Title of article
A fracture mechanics approach to interior fatigue crack growth in the very high cycle regime
Author/Authors
Ogawa، نويسنده , , Takeshi and Stanzl-Tschegg، نويسنده , , Stefanie E. and Schِnbauer، نويسنده , , Bernd M.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2014
Pages
14
From page
241
To page
254
Abstract
Growth rates of optically dark areas (ODA) and fish-eyes (FE) were quantified in kHz-ultrasonic fatigue tests on SUJ2 and 17-4PH steels at constant and repeated two-step amplitudes. Sizes of ODAs and FEs depended on the stress intensity factor (SIF) range, and interior fatigue crack growth rates (FCGR) were slower than those of “long” cracks in air, suggesting vacuum as ODA growth environment. Repeated two-step tests on SUJ2 steel served to form beach marks so that, a quantification of ODA sizes, interior FCGRs and SIFs became possible. Additional FCGR measurements of long cracks in vacuum and comparable fracture morphologies allowed estimating the growth rates of ODAs and FEs in 17-4PH steel.
Keywords
ultrasonic fatigue , Cumulative damage , Repeated two-step tests , Fish-eye fracture , Fatigue crack growth
Journal title
ENGINEERING FRACTURE MECHANICS
Serial Year
2014
Journal title
ENGINEERING FRACTURE MECHANICS
Record number
2344199
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