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Title: Partial crack closure under block loading
Authors: Borrego, L. P. 
Ferreira, J. M. 
Costa, J. M. 
Keywords: Aluminium alloy; Fatigue crack growth; Block loading; Crack closure; Partial crack closure
Issue Date: 2008
Citation: International Journal of Fatigue. 30:10-11 (2008) 1787-1796
Abstract: Fatigue crack propagation tests under high-low and low-high block loading sequences have been performed in aluminium alloy specimens. The tests were carried out at constant [Delta]K conditions. Two stress ratios were analysed: R = 0.05 and R = 0.4. Crack closure was monitored in all tests by the compliance technique using a pin microgauge. The observed transient post load step behaviour is discussed in terms of the load change magnitude, [Delta]K baseline levels and stress ratio. The crack closure level was obtained and compared with the crack growth transients. A good agreement between experimental and predicted crack growth rates is obtained when the partial crack closure effect is properly taken into account. Therefore, plasticity-induced crack closure plays an important role on the load interaction effects observed in aluminium alloys.
Rights: openAccess
Appears in Collections:FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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