Crack‐tip toughness of lead‐free (1− x )(Na 1/2 Bi 1/2 )TiO 3 – x BaTiO 3 piezoceramics
Crack opening displacements were evaluated on semi‐elliptical indentation cracks in lead‐free (1− x )(Na 1/2 Bi 1/2 )TiO 3 – x BaTiO 3 piezoceramics and a commercially available PZT ceramic. The observed crack‐tip toughness of NBT ‐ x BT was found to be substantially higher than for PZT . Two evalua...
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| Veröffentlicht in: | Journal of the American Ceramic Society 2018-12, Vol.101 (12), p.5304-5308 |
|---|---|
| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | Crack opening displacements were evaluated on semi‐elliptical indentation cracks in lead‐free (1−
x
)(Na
1/2
Bi
1/2
)TiO
3
–
x
BaTiO
3
piezoceramics and a commercially available
PZT
ceramic. The observed crack‐tip toughness of
NBT
‐
x
BT
was found to be substantially higher than for
PZT
. Two evaluations for the crack opening displacement were demonstrated and contrasted: A more elaborate three‐term‐approximation and a pragmatic utilization of the Irwin parabola. |
|---|---|
| ISSN: | 0002-7820 1551-2916 |
| DOI: | 10.1111/jace.15972 |