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EnglishIn this paper the problem of the multiaxial fatigue limit estimation of sharply notched components has been addressed using two different methods: a critical distance method and a method involving modified Wöhler curves. These two methods had been previously developed by the authors, but required modification for use in conjunction with finite element stress analysis of sharply-notched specimens subjected to multiaxial loadings. Initially, it was demonstrated mathematically that these methods are equivalent in terms of multiaxial stresses near the notch tip. Subsequently, by employing some well-known uniaxial notch fatigue concepts, some assumptions have been made in order to extend the use of these methods to in-phase multiaxial notch fatigue situations. Experimental data was obtained from tests conducted on V-notched specimens subjected to in-phase mixed MODE I and MODE II loadings. Both methods were successful, giving fatigue limit predictions with an error usually less than 15%. This is interesting because the two methods make quite different assumptions about the nature of fatigue crack growth in the vicinity of the notch.
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| Titolo: | Two methods for predicting the multiaxial fatigue limits of sharp notches | |
| Autori: | ||
| Data di pubblicazione: | 2003 | |
| Rivista: | ||
| Abstract: | In this paper the problem of the multiaxial fatigue limit estimation of sharply notched components has been addressed using two different methods: a critical distance method and a method involving modified Wöhler curves. These two methods had been previously developed by the authors, but required modification for use in conjunction with finite element stress analysis of sharply-notched specimens subjected to multiaxial loadings. Initially, it was demonstrated mathematically that these methods are equivalent in terms of multiaxial stresses near the notch tip. Subsequently, by employing some well-known uniaxial notch fatigue concepts, some assumptions have been made in order to extend the use of these methods to in-phase multiaxial notch fatigue situations. Experimental data was obtained from tests conducted on V-notched specimens subjected to in-phase mixed MODE I and MODE II loadings. Both methods were successful, giving fatigue limit predictions with an error usually less than 15%. This is interesting because the two methods make quite different assumptions about the nature of fatigue crack growth in the vicinity of the notch. | |
| Handle: | http://hdl.handle.net/11392/1209643 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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