TY - JOUR
T1 - Knoop hardness-apparent yield stress relationship in ceramics
AU - Swab, Jeffrey J.
AU - Wereszczak, Andrew A.
AU - Strong, Kevin T.
AU - Danna, Dominic
AU - Lasalvia, Jerry C.
AU - Ragan, Meredith E.
AU - Ritt, Patrick J.
PY - 2012
Y1 - 2012
N2 - In Tabor's classical studies of the deformation of metals, the yield stress (Y) and hardness (H) were shown to be related according to H/Y ≈ 3 for complete or fully plastic deformation. Since then it has been anecdotally shown for ceramics that this ratio is <3. Interest exists to explore this further so Hertzian indentation was used to measure the apparent yield stress of numerous ceramics and metals and their results were compared with each material's load-dependent Knoop hardness. The evaluated ceramics included standard reference materials for hardness (silicon nitride and tungsten carbide), silicon carbide, alumina, and glass. Several steel compositions were also tested for comparison. Knoop hardness measurements at 19.6 N (i.e., toward "complete or fully plastic deformation"), showed that 2 < H/Y < 3 for the metals and 0.8 < H/Y < 1.8 for the glasses and ceramics. Being that H/Y ≠ 3 for the ceramics indicates that Tabor's analysis is either not applicable to ceramics or that full plastic deformation is not achieved with a Knoop indentation or both.
AB - In Tabor's classical studies of the deformation of metals, the yield stress (Y) and hardness (H) were shown to be related according to H/Y ≈ 3 for complete or fully plastic deformation. Since then it has been anecdotally shown for ceramics that this ratio is <3. Interest exists to explore this further so Hertzian indentation was used to measure the apparent yield stress of numerous ceramics and metals and their results were compared with each material's load-dependent Knoop hardness. The evaluated ceramics included standard reference materials for hardness (silicon nitride and tungsten carbide), silicon carbide, alumina, and glass. Several steel compositions were also tested for comparison. Knoop hardness measurements at 19.6 N (i.e., toward "complete or fully plastic deformation"), showed that 2 < H/Y < 3 for the metals and 0.8 < H/Y < 1.8 for the glasses and ceramics. Being that H/Y ≠ 3 for the ceramics indicates that Tabor's analysis is either not applicable to ceramics or that full plastic deformation is not achieved with a Knoop indentation or both.
UR - http://www.scopus.com/inward/record.url?scp=84860832192&partnerID=8YFLogxK
U2 - 10.1111/j.1744-7402.2011.02686.x
DO - 10.1111/j.1744-7402.2011.02686.x
M3 - Article
AN - SCOPUS:84860832192
SN - 1546-542X
VL - 9
SP - 650
EP - 655
JO - International Journal of Applied Ceramic Technology
JF - International Journal of Applied Ceramic Technology
IS - 3
ER -