XVIII ENCUENTRO DEL GRUPO ESPAÑOL DE FRACTURA
28-30 de Marzo de 2001, Bayona, Pontevedra
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| Título |
CRACK CLOSURE ANALYSIS AFTER PEAK OVERLOADS |
| Autor 1 |
L.P. Borrego |
Department of Mechanical Engineering, ISEC/IPC, 3030 Coimbra, Portugal |
| Autor 2 |
J.M. Ferreira |
Department of Mechanical Engineering/FCT, University of Coimbra
Polo II, Pinhal de Marrocos, 3030 Coimbra, Portugal |
| Autor 3 |
J.M. Costa |
Department of Mechanical Engineering/FCT, University of Coimbra
Polo II, Pinhal de Marrocos, 3030 Coimbra, Portugal |
| Autor 4 |
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| Autor 6 |
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| Autor 7 |
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| Autor 8 |
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| Resúmen |
Fatigue crack propagation tests with single tensile peak overloads have been performed in 6082-T6
aluminium alloy at several baseline ?K levels, ranging from 4 to 10 MPa m1/2, and at stress ratios of 0.05 and 0.25. The
tests were carried out at constant ?K conditions, using MT specimens in a servohydraulic machine at a frequency of 20 Hz. Crack closure was monitored in all tests by the compliance technique using a pin microgauge. The observed transient post overload behaviour is discussed in terms of overload ratio and baseline ?K level. The crack closure parameter U was obtained and compared with the crack growth transients. Plasticity induced closure seems to be the main mechanism determining the transient crack growth behaviour following overloads on 6082-T6 alloy. Predictions based on crack closure measurements show good correlation with the observed crack growth rates for all the postoverload transients when discontinuous closure is accounted for. |
| Palabras Clave |
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Lugar |
Bayona |
| Tomo de Anales |
18 |
Link |
PDF |
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