| Autor: |
EL-Tawil, Khaled, Kadry, Seifedine, AbouJaoude, Abdo |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 9/9/2009, Vol. 1168 Issue 1, p1510-1514, 5p |
| Abstrakt: |
The fatigue failure is most critical factor in lifetime estimation of industrial elements. The failure of a device in fatigue is due to a crack growth becoming instable and leading to strength decreasing. Based on Paris equation and S-N curves of WhÖler, the probabilistic fatigue crack growth is studied where each parameter can be considered as random variable. A reliability analysis was developed here for plates under fatigue crack; the failure event taken can be expressed by many performance functions called limits states depending on possible failure modes. We study 3 limit states, the first is the reaching of a critical value of crack width acr, the second is the reaching of the capacity value of tenacity of materials KIC, the third is the reaching of a critical number of cycles of applied stresses Ncr. Between theses 3 modes, we choose the most critical one toward the reliability value. A model of crack growth with respect to time is chosen to evaluate the time-reliability variation and hence to estimate the life time corresponding to a desired level of reliability. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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