Effect of 3D-Printing and Compression Molding on Anisotropy of Acrylonitrile Butadiene Styrene Micro Specimen: A Comparative Study Based on Digital Image Correlation

Document Type : Research Article

Authors

1 School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran

2 School of Mechanical Engineering, College of Engineering, University of Tehran, Iran

3 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

Abstract

This paper aims to calculate and compare normal anisotropy coefficients in 3D-printed and hot-compression molded micro acrylonitrile butadiene styrene specimens. To achieve this goal, micro specimens of additively-printed and compression-molded acrylonitrile butadiene styrene were fabricated and tested using a micro-tensile testing apparatus integrated with an optical microscope while deformation of the specimens was recorded by a camera. Frames from this video were selected and strain distribution on a micron-sized area of interest was obtained using digital image correlation analysis. It was shown that there exists a close agreement between digital image correlation results and in situ optical observations. The plastic anisotropy coefficients (R-values) were then calculated from the surface strains as a function of the applied strain. For this purpose, a through-thickness strain component was obtained assuming plastic incompressibility condition. Results showed that both micro samples revealed an anisotropic response during plastic deformation. At low plastic strains, the printed micro specimen exhibits a more anisotropic behavior than the monolithic micro specimen. As the deformation proceeds, the normal anisotropy coefficient increases for the additively-manufactured micro specimen and decreases for the hot-pressed micro specimen. 

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 12
March 2022
Pages 5645-5658

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