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Effect of environment on mechanical properties of 3D printed polylactide for biomedical applications

journal contribution
posted on 06.12.2019 by Amirpasha Moetazedian, Andy Gleadall, Xiaoxiao Han, Vadim Silberschmidt
© 2019 Elsevier Ltd In this study, the importance of the testing environment for correct assessment of tensile strength of polylactide (PLA) is investigated. A novel design of tensile specimen was developed to test the anisotropic mechanical properties of additively manufactured specimens. The effects of three environmental factors were considered: physiological temperature (37 °C), hydration (specimens stored in solution for 48 h) and in-aqua testing (specimens submerged in solution). For the first time, these factors were studied both individually and combined, and were evaluated against a control point (non-hydrated specimens tested in air at room temperature). The tensile strength and elastic modulus of hydrated specimens tested submerged at 37 °C were reduced by 50.1% and 20.3%, respectively, versus the control. In contrast, testing the hydrated polymer in air at room temperature, which is commonly used to refer to wet strength in literature, only showed an 18.3% reduction in tensile strength with a negligible change in elastic modulus. To assess transferability of the results, additively manufactured specimens were also tested normal to the interface between 3D printed layers, and they demonstrated similar reductions in strengths and moduli. The results demonstrate the importance of using an appropriate methodology for tensile testing; otherwise, mechanical properties may be overestimated by two-fold.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of the Mechanical Behavior of Biomedical Materials

Volume

102

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Journal of the Mechanical Behavior of Biomedical Materials and the definitive published version is available at https://doi.org/10.1016/j.jmbbm.2019.103510

Acceptance date

23/10/2019

Publication date

2019-10-31

Copyright date

2020

ISSN

1751-6161

eISSN

1878-0180

Language

en

Depositor

Mr Andy Gleadall Deposit date: 5 December 2019

Article number

103510

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