Characterization of residual stress and deformation in additively manufactured ABS polymer and composite specimens

Residual stresses induced in the layer-by-layer fabrication process of additively manufactured parts have significant impact on their mechanical properties and dimensional accuracy. This work aims to characterize the residual stress and deformation in specimens based on unreinforced acrylonitrile-bu...

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Bibliographic Details
Published in:Composites science and technology 2017-09, Vol.150, p.102-110
Main Authors: Zhang, Wei, Wu, Amanda S., Sun, Jessica, Quan, Zhenzhen, Gu, Bohong, Sun, Baozhong, Cotton, Chase, Heider, Dirk, Chou, Tsu-Wei
Format: Article
Language:English
Subjects:
ABS resins
Additive manufacturing
Butadiene
Carbon fiber reinforced plastics
Carbon fiber reinforcement
Carbon nanotubes
Computed tomography
Deformation
Digital imaging
Fiber reinforced polymers
Heat treatment
MATERIALS SCIENCE
Mechanical properties
Microstructure
Polymers
Porosity
Printing
Process parameters
Processing parameters
Raster
Residual stress
Shrinkage
Studies
Tomography
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Summary:Residual stresses induced in the layer-by-layer fabrication process of additively manufactured parts have significant impact on their mechanical properties and dimensional accuracy. This work aims to characterize the residual stress and deformation in specimens based on unreinforced acrylonitrile-butadiene-styrene (ABS), carbon nanotube reinforced ABS and short carbon fiber reinforced ABS. The shrinkage and displacement fields were obtained, respectively, by thermal treatment as well as Digital Image Correlation observation of specimens before and after sectioning. The microstructure and porosity of additively manufactured specimens were also examined using X-ray micro-computed tomography. Specimen shrinkage and porosity content were significantly influenced by the process parameters of raster angle and printing speed, as well as material types. Faster printing speed led to larger porosity and residual stress, as well as higher shrinkage after specimen thermal treatment. Raster angle had a greater influence on specimen shrinkage and porosity as comparing to printing speed. Composite printing wires based on carbon nanotube and short carbon fiber in ABS greatly reduced specimen shrinkage and deformation, while increased the porosity, especially for carbon fiber reinforced ABS specimens.
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2017.07.017