Analysis of temperature and aging effects on biomedical ultra-high molecular weight polyethylene's grades using a viscoelastic model
The applicability of a proposed viscoelastic model, previously developed to model dynamic behaviour of ultra-high molecular weight polyethylenes (UHMWPE), was assessed using three different UHMWPE medical grades. The dynamic data, collected from literature, was obtained via DMTA (Dynamic Mechanical...
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| Format: | article |
| Language: | eng |
| Published: |
2011
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| Online Access: | https://repositorio-aberto.up.pt/handle/10216/97378 |
| Country: | Portugal |
| Oai: | oai:repositorio-aberto.up.pt:10216/97378 |
| Summary: | The applicability of a proposed viscoelastic model, previously developed to model dynamic behaviour of ultra-high molecular weight polyethylenes (UHMWPE), was assessed using three different UHMWPE medical grades. The dynamic data, collected from literature, was obtained via DMTA (Dynamic Mechanical Thermal Analysis) operated over a wide temperature and frequency range. The time-temperature superposition principle (TTSP) was applied to dynamic data via the proposed viscoelastic model. A reference temperature of 37 degrees C was selected. It was verified that both horizontal and vertical shifts are necessary to superimpose the dynamic modulus/frequency curves of all UHMWPE grades. Moreover, it was shown that the aging effect can be modelled using an aging-time superposition principle based on the proposed viscoelastic model. Again, both horizontal and vertical shifts were necessary to superimpose the aged and non-aged dynamic modulus/frequency curves at 37 degrees C. |
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