Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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CRACK CLOSURE ANALYSIS AFTER PEAK OVERLOADS

L.P. Borrego  J.M. Ferreira  J.M. Costa      

Anales de la Mecánica de la Fractura, nº 18 . 2001 . Pág. -
Ver (.pdf): 7014IMP

Resumen: 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.

LocalizaciónBayona

Department of Mechanical Engineering, ISEC/IPC, 3030 Coimbra, Portugal
Department of Mechanical Engineering/FCT, University of Coimbra Polo II, Pinhal de Marrocos, 3030 Coimbra, Portugal
Department of Mechanical Engineering/FCT, University of Coimbra Polo II, Pinhal de Marrocos, 3030 Coimbra, Portugal




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