Characterization of the Non-Isotropic Tensile and Fracture Behavior of Unidirectional Polylactic Acid Parts Manufactured by Material Extrusion

23 Pages Posted: 25 Oct 2022

See all articles by Olivier Lampron

Olivier Lampron

affiliation not provided to SSRN

Alessandra Lingua

affiliation not provided to SSRN

Daniel Therriault

Polytechnique Montréal - Laboratory for Multiscale Mechanics (LM2)

Martin Levesque

affiliation not provided to SSRN

Abstract

This study presents a comprehensive characterization of the fracture and tensile behavior of unidirectional polylactic acid (PLA) parts manufactured by material extrusion (MEX). The effect of the crack tip to filament orientation angle on the fracture behavior was investigated through three-point bending on single-edge notch bending (SENB) specimens printed at seven different build angles. The fracture test results show a brittle behavior for inter-layer fracture and a more ductile behavior for cross-layer crack propagation. Specimens with a 20° build angle required the most energy for the crack to extend completely, exhibiting mixed cross- and inter-layer crack propagation. The elastic properties and the ultimate strength distribution were measured through tensile tests on dogbone specimens printed at five different build angles. The experimental stiffness and strength distributions show good agreement with the orthotropic material model and the Tsai-Hill strength criterion, with a maximum model error of ≈ 10%. The printed mesostructures and the fracture surfaces were observed with scanning electron microscopy (SEM). Finally, differential scanning calorimetry (DSC) was used to evaluate the level of crystallinity in the printed structures. The resulting data allows the development of fracture models able to capture the complete failure behavior of MEX fabricated parts.

Keywords: FFF, Fracture toughness, Tensile strength, Elastic properties, DIC

Suggested Citation

Lampron, Olivier and Lingua, Alessandra and Therriault, Daniel and Levesque, Martin, Characterization of the Non-Isotropic Tensile and Fracture Behavior of Unidirectional Polylactic Acid Parts Manufactured by Material Extrusion. Available at SSRN: https://ssrn.com/abstract=4258386 or http://dx.doi.org/10.2139/ssrn.4258386

Olivier Lampron (Contact Author)

affiliation not provided to SSRN ( email )

No Address Available

Alessandra Lingua

affiliation not provided to SSRN ( email )

No Address Available

Daniel Therriault

Polytechnique Montréal - Laboratory for Multiscale Mechanics (LM2) ( email )

Canada

Martin Levesque

affiliation not provided to SSRN ( email )

No Address Available

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