Publication: Elucidating the stress relaxation behaviour of 3d-printed pla materials via experimental study and prony series modelling
| datacite.subject.fos | oecd::Engineering and technology::Mechanical engineering | |
| dc.contributor.author | Millie, Tan Chia Hui | |
| dc.date.accessioned | 2025-09-08T09:15:07Z | |
| dc.date.available | 2025-09-08T09:15:07Z | |
| dc.date.issued | 2024-07-10 | |
| dc.description.abstract | This study investigates the stress relaxation behaviour of 3D printed polylactic acid (PLA) under tensile loading, with a focus on deriving and optimizing the Prony series to model its viscoelastic properties. Specimens were fabricated in three orientations (0°, 45°, and 90°) relative to the printing plane, with 20 specimens for each orientation. The tensile properties were first evaluated using a universal testing machine (UTM) to determine the Young's modulus for the first 10 specimens of each orientation. The remaining specimens underwent stress relaxation tests, divided into three groups per orientation, each subjected to different constant strain levels. The strains applied were 0.75%, 1%, and 1.25% for 0°; 0.55%, 0.64%, and 0.91% for 45°; and 0.48%, 0.64%, and 0.79% for 90°. Additionally, one specimen per orientation was analysed using digital image correlation (DIC) to observe surface deformations at the highest strain level. Experimental data from stress relaxation tests were used to develop a MATLAB code to derive the Prony series, optimizing the parameters for each orientation. The optimized Prony series provided a close approximation to the experimental data, with Root Mean Square Error (RMSE) values of 0.0407 for 0°, 0.02413 for 45°, and 0.02561 for 90°. The Prony series parameters, including G0, G, and tau, were determined for each orientation, highlighting differences in viscoelastic behaviour due to printing orientation. This research demonstrates the critical impact of printing orientation on the mechanical properties and viscoelastic behaviour of 3D printed PLA. The derived Prony series models offer valuable insights for predicting the long-term performance of PLA components under sustained loading conditions. These findings are particularly relevant for biomedical applications, where material reliability and performance are paramount. The study contributes to the broader understanding of PLA's potential in various industries, emphasizing the importance of optimizing printing parameters to enhance material properties. | |
| dc.identifier.uri | https://erepo.usm.my/handle/123456789/22523 | |
| dc.language.iso | en | |
| dc.title | Elucidating the stress relaxation behaviour of 3d-printed pla materials via experimental study and prony series modelling | |
| dc.type | Resource Types::text::report::technical report | |
| dspace.entity.type | Publication | |
| oairecerif.author.affiliation | Universiti Sains Malaysia |