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Wake history effect on closure of short and long fatigue crack in 304L stainless steel by K. Vor; C. Sarrazin-Baudoux; C. Gardin; J. Petit is a Engineering article available to read on EtoBox.

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The effect of crack length and of crack wake history on crack closure is investigated in 304L austenitic steel. Tests are run on CT specimens initially pre-cracked at constant applied stress intensity factor range K, at a load ratio R=0.1. After precracking, the crack wakes are machined to obtain 2D physically short cracks. Then propagation of these short cracks is still performed at constant K for length ranging from 0.1mm up to 4mm. A numerical analysis of load-displacement data allows improved closure detection for the smaller short cracks. The ratio = K op /K max is shown to decrease with decreasing crack length a for a 1.2mm, the long crack domain is reached and is shown constant and equal to 0.352 independently of K. For tests usually run at increasing K or decreasing K, is dependent on the variation of K with a, and the relation da/dN vs K is shown dependent on the loading history. But in all cases, the crack propagation rates are rationalized in term of K eff .

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Author

K. Vor; C. Sarrazin-Baudoux; C. Gardin; J. Petit

Publisher

Elsevier ; [Oxford]: Elsevier Ltd.; Elsevier BV (ISSN 1877-7058)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)