Deposition Strategies and Resulting Part Stiffnesses in Fused Deposition Modeling

Abstract

In the Fused Deposition Modeling (FDM) process, the choice of deposition strategy plays an important role. In this paper, the effects of different deposition paths on this deposition based LM process are investigated. Some variations on the current deposition strategies are also proposed. The stiffness of parts manufactured by the different strategies is experimentally determined. It is then compared with an analytical model developed using laminate analysis. A good conformance of the laminate model to the experimental results suggests that the laminate model can be used as a design aide to help the designer tailor the deposition strategy to the stiffness requirements.

Mechanical Characterization of Additively Manufactured Parts by FE Modeling of Mesostructure

“…The right printing strategy and optimum process parameters improve the mechanical properties of the part [6]. The filling strategy affects the strength and stiffness of a part due to the extent of bonding within layer as well as between layers [7,8]. The mechanical properties of the printed part also depend on the bonding strength between the adjacent roads as well as adjacent layers.…”

“…The bond formation among the roads is driven by thermal energy of the extruded material [9]. Researchers [2][3][4][5][6][7][8][9][10][11][12][13] discussed the various process parameters of FDM such as raster orientation, air gap, bead width and temperature effect on the mechanical properties of the final fabricated part. The raster angle was observed to have more influence on the mechanical properties than other parameters.…”

“…The classical laminate theory for the analysis of FDM processed parts was initially implemented by Kulkarni and Dutta [7]. Ahn et al [26] employed analytical models of classical laminate theory and the Tsai-Wu failure criterion for laminate to investigate the failures in the FDM parts.…”

“…The elastic moduli for FDM processed layers (orthotropic material) are found experimentally by Casavola et al [27] and then classical laminate theory is employed to characterize the mechanical behavior of the FDM processed parts. So far, most studies [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] presented experimental work. However, there has been relatively little literature available on numerical modeling to find the elastic moduli of a material of the FDM processed part.…”

An assessment of data requirements and data transfer formats for layered manufacturing

“…Results showed that shorter scan vectors result in stronger parts. In [58] and [59], parts built by the FDM process were studied. The first of these papers compares the strength of parts made with raster and contour paths, and studies the effect of impregnating parts with five different epoxies and composite supplements in differing amounts.…”