A study on the effects of internal architecture on the mechanical properties and mixed-mode fracture behavior of 3D printed CaCO₃/ABS nanocomposite samples

Abstract

Purpose The purpose of this study was to investigate the effects of CaCO3 nanoparticles on the mechanical properties, and mixed-mode fracture behavior of acrylonitrile butadiene styrene 3D printed samples with different internal architectures. Design/methodology/approach The nanocomposite filaments have been fabricated by a melt-blending technique. The standard tensile, compact tension and special fracture test samples, named Arcan specimens, have been printed at constant extrusion parameters and at four different internal patterns. A special fixture was used to carry out the mixed-mode fracture tests of Arcan samples. Finite element analyses using the J-integral method were performed to calculate the fracture toughness of such samples. The fractographic observations were used to evaluate the mechanism of fracture at different concentrations of nanoparticles. Findings The addition of CaCO3 nanoparticles has resulted in a significant increase in the fracture loading of the samples, although this increase was not consistent for all the filling patterns, being more significant for samples with linear and triangular structures. According to the fractographic observations, the creation of uniformly distributed microvoids due to the blunting effect of nanoparticles and 3D stress state at the crack tip in the samples with linear and triangular structures justify the enhancement in the fracture loading by the addition of CaCO3 nanoparticles in the matrix. Originality/value There is a significant gap in the knowledge of the effects of different nanoparticles in the polymer samples produced by the fused filament fabrication process. One of such nanoparticles is an inorganic CaCO3 nanoparticle that has been frequently used as nanofillers to improve the thermomechanical properties of thermoplastic polymers. Here, experimental and numerical studies have been conducted to investigate the effects of such nanoadditives on the mechanical and fracture behavior of 3D printed samples.

Lattice optimization of fiber-reinforced polymer parts fabricated by additive manufacturing: the impact of Bezier curve order on mechanical properties

“…In composite materials, fiber orientation and density play a key role in determining their mechanical properties (Ahmad et al. , 2022; Seyedzavvar and Boğa, 2023). During the printing process of AM, short fibers respond to shear stress by aligning along the printing direction throughout the newly formed parts, this phenomenon is seen with both polymer (Yunus et al.…”

“…On another front composite materials have gained ground thanks to their superior properties formed by combing certain proportions. In composite materials, fiber orientation and density play a key role in determining their mechanical properties (Ahmad et al, 2022;Seyedzavvar and Bo ga, 2023). During the printing process of AM, short fibers respond to shear stress by aligning along the printing direction throughout the newly formed parts, this phenomenon is seen with both polymer (Yunus et al, 2016;Kaur et al, 2017) and ceramic (Yunus et al, 2017) matrix composites.…”

A hybrid ANN/PSO optimization of material composition and process parameters for enhancement of mechanical characteristics of 3D-printed sample

“…Furthermore, the authors stated that the presence of CFs increases the mechanical strength of specimens, provided that the fibers are orientated along the direction of maximum principal stresses under any specific loading condition. Seyedzavvar and Bo ga (2022) investigated the effects of CaCO 3 nanoadditives on fracture resistance of 3D-printed ABS samples under various modes of loading. The authors reported that the effects of nanoadditives on the fracture toughness of fabricated samples depend on the type of PP in FFF process, being higher for the specimens of linear architecture than that of other PPs.…”

3D Printing Using Ti-Al Nanopowders: Mechanisms of Structure Formation

“…Then, the binder is removed by chemical, thermal or thermochemical treatment, and the fabricated workpiece is subjected to conventional sintering in a vacuum furnace [32]. In [33], Seyedzavvar M. and Bo ga C. demonstrated the successful use of an acrylonitrile-butadiene-styrene binder filled with CaCO 3 nanoparticles as a feedstock for obtaining samples by the method of extrusion additive technologies. The addition of nanoparticles led to a significant increase in the tensile strength of the obtained samples.…”