Effect of different parameters on the tensile properties of printed Polylactic acid samples by FDM: Experimental design tested with MDs simulation

Abstract

Fused Depositional Modeling (FDM) is one of the common methods for 3D printing of polymers, which is expanding in various industrial applications, scientific researches, and engineering applications due to its ability to make complex parts. In this research, molecular dynamics (MDs) simulation has been used to predict the physical and mechanical properties. Then, the mechanical properties of the printed parts are obtained. The mechanical properties of 3D printed parts strongly depend on the correct selection of processing parameters. In this study, the effect of three important parameters such as infill density, printing speed, and layer thickness are investigated on the tensile properties of PLA specimens. For this purpose, standard specimens with four infill densities of 20%, 40%, 60% and 80%, two speeds of 20 mm/s, and 40 mm/s, and two thicknesses of 0.1 mm and 0.2 mm are printed and tested under quasi-static tensile test. In all printed specimens, the print angle is ± 45°. The experimental results show that the infill density in comparison to the other two parameters has significant effect on mechanical properties such as modulus of elasticity, ultimate strength, and failure strain. According to these results, by increasing the infill density, the stiffness and strength of the specimens increases considerably. At infill density of 80%, the specimens has the highest stiffness and strength, but it exhibits a brittle behavior. Moreover, it can be deduced that by reducing the layer thickness although the modulus of elasticity increases a little, ductility is greatly affected.

Review on Process Parameters of FDM and Their Impact on Tensile Strength and Wear Resistance of Additive Manufacturing Specimen

“…Tensile Strength is maximum between 1to 1.8 mm LT and minimum at Z-direction of Carbon Fiber PLA. Carbon Fiber PLA has higher strength then PLA in X and Y direction [23] LT, ID, and PS PLA On increasing ID tensile strength increase and increase significantly. Samples behaves more brittle on increasing ID very high or reducing LT. ID of 40% is more suitable in terms of cost, material, and time savings…”

Structural and thermal analyses in semiconducting and metallic zigzag single-walled carbon nanotubes using molecular dynamics simulations

“…The thermal properties of materials play a critical role in determining their suitability for various applications, such as in aerospace, automotive, and biomedical engineering [19]. The unique properties of CNTs, including their high strength and stiffness, position them as promising candidates for the development of cutting-edge materials with enhanced mechanical characteristics [20]. For example, the length and diameter of CNTs can be tuned to optimize their sensitivity and selectivity for a specific analyte.…”

Vibrations of composite structures: Finite element and analytical investigation

“…[1][2][3][4][5] Due to the high weight resistance ratio and resistance to moisture and corrosion and other unique properties of composites, composite shells have gradually found their place in various industries. [6][7][8][9][10][11][12] Therefore, various analyzes of composite cylindrical shells are of special importance, and the stability and vibration analysis of these shells is one of the most important. [13][14][15][16] Therefore, vibrational analysis of these shells has been considered by many researchers.…”