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| Titel: |
The effects of strain rate and low-gamma irradiation on the compressive properties of UHMWPE |
| Auteur: |
Kobayashi, Koichi Kakinoki, Toshihiko Sakamoto, Makoto Tanabe, Yuji |
| Verschenen in: |
Bio-medical materials and engineering |
| Paginering: | Jaargang 17 (2007) nr. 2 pagina's 87-95 |
| Jaar: |
2007-03-15 |
| Inhoud: |
The effects of strain rate and low-gamma irradiation on the compressive properties of ultra-high molecular-weight polyethylene (UHMWPE) were investigated. Gamma irradiation was performed at 30 kGy in nitrogen or at 29 kGy in air without post-irradiation treatment. Quasi-static and impact compressive tests using the split-Hopkinson pressure-bar technique were performed to measure stress-strain relations up to a true strain of 8% at strain rates of between 0.0004 and 260 s−1. For both unirradiated and gamma-irradiated UHMWPE specimens, an increase in the strain rate significantly increased the Young's modulus and the 0.5% yield stress. Gamma irradiation in air significantly increased the Young's modulus, as determined by quasi-static and impact compressive testing, and the 0.5% yield stress, as determined by impact compressive testing. The strain-rate dependence in the power-law relationship was similar to that observed for strain rates ranging from 0.02 to 0.10 s−1 (Kurtz et al., Biomaterials 23, 2002, pp. 3681-3697). |
| Uitgever: |
IOS Press |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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