The Significance of Plastic Zone Growth under Cyclic Loading and Crack Opening/Closing Model in Fatigue Crack Propagation

Abstract:

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Fatigue cracks remain closed at lower loading level during a part of load cycle even though a tension-to-tension loading is applied. The crack closure plays a role to obstruct the generation and growth of compressive plastic zone during unloading. Cyclic plastic work, which corresponds to an irreversible energy consumed in a cracked body is generated ahead of a crack, is required as a fatigue crack driving force. The amout of cyclic plasticity is reduced by a crack closure. The crack opening/closing model based on the Dugdale model under arbitrary stress distributions for a through thickness straight crack is proposed and the fatigue crack growth under various loadings is investigated.

Info:

Periodical:

Edited by:

Jaroslav Pokluda

Pages:

95-102

DOI:

10.4028/www.scientific.net/MSF.482.95

Citation:

M. Toyosada and K. Gotoh, "The Significance of Plastic Zone Growth under Cyclic Loading and Crack Opening/Closing Model in Fatigue Crack Propagation", Materials Science Forum, Vol. 482, pp. 95-102, 2005

Online since:

April 2005

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$35.00

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