Abstract
The effect of maximum cyclic stress, σmax, on the closure behavior of surface microcracks is studied for Al 2219-T851 subjected to fatigue for fully reversed cyclic loading. The relationship between σmax and the crack closure stress σcc, is found to change as the noncrystallographic transgranular microcracks grow from intermetallic particles at the alloy surface (where they initiate) to the grain boundaries. After crack initiation, with crack lengths just slightly greater than the width of the intermetallics from which they have propagated, σcc is found to be independent of σmax· For longer microcracks with lengths of approximately the grain size, σcc∞ σmax. Crack closure mechanisms which can explain this behavior are discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
