Premium
Indentation Studies on Y 2 O 3 ‐Stabilized ZrO 2 : II, Toughness Determination from Stable Growth of Indentation‐Induced Cracks
Author(s) -
Dransmann Gerhard W.,
Steinbrech Rolf W.,
Pajares Antonia,
Guiberteau Fernando,
DominguezRodriguez Arturo,
Heuer Arthur H.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb05392.x
Subject(s) - indentation , materials science , fracture toughness , composite material , stress intensity factor , toughness , residual stress , fracture mechanics , tetragonal crystal system , crack growth resistance curve , ceramic , crack closure , phase (matter) , chemistry , organic chemistry
Stable indentation cracks were grown in four‐point bend tests to study the fracture toughness of two Y 2 O 3 ‐stabilized ZrO 2 ceramics containing 3 and 4 mol% Y 2 O 3 . By combining microscopic in situ stable crack growth observations at discrete stresses with crack profile measurements, the dependence of toughness on crack extension was determined from crack extension plots, which graphically separate the crack driving residual stress intensity and applied stress intensity factors. Both materials exhibit steeply rising R ‐curves, with a plateau toughness of 4.5 and 3.1 Mpa·m 1/2 for the 3‐ and 4‐mol% materials, respectively. The magnitude of the plateau toughness reflects the fraction of tetragonal grains contributing to transformation toughening.