I. V. Vindokurov, D. I. Sporysheva, M. A. Tashkinov

STUDYING THE EFFECT OF PRINT ORIENTATION ON THE POISSON RATIO OF ADDITIVELY MANUFACTURED BIOCOMPATIBLE POLYMER SAMPLES

The paper studies the effect of filament orientation in Fused Deposition Modeling (FDM) additive manufacturing on the Poisson ratio and mechanical properties of biocompatible polymers, namely polylactide, polyamide 12, polyetheretherketone, polysulfone, and polyetherimide. Tensile tests are carried out at two orientations of the layers (deposited at 0 and 90° relative to the direction of loading). The Poisson ratio is determined by two contactless methods, namely digital image correlation and video extensometer measurements, which allows the reproducibility and measurement accuracy to be evaluated. Additionally, the values of ultimate strength, elastic modulus, and relative elongation after rupture have been obtained. It is shown that the 0° orientation provides higher strength characteristics compared to the 90° one, which is due to the directed load perception along the printed filaments. At the same time, the influence of orientation on the Poisson ratio is found to be insignificant, with differences recorded only in the third decimal place. The maximum relative deviation between the results of the two measurement methods does not exceed 1.59 %, and it is less than 0.6 % for most materials. The data obtained refine the reference values of the Poisson ratio for additively manufactured polymers, and they can be used in numerical simulation of the stress-strain state of medical devices manufactured by FDM.

Acknowledgment: The results were obtained under the state assignment from the Russian Ministry of Science and Higher Education for conducting fundamental research (project FSNM-2025-0001).

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