Technical Brief

Dual-Notch Void Model to Explain the Anisotropic Strengths of 3D Printed Polymers

[+] Author and Article Information
L. Roy Xu

Department of Mechanical Engineering,
University of New Mexico,
Albuquerque, NM 87131
e-mail: luoyu.r.xu@gmail.com

Dominique Leguillon

Institut Jean Le Rond d’Alembert, CNRS UMR7190,
Sorbonne Université,
4 place Jussieu,
Paris 75005, France
e-mail: dominique.leguillon@upmc.fr

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received March 20, 2019; final manuscript received July 18, 2019; published online August 1, 2019. Assoc. Editor: Curt Bronkhorst.

J. Eng. Mater. Technol 142(1), (Aug 01, 2019) (4 pages) Paper No: MATS-19-1054; doi: 10.1115/1.4044282 History: Received March 20, 2019; Accepted July 18, 2019

Based on the unique additive manufacturing process, a dual-notch void model is proposed to explain three tensile strengths of a 3D printed polymer along three major directions. This model incorporates the strength/notch angle relation and provides a relative magnitude of three tensile strengths, i.e., Sx (axial strength) > Sy (transverse strength) ≥ Sz (inter-layer strength).

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Grahic Jump Location
Fig. 1

Cross-sectional views of the bond formation process between adjacent rasters, and an idealized defect forms between the rasters and printing surfaces (ω is the notch opening angle)

Grahic Jump Location
Fig. 2

Predicted normalized notch strength as a function of the notch opening angle ω. The dashed line and triangles represent large PMMA specimens (notch depth 10 mm), and the solid line and diamonds represent ABS specimens. Carpinteri's previous measured PMMA strengths are shown as circles. Sx, Sy, and Sz are only illustrations of three tensile strengths (relative not absolute values) of 3D printed materials related to different notch opening angles.

Grahic Jump Location
Fig. 3

Tensile experiments to measure the transverse/inter-layer strengths Sy and the Sz

Grahic Jump Location
Fig. 4

Measured three tensile strengths of a 3D printed PLA polymer [6]



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