Bonding quality and fracture analysis of polyamide 12 parts fabricated by fused deposition modeling

Li, Hao; Zhang, Shuai; Yi, Zhiran; Li, Jie; Sun, Aihua; Guo, Jianjun; Xu, Gaojie

doi:10.1108/rpj-03-2016-0033

Cited by 54 publications

(36 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As melt viscosity of polymer filaments exhibits essential effects on the feeding performance, the dimensional accuracy and bond quality between adjacent filaments in FDM parts, apparent melt viscosities (η ap ) of various PLA filaments were investigated here. As shown in Figure (a), the relationship between η ap and shear rate was nonlinear for three types of PLA materials, suggesting a typical shear‐thinning non‐Newtonian fluid behavior.…”

Section: Resultsmentioning

confidence: 89%

“…The layer‐to‐layer bond interface often cannot be comparable to bulk materials, since the thermal energy and time provided by the FDM process does not allow for the formation of sufficient diffusion thickness and entanglement at the interface . As a result, 90° specimens tend to facture at those weak bond interfaces (proved by the fracture morphology in Figure S2) and are used as a criteria for the interlayer bond strength of FDM parts . Based on the results in Figure (b) and Table , FDM parts with neat PLA as feedstock material exhibit the weakest interlayer bond strength (which is only 25.7 MPa), and fillers such as talc and carbon fibers can improve the interlayer bond strength to different extents, ranging from 52.6 MPa for PLA/talc to 30.4 MPa for PLA/ CF .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical properties of 3D parts fabricated by fused deposition modeling: Effect of various fillers in polylactide

Gao

Zhang

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

Weak mechanical strength and serious mechanical anisotropy are two key limiting factors for three‐dimensional (3D) parts prepared by fused deposition modeling (FDM) in industrial applications. In this work, we investigated the relationships between mechanical properties and surface quality of FDM parts with the properties of materials used. Three kinds of polylactide (PLA) filaments, composed of the same PLA matrix but different fillers (carbon fibers and talc), were used to prepare FDM specimens. Due to the nature of FDM process, FDM parts exhibited tensile properties weaker and more anisotropic than their injection‐molding counterparts. The presence of fillers affected the tensile properties of FDM parts, especially the degree of mechanical anisotropy. It is found that the interlayer bond governing the mechanical performance of FDM parts was improved since the fillers added in the polymer materials facilitates the molecular diffusion across the bond interface. Also, the surface quality of FDM parts varied with fillers. Neat PLA parts exhibited surface quality superior to the 3D parts printed with composites filaments. This work is believed to provide highlights on the development of polymer composites filament and improvement of mechanical properties of FDM parts. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47824.

show abstract

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Mechanical properties of 3D parts fabricated by fused deposition modeling: Effect of various fillers in polylactide

Gao

Zhang

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…After that, the printing platform moves downwards in the axial direction by one layer, and then the next layer of material is constructed. A solid model or part is stacked layer by layer from bottom to top [7,8].…”

Section: Introductionmentioning

confidence: 99%

PA12 Powder Recycled from SLS for FDM

Wang

Wei

2019

Polymers

View full text Add to dashboard Cite

In this study, Polyamide 12 (PA12) powder recycled after selective laser sintering (SLS) was made into filaments for fused deposition modelling (FDM). Compared with fresh PA12, the melt flow rate (MFR) of the recycled PA12 powder decreased by 77%, but the mechanical properties were only slightly reduced. In FDM, the printing speed and building orientation were changed, and the performance of the printed parts was tested. If the printing speed is too fast or too slow, the mechanical properties of the parts will be affected, and there is an optimal speed range. The tensile strength, flexural modulus, and impact strength of a printed test sample made from recycled powder reached 95%, 85%, and 87% of an x-direction test sample made from fresh PA12, respectively. For test samples printed from different orientations, the mechanical properties of the test samples printed in the x-direction were the best, while the crystallization performance was the opposite. Scanning electron microscope (SEM) images show that the printed test sample had good compactness and mechanical properties, and the delamination phenomenon was basically not observed.

show abstract

“…Usually, amorphous polymers are widely used with FFF due to their low shrinkage while solidification. However, different available FFF-printable materials have different characteristics like ABS is an amorphous polymer, PLA without any filler behaves like an amorphous material, but with tricalcium phosphate behaves like a semi-crystalline polymer, 96 polybutylene terephthalate, polyamide 12 (PA 12), PEEK are semi-crystalline [97][98][99] in nature. The effects of different reinforcement on these polymers in terms of viscoelasticity, printing quality, and shrinkage while solidification are worth investigating.…”

Section: Bond Formation Crystallization and Bead-bondingmentioning

confidence: 99%

Review on process model, structure-property relationship of composites and future needs in fused filament fabrication

Papon

Haque

2020

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

This paper presents the state-of-the-art of additive manufacturing of composites for processing functional, load-bearing components. A general overview of different additive manufacturing methods is provided, and specific attention is focused on fused filament fabrication-based composites processing. Different process modeling strategies are summarized, and key aspects of these models are discussed. Significant results such as thermal and fluid flow characteristics, effects of nozzle geometry on melt flow, fiber orientation, bead spreading, and solidification, the formation of residual stresses, and deformation behavior are discussed from computational modeling perspective. The scientific advancement, model limitations, and future modeling needs are prescribed reviewing the current works. A general overview of material development in nano-micro-macro-scale reinforcement is also presented. Different length-scales of reinforcement has its own challenges and promises. The continuous fiber reinforcement has a great potential for being the next-generation composites manufacturing technology. However, the challenges in reducing the void content, better bonding between the fiber–matrix, and layer-layer adhesion, and process uncertainty are some of the key areas yet to advance. Based on the current limitations on computational modeling, materials development, and process modeling studies, future research needs and recommendations are provided.

show abstract

Bonding quality and fracture analysis of polyamide 12 parts fabricated by fused deposition modeling

Cited by 54 publications

References 33 publications

Mechanical properties of 3D parts fabricated by fused deposition modeling: Effect of various fillers in polylactide

Mechanical properties of 3D parts fabricated by fused deposition modeling: Effect of various fillers in polylactide

PA12 Powder Recycled from SLS for FDM

Review on process model, structure-property relationship of composites and future needs in fused filament fabrication

Contact Info

Product

Resources

About