STL. The extruder melts the material at a specific temperature and deposits the molten material on the platform. The molten material solidifies quickly and sticks to the platform.
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