Crack‐tip toughness of lead‐free (1−x)(Na1/2Bi1/2)TiO3–xBaTiO3 piezoceramics

Crack‐tip toughness of lead‐free (1−x)(Na1/2Bi1/2)TiO3–xBaTiO3 piezoceramics

Crack opening displacements were evaluated on semi‐elliptical indentation cracks in lead‐free (1−x)(Na1/2Bi1/2)TiO3–xBaTiO3 piezoceramics and a commercially available PZT ceramic. The observed crack‐tip toughness of NBT‐xBT was found to be substantially higher than for PZT. Two evaluations for the c...

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Veröffentlicht in:Journal of the American Ceramic Society 2018-12, Vol.101 (12), p.5304-5308
Hauptverfasser: Vögler, Malte, Fett, Theo, Rödel, Jürgen
Format: Artikel
Sprache:eng
Schlagworte:
Crack opening displacement
Fracture toughness
Indentation
Piezoelectric ceramics
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Zusammenfassung:Crack opening displacements were evaluated on semi‐elliptical indentation cracks in lead‐free (1−x)(Na1/2Bi1/2)TiO3–xBaTiO3 piezoceramics and a commercially available PZT ceramic. The observed crack‐tip toughness of NBT‐xBT 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