Abstract
Three-dimensional (3D)-printed parts are an essential subcategory of additive manufacturing with the recent proliferation of research in this area. However, 3D-printed parts fabricated by different techniques differ in terms of microstructure and material properties. Catastrophic failures often occur due to unstable crack propagations and therefore a study of fracture behavior of 3D-printed components is a vital component of engineering design. In this paper, experimental tests and numerical studies of fracture modes are presented. A series of experiments were performed on 3D-printed nylon samples made by fused deposition modeling (FDM) and multi-jet fusion (MJF) to determine the load-carrying capacity of U-notched plates fabricated by two different 3D printing techniques. The equivalent material concept (EMC) was used in conjunction with the J-integral failure criterion to investigate the failure of the notched samples. Numerical simulations indicated that when EMC was combined with the J-integral criterion the experimental results could be predicted successfully for the 3D-printed polymer samples.
Highlights
Three-dimensional printing (3D) has increasingly become one of the prevalent manufacturing methods for the development of tools and functional parts, in the sectors entailing extensive customization, such as medical and aerospace [1,2,3]
3D-printed parts fabricated by different techniques differ in terms of strength, stiffness, microstructure and material properties, so that it is necessary to investigate their behaviors through both experimental tests and finite element analysis (FEA) [6,7,8,9,10]
The parts fabricated by different techniques differ in terms of strength, stiffness, microstructure and material properties
Summary
Three-dimensional printing (3D) has increasingly become one of the prevalent manufacturing methods for the development of tools and functional parts, in the sectors entailing extensive customization, such as medical and aerospace [1,2,3]. Catastrophic failures often occur due to unstable crack propagations and study of fracture of components is a vital component of engineering design In this respect, to address the fracture behavior of 3D-printed. Polymers 2020, 12, 302 plastic components we used FDM and MJF techniques to manufacture notched samples and supported the experimental observations with a failure model. The line ahead of the crack tip has the mixed mode I/II stress intensity factors In these studies, the finite fracture theory was employed to investigate the fracture of rounded-tip notched samples with various notch radii and inclination angles under tensile loading. 3D-printed rectangular nylon samples made by FDM and MJF under mode I and mixed mode I/II loading regimes within the framework of combined EMC and J-integral criterions.
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