AccScience Publishing / MSAM / Volume 2 / Issue 3 / DOI: 10.36922/msam.1603
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ORIGINAL RESEARCH ARTICLE

Modeling and experimental investigation of fiber orientation in cast and 3D-printed cementitious composites

Mingyang Li1 ,  Dong Zhang2 ,  Teck Neng Wong1 ,  Ming Jen Tan1 ,  Yiwei Weng3*
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1 Singapore Centre for 3D Printing, Nanyang Technological University, Singapore
2 Sustainable and Innovation Bridge Engineering Research Centre, College of Civil Engineering, Fuzhou University, China
3 Department of Building and Real Estate, The Hong Kong Polytechnic University, Hong Kong, China
MSAM 2023, 2(3), 1603 https://doi.org/10.36922/msam.1603
Submitted: 15 August 2023 | Accepted: 9 September 2023 | Published: 22 September 2023
© 2023 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

Fiber orientation is process-related and has significant impacts on material performance. However, existing studies only consider the impact of individual factors on the fiber orientation, either boundary impacts or flow field impacts. This work aims to study fiber orientation by considering the combined impact of these two factors. Analytical models were first constructed, which revealed that when the flow of material is negligible, fiber orientation is impacted by the boundary conditions. When the flow field is non-negligible, fiber orientation is affected by the direction of flow streamlines. Specimens were then prepared using fluorescence image processing and μ-computed tomography scanning for fiber orientation analysis. The results indicate that fiber orientation could be controlled by varying boundary constraints and flow fields. Mechanical results reveal that when the designed condition achieves directional-orientated fibers, the mechanical property of specimens could be enhanced with the applied stress direction being the same as the fiber orientation. This work provides a novel insight to tailor fiber-reinforced cementitious material properties by designing the boundary constraints and flow fields in the cast and printing processes.

Keywords
Additive manufacturing
Fiber orientation
Flow field
Boundary constraint
Mechanical property
Funding
The authors would like to acknowledge the Hong Kong Polytechnic University (P0044561), the National Research Foundation, Prime Minister’s Office, Singapore, under its Medium-Sized Centre funding scheme, CES_SDC Pte Ltd, and Chip Eng Seng Corporation Ltd. for their funding and support in this research project.
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Conflict of interest
The authors declare no conflicts of interest.
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Materials Science in Additive Manufacturing, Electronic ISSN: 2810-9635 Published by AccScience Publishing
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