ROBOTICA & MANAGEMENT - Vol. 25, No. 2, December 2020, pp. 4-11

Influence of Rectilinear Infill Parameters on Stress State of Mechanical Structures Components

Vasile Cojocaru, Calin-Octavian Miclosina *

Babeș-Bolyai University, Faculty of Engineering
Traian Vuia Square, No. 1-4, Reșița, România
* Corresponding author. E-mail: calin.miclosina@ubbcluj.ro

Abstract:The use of additive manufacturing to produce mechanical components with internal infill lattice leads to material savings, decrease of weight and decrease of inertial loads. The correlation of the infill parameters with the mechanical behavior of the parts is intensively studied nowadays. This paper presents a numerical analysis of the influence of rectilinear infill lattice parameters on the maximum stress in bending of a cantilever beam. The infill lattice parameters analyzed in the paper were the distance between two successive lattice walls and the thickness of the wall. Two cases of loading are analyzed: a) bending generated by a force applied on the extrusion direction of the infill and b) bending generated by a force applied perpendicular to the extrusion direction of the infill. In both cases, it was shown that the maximum stress decrease with the decrease of the distance between the walls. Furthermore, the maximum stresses increase with the decrease of the wall thickness. For samples with identical volumes (same material consumption), lower stresses are obtained for the samples with a smaller distance between the walls and a smaller wall thickness compared to the samples with higher distance between the walls and higher wall thickness (at the same material consumption, a denser infill lattice has a superior flexural behavior).

Keywords: rectilinear infill, bending, FEM, stress.

Full Text

References

[1] Abdullah A.M., Mohamad D., Rahim T., Akil H.M., Rajion Z.A.: “Effect of narrow infill density gap on the compressive properties of 3D printed carbon fiber reinforced acrylonitrile butadiene styrene”, Journal of Mechanical Science and Technology, Vol. 33, No. 5, p. 2339-2343, 2019.

[2] Bartolai J., Wilson-Heid A., Kruse J., Beese A., Simpson T.: “Full Field Strain Measurement of Material Extrusion Additive Manufacturing Parts with Solid and Sparse Infill Geometries”, JOM, Vol. 71, No. 3, p. 871-879, 2019.

[3] Clausen A., Andreassen E., Sigmund O.: “Topology optimization of 3D shell structures with porous infill”, Acta Mechanica Sinica, Vol. 33 (4), p. 778-791, 2017.

[4] Cojocaru V.: “Influence of Rectilinear Infill Parameters on Mechanical Behavior of 3D Printed Parts – A FEM Approach”, Robotica & Management, vol. 24-2, p. 4-7, 2019.

[5] Cojocaru V., Korka Z.O., Miclosina C.-O.: “Influence of the Mesh Parameters on Stresses and Strains in FEM Analysis of a Gear Housing”, Analele Universitatii "Eftimie Murgu" Resita, Fascicula Inginerie, vol. XX, no. 2, p. 47-52, 2013.

[6] Cwicla G., Grabowik C., Kalinowski K., Paprocka I., Ociepka P.: “The influence of printing parameters on selected mechanical properties of FDM/FFF 3D-printed parts”, IOP Conf. Series: Materials Science and Engineering, 227, 2017.

[7] Dezaki M.L., Ariffin M.K.A.M.: “The Effects of Combined Infill Patterns on Mechanical Properties in FDM Process”, Polymers, vol. 12, 2020.

[8] Dudescu C., Racz L.: “Effects of raster orientation, infill rate and infill pattern on the mechanical properties of 3D printed materials”, Acta Universitatis Cibiniensis – Technical Series, vol. LXIX, pp. 23-30, 2017.

[9] Fu J., Li H., Xiao M., Gao L., Chu S.: “Topology optimization of shell-infill structures using a distance regularized parametric level-set method”, Structural and Multidisciplinary Optimization, Vol. 59, p. 249-262, 2019.

[10] Gopsill J., Shindler J., Hicks B.: “Using finite element analysis to influence the infill design of fused deposition modelled parts”, Progress in Additive Manufacturing, Vol. 3, p. 145-163, 2018.

[11] Groen J., Wu J., Sigmund O.: “Homogenization-based stiffness optimization and projection of 2D coated structures with orthotropic infill”, Computer Methods in Applied Mechanics and Engineering, Vol. 349, p. 722-742, 2019.

[12] Kain S., Ecker J.V., Haider A, Musso M., Petutschnigg A.: “Effects of the infill pattern on mechanical properties of fused layer modeling (FLM) 3D printed wood/polylactic acid (PLA) composites”, European Journal of Wood and Wood Products, article online first, 2019.

[13] Khan S.A., Siddiqui B.A., Fahad M., Khan M.A.: “Evaluation of the Effect of Infill Pattern on Mechanical Strength of Additively Manufactured Specimen”, Materials Science Forum, vol. 887, pp 128-132, 2017.

[14] Lee T., Lee J., Lee K.: “Extended block based infill generation”, The International Journal of Advanced Manufacturing Technology, Vol. 93, p. 1415-1430, 2017.

[15] Lubombo C., Huneault M.: “Effect of infill patterns on the mechanical performance of lightweight 3D printed cellular PLA parts”, Materials Today Communications, Vol. 17, p. 214-228, 2018.

[16] Miclosina C.-O., Campian C.V., Frunzăverde D., Cojocaru V.: “Analysis of an Outer Bearing Bush of a Hydropower Plant Kaplan Turbine Using Finite Element Method”, Recent Researches in Environment, Energy Planning and Pollution, Proceedings of the 5th WSEAS International Conference on Renewable Energy Sources (RES'11), Iași, 2011.

[17] Nedelcu D., Cojocaru V., Micu L.M., Florea D., Hluscu M.: “Using of Polymers for Rapid Prototyping of an Axial Microturbine Runner and Wicked Gates”, Materiale Plastice, Vol. 56, no. 2, p. 454-459, 2019.

[18] Ngo T.D., Kashani A., Imbalzano G., Nguyen K.T.Q., Hui D.: “Additive manufacturing (3D printing): a review of materials, methods, applications and challenges”, Composite Part B: Engineering, volume 143, pp. 172–196, 2018.

[19] Rismalia M., Hidajat S.C., Permana I.G.R., Hadisujoto B., Muslimin M, Triawan F., “Infill pattern and density effects on the tensile properties of 3D printed PLA material”, Journal of Physics: Conference Series, 2019.

[20] Rodriguez-Panes A., Claver J., Camacho A.M.: “The Influence of Manufacturing Parameters on the Mechanical Behaviour of PLA and ABS Pieces Manufactured by FDM: A Comparative Analysis”, Materials, vol. 11, 2018.

[21] Samykano M., Selvamani S. K., Kadirgama K., Ngui W. K., Kanagaraj G., Sudhakar K.: “Mechanical property of FDM printed ABS: influence of printing parameters”, The International Journal of Advanced Manufacturing Technology, Vol. 102, p. 2779-2796, 2019.

[22] Tanveer Q., Haleem A., Suhaib M.: “Effect of variable infill density on mechanical behaviour of 3‑D printed PLA specimen: an experimental investigation”, SN Applied Sciences, online first, 2019.

[23] Tassi G.M., Gao Q., Diaz R.: “Infill Analysis and Optimization in Additive Manufacturing Applications”, EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization, p. 593-604, 2019.

[24] Wadbro E., Niu B.: “Multiscale design for additive manufactured structures with solid coating and periodic infill pattern”, Computer Methods in Applied Mechanics and Engineering, Vol. 357, 112605, 2019.

[25] Wu J., Clausen A., Sigmund O.: “Minimum compliance topology optimization of shell–infill composites for additive manufacturing”, Computer Methods in Applied Mechanics and Engineering, Vol. 326, p. 358-375, 2017.