Fatigue Performance of ABS Specimens Obtained by Fused Filament Fabrication

Abstract

In this paper, the fatigue response of fused filament fabrication (FFF) Acrylonitrile butadiene styrene (ABS) parts is studied. Different building parameters (layer height, nozzle diameter, infill density, and printing speed) were chosen to study their influence on the lifespan of cylindrical specimens according to a design of experiments (DOE) using the Taguchi methodology. The same DOE was applied on two different specimen sets using two different infill patterns—rectilinear and honeycomb. The results show that the infill density is the most important parameter for both of the studied patterns. The specimens manufactured with the honeycomb pattern show longer lifespans. The best parameter set associated to that infill was chosen for a second experimental phase, in which the specimens were tested under different maximum bending stresses so as to construct the Wöhler curve associated with this 3D printing configuration. The results of this study are useful to design and manufacture ABS end-use parts that are expected to work under oscillating periodic loads.

Post-Process Effects of Isothermal Annealing and Initially Applied Static Uniaxial Loading on the Ultimate Tensile Strength of Fused Filament Fabrication Parts

“…These parts are weaker in comparison with parts fabricated using traditional techniques like injection molding at the inter-laminar region and fail prematurely at such interfaces, thus dominating the overall strength of the parts. This failure at the inter-laminar region has been studied for a wide range of testing conditions including tension [15], compression [16,17], torsion [18], and fatigue [19][20][21]. These studies reinforce the understanding that this premature failure is influenced by the inter-laminar bonding.…”

Design and FDM/FFF Implementation of a Compact Omnidirectional Wheel for a Mobile Robot and Assessment of ABS and PLA Printing Materials

“…The proposed omnidirectional wheel design has been applied to develop a basic implementation of a compact and portable mobile robot. Future works will be focused on the development of a compact educational mobile robot, in the evaluation of the lifespan of the omnidirectional wheels implemented with tough PLA [7], and in the assessment of other thermoplastic filaments [31].…”

“…All these expected properties can be affected by the design of the piece and the parameters of the 3D printing process [14,15] and will be empirically verified. The deformation tests will compare the mechanical properties [7,14] of T-structures 3D printed in ABS and PLA 3D805 depending on the printing orientation, the infill density (30% and 100% or solid) and the width of the T-structure (2 and 4 mm). In this paper the term vertical printing orientation means that the T-structure has been printed with the axes perpendicular to the build surface (see Figures 7 and 8a) and the term horizontal printing orientation means that the T-structure has the axes parallel to the build surface (see Figures 7 and 8b).…”

“…The main 3D printing parameters are: part orientation, layer height, wall thickness, nozzle diameter, infill type, infill orientation, infill percentage and printing speed. For example, part orientation (placement of the part referred to the X, Y and Z axes of the 3D printer) affects the surface roughness, dimensional accuracy and mechanical strength of the part [6], the configuration of the infill also affects the lifespan of the part [7].…”

“…The use of these materials in 3D printers has been widely discussed in the scientific literature. Domingo et al [7] proved that the honeycomb infill has better lifespan than the linear infill when using ABS as a printing material. Rajpurohit et al [9][10][11] proposed the analysis of the effects of the printing parameters on the tensile and flexural strength of FDM and FFF PLA parts.…”