SYMPOSIA PAPER Published: 01 January 1995
STP14610S

Shear Fatigue Crack Growth in Large Grain Polycrystals

Source

Fatigue cracks are often nucleated as small shear cracks. The propagation of such a crack often results in a crack plane that is inclined to the loading axis in such a manner to induce a mixed Mode I, Mode II, and Mode III crack-tip field. In this study, crack growth rates of Mode II and Mode III shear cracks as well as Mode I cracks in large-grain Al 7029 aluminum alloy were measured. The crack-tip resolved shear stress intensity factor, KRSS, was defined and calculated for each slip system in a crystal. The result of the study shows that KRSS is capable of characterizing the shear decohesion mechanism of crack growth, explaining the morphological features of a crack surface, and correlating with shear crack growth rate.

Author Information

Chen, Q
Solid State Science and Technology, Syracuse University, Syracuse, NY
Liu, HW
Solid State Science and Technology, Syracuse University, Syracuse, NY
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Details
Developed by Committee: E08
Pages: 467–483
DOI: 10.1520/STP14610S
ISBN-EB: 978-0-8031-5294-6
ISBN-13: 978-0-8031-1882-9