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Measurement of crack tip toughness in alumina as a function of grain size

Seidel, Jürgen and Rödel, Jürgen (1997):
Measurement of crack tip toughness in alumina as a function of grain size.
In: Journal of the American Ceramic Society., pp. 433-438, 80, (2), [Article]

Abstract

Crack profile measurements near the crack tip in the SEM were used to measure crack tip toughness of alumina as a function of grain size (average grain size 0.9-16 mu m). For comparative tests, two crack configurations were included in the present study: straight cracks (CT specimen) loaded with an in situ device; and radial indentation cracks, The measured crack tip toughness values were independent of crack geometry, and no grain size dependence could be discerned. A mean crack tip toughness of 2.3 MPa . m(1/2) was evaluated. The crack tip toughness determined from crack profile measurements is significantly lower than the toughness evaluated with conventional indentation techniques (e.g., indentation strength bending).

Item Type: Article
Erschienen: 1997
Creators: Seidel, Jürgen and Rödel, Jürgen
Title: Measurement of crack tip toughness in alumina as a function of grain size
Language: English
Abstract:

Crack profile measurements near the crack tip in the SEM were used to measure crack tip toughness of alumina as a function of grain size (average grain size 0.9-16 mu m). For comparative tests, two crack configurations were included in the present study: straight cracks (CT specimen) loaded with an in situ device; and radial indentation cracks, The measured crack tip toughness values were independent of crack geometry, and no grain size dependence could be discerned. A mean crack tip toughness of 2.3 MPa . m(1/2) was evaluated. The crack tip toughness determined from crack profile measurements is significantly lower than the toughness evaluated with conventional indentation techniques (e.g., indentation strength bending).

Journal or Publication Title: Journal of the American Ceramic Society.
Volume: 80
Number: 2
Uncontrolled Keywords: TRANSFORMATION-TOUGHENED ZIRCONIA; POLYCRYSTALLINE ALUMINA; FRACTURE-TOUGHNESS; STRENGTH; CERAMICS; RESISTANCE; DEFLECTION; SPECIMENS; STRESSES; BEHAVIOR
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Fachbereich Materialwissenschaft (1999 aufgegangen in 11 Fachbereich Material- und Geowissenschaften)
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 Nov 2008 16:04
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