Fracture toughness of Si3N4 measured with short bar chevron-notched specimens

The short bar chevron-notched specimen is used to measure the plane strain fracture toughness of hot pressed Si3N4. Specimen proportions and chevron-notch angle are varied, thereby varying the amount of crack extension to maximum load (upon which K sub IC is based). The measured toughness (4.68 + or...

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Veröffentlicht in:	Journal of materials science 1987-01, Vol.22 (1), p.321-324
Hauptverfasser:	Salem, Jonathan A., Shannon, John L., Jr
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Building materials. Ceramics. Glasses Chemical industry and chemicals Exact sciences and technology Nonmetallic Materials Refractory products Special refractories
Online-Zugang:	Volltext
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Zusammenfassung:	The short bar chevron-notched specimen is used to measure the plane strain fracture toughness of hot pressed Si3N4. Specimen proportions and chevron-notch angle are varied, thereby varying the amount of crack extension to maximum load (upon which K sub IC is based). The measured toughness (4.68 + or 0.19 MNm to the 3/2 power) is independent of these variations, inferring that the material has a flat crack growth resistance curve.
ISSN:	0022-2461 1573-4803
DOI:	10.1007/BF01160587