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

Hao Li (Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China)
Shuai Zhang (Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China)
Zhiran Yi (Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China)
Jie Li (School of Materials Science and Engineering, Shanghai University, Zhabei District, Shanghai, China)
Aihua Sun (Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China)
Jianjun Guo (Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China)
Gaojie Xu (Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China)

Rapid Prototyping Journal

ISSN: 1355-2546

Article publication date: 17 October 2017

1010

Abstract

Purpose

This work aims to evaluate the influence of rheological properties of building materials on the bonding quality and ultimate tensile strength in the fused deposition modeling (FDM) process, through the investigation of parts printed by semi-crystalline and amorphous resins. Little information is currently available about the influence of the crystalline nature on FDM-printed part quality.

Design/methodology/approach

Semi-crystalline polyamide 12 and amorphous acrylonitrile butadiene styrene (ABS) were used to assess the influence of rheological properties on bonding quality and the tensile strength, by varying three important process parameters: materials, liquefier temperature and raster orientation. A fractography of both tensile and freeze-fractured samples was also investigated.

Findings

The rheological properties, mainly the melt viscosity, were found to have a significant influence on the bonding quality of fused filaments. Better bonding quality and higher tensile strength of FDM parts printed with semi-crystalline PA12, as compared with amorphous ABS, are suggested to be a result of higher initial sintering rates owing to the lower melt viscosity of PA12 at low shear rates. Near-full dense PA12 parts were obtained by FDM.

Originality/value

This project provides a variety of data and insight regarding the effect of materials properties on the mechanical performance of FDM-printed parts. The results showed that FDM technique allows the production of PA12 parts with adequate mechanical performance, overcoming the greatest limitation of a dependence on amorphous thermoplastics as a feedstock for the production of prototypes.

Keywords

Acknowledgements

This program is supported by the National Natural Science Foundation of China (No. 11574331), Ningbo Science & Technology Bureau (No. 2015A610017 & 2015B11002) and Zhejiang Key R & D program (No. 2015C01SA330002).

Citation

Li, H., Zhang, S., Yi, Z., Li, J., Sun, A., Guo, J. and Xu, G. (2017), "Bonding quality and fracture analysis of polyamide 12 parts fabricated by fused deposition modeling", Rapid Prototyping Journal, Vol. 23 No. 6, pp. 973-982. https://doi.org/10.1108/RPJ-03-2016-0033

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited

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