| Autor: | Mitsuo Niinomi, Takumi Enjitsu, Keiichi Fukunaga, Lei Wang |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Ultra-high-molecular-weight polyethylene Materials science Implant material Biomedical Engineering Biophysics Bioengineering Fractography Polymer Strain rate Fatigue limit Biomaterials Stress (mechanics) Crystallinity chemistry.chemical_compound chemistry Composite material |
| Zdroj: | Journal of Materials Science: Materials in Medicine. 12:267-272 |
| ISSN: | 0957-4530 |
| DOI: | 10.1023/a:1008923401615 |
| Popis: | In order to investigate the effect of molecular weight on fatigue characteristics in the ultra high molecular weight polyethylene (UHMWPE), tension-tension fatigue tests of notched specimens were carried out in the present study. The effects of frequency and stress ratio on the fatigue characteristics were also investigated and fractography was discussed. The fatigue strength does not increase with increasing molecular weight. The fatigue strength might be influenced by the high degree of crystallinity in spite of the decreased tie molecule density in this study. Almost no effect of frequency on the number of cycles to failure can be observed. However, the higher the frequency, the higher the crack tip temperature. The effects of heat and strain rate on the fatigue strength must be considered in polymer materials. At a high stress ratio, the stress-number of cycles to failure (S-N) curves shift to high number cycles to failure side. Both stress amplitude and mean stress influence the fatigue life of UHMWPE. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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