Jc. Hay et Kw. White, MICROSTRUCTURAL INTERACTION IN THE WAKE COHESIVE ZONE FOR SMALL CRACK-OPENING DISPLACEMENTS, Acta materialia, 45(9), 1997, pp. 3625-3633
Citations number
40
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
This study examines the role of crack-face bridging microstructural li
gaments in alumina subjected to small applied displacements. Quasistat
ic, monotonic loading studies have been important in the foundation of
toughening mechanism characterization, where the critical features ar
e of the order of the grain size. This work, however, reveals the more
subtle role of subgrain-size features responsible for degradation of
the R-curve by load-cycling in the small-displacement regime. Based on
the current results, fatigue-related degradation depends upon damage
to features of the order of 0.1 mu m, or about 0.5% of the mean grain
size. Applied displacements beyond the 0.1 mu m critical displacement
for this alumina resulted in nonrecoverable displacements. (C) 1997 Ac
ta Metallurgica Inc.