Evaluation of Effect of Sample Size and Layer Direction on Mechanical Property of Specimen Manufactured by FDM-Type 3D Printer

Abstract:

In the present study, we investigate the effect of the sample size and layer direction on mechanical properties of the specimen fabricated by the FDM-type 3D printer under 4-point bending test. Acrylonitrile-butadiene-styrene (ABS) was employed as a source material. Bending tests were performed under several experimental conditions of layer direction, dimension of the specimens and supporting distance. The relationship between bending load and displacement depended strongly on the layer direction. Young’s modulus increased with increasing supporting distance, particularly, when the filaments were parallel to the loading direction. The strain distribution during the bending test was evaluated by DIC. When the supporting distance was short, strain distribution obtained from DIC became different from the theoretical distribution. This result indicated that the prominent shear deformation occurs in the bending of the printed material when the supporting distance is short. Subsequently, FEM analysis was performed to remove the error in the estimation of Young’s modulus due to the shear deformation, and the correcting equation was proposed.

• Periodical: Key Engineering Materials (Volume 794)
• Pages: 324-332
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.794.324
• Online since: February 2019
• Authors: Hiroyuki Akiyama*, Makoto Uchida, Yoshihisa Kaneko
• Keywords: 3D Printer, 4-Point Bending Test, ABS, Digital Image Correlation, FDM, Finite Element Method (FEM), Young’s Modulus

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