Homogenisation of elastic properties in FDM components using microscale RVE numerical analysis
- 34 Downloads
Fused deposition modelling (FDM) is an additive manufacturing method having the potential to fabricate functional components. As the inherent nature of additive structures, the component stiffness depends on the build parameters such as layer height and raster orientation in addition to the filament material properties. Even on FDM prints with 100% infill density, voids are formed along the interface of rasters and contribute to the characteristics of the component. The primary role of the present work is to determine elastic characteristics such as Young’s modulus, shear modulus and Poisson’s ratio of FDM components and study the effect of build parameters. The void geometry identified from the cross-sectional morphology was used to create a microscale representative volume element (RVE) model capturing the characteristics of the FDM print. The elastic constants of the microscale model RVE were estimated by volume average method and homogenised over the entire structure. The study also investigated the influence of layer height on the elastic behaviour of FDM components in two different raster orientations of 0° and 0°/90°. Both the conditions exhibited directional characteristics and the elasticity constants approaches filament characteristics with decreases in the layer height. The modulus of elasticity was found maximum in the direction of raster orientation, whereas the elasticity modulus along vertical direction exhibited the lowest. The components with 0°–90° raster orientation exhibited transversely isotropic characteristics. Thus, the actual cross-sectional morphology-based microscale numerical analysis can effectively predict the directional attributes of FDM prints.
KeywordsFDM Microscale numerical analysis Cross-sectional morphology RVE homogenisation Orthotropic property
- 15.Cazón A, Prada JG, García E, Larraona GS, Ausejo S (2015) Pilot study describing the design process of an oil sump for a competition vehicle by combining additive manufacturing and carbon fibre layers. Virtual Phys Prototyp 10:149–162. https://doi.org/10.1080/17452759.2015.1076240 CrossRefGoogle Scholar
- 23.Schmitz DP, Ecco LG, Dul S, Pereira ECL, Soares BG, Barra GMO, Pegoretti A (2018) Electromagnetic interference shielding effectiveness of ABS carbon-based composites manufactured via fused deposition modelling. Mater Today Commun 15:70–80. https://doi.org/10.1016/j.mtcomm.2018.02.034 CrossRefGoogle Scholar
- 37.Chacón JM, Caminero MA, García-Plaza E, Núñez PJ (2017) Additive manufacturing of PLA structures using fused deposition modelling: Effect of process parameters on mechanical properties and their optimal selection. Mater Des 124:143–157. https://doi.org/10.1016/j.matdes.2017.03.065 CrossRefGoogle Scholar
- 52.Barbero EJ (2011) Finite element analysis of composite materials. CRC Press, Boca RatonGoogle Scholar