Fracture Toughness / Fracture Energy Data for Ceramics

NIST Standard Reference Database 138


Reference:

Reference: NIST Structural Ceramics Database

Other material collections: Property Data Summaries



Other Toughness materials

Sapphire ( Al2O3 )

Material Summary:

                      [Ref. 1]         [Ref. 2]         [Ref. 3]         [Ref. 4]         [Ref. 5]
Manufacturer........: Union Carbide    Unknown          Unknown          Unknown          Unknown
Material Designation: Sapphire         Sapphire         Sapphire         Sapphire         Sapphire
Material Form.......: Single Crystal   Single Crystal   Polycrystal      Single Crystal   Single Crystal
Composition.........: Al2O3             Al2O3            Al2O3            Al2O3             Al2O3
Processing..........: 

References:

[1] J. J. Mecholsky, S. W. Freiman, and R. W. Rice, "Fracture Surface Analysis of Ceramics" Journal of Materials Science, Vol. 11, 1310-1319 (1976).

[2] M. Iwasa and T. Ueno, "Fracture Toughness of Quartz and Sapphire Single Crystals at Room Temperature" Zairyo, Vol. 30, No. 337, pp. 1001-1004 (1981).

[3] S. W. Wiederhorn, "Fracture of Sapphire" Journal of the American Ceramic Society, Vol. 52, No. 9, pp. 485-491 (1969).

[4] G. R. Anstis, P. Chantikul, B. R. Lawn, and D. B. Marshall, "A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: I, Direct Crack Measurements" Journal of the American Ceramic Society, Vol. 64, No. 9, pp. 533-538 (1981).

[5] A. G. Evans and E. A. Charles, "Fracture Toughness Determinations by Indentation" Journal of the American Ceramic Society, Vol. 59, No. 7-8, pp. 371-372 (1976).

Property Table:

Temperature = 23 °C
Grain    Porosity    Fracture      Fracture   Measurement  Measurement  Comments
Size                 Toughness     Energy     Method       Environment
[µm]       [%]       [MPa·m1/2]     [J/m2] 
------   --------   ------------   ---------  -----------  -----------  --------------------------------
                                     7          AMDCB          air       Ref. 1; {10-10} plane; E=340 GPa
--------------------------------------------------------------------------------------------------------
                       4.54                     CF             air       Ref. 2; KIC-plane (0001), direction [11-20]
                       3.14                     CF                               KIC-plane (1-100), direction [0001]
                       2.38                     CF                               KIC-plane (1-102), direction [11-20]
                       2.43                     CF                               KIC-plane (1-120), direction [0001]
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                                     7.3        DCB            N2        Ref. 3; {10-10} plane
                                     6.0        DCB                              {-1012} plane
                                                                                 E=31 GPa; perpendicular to
                                                                                 {10-10} plane
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                       1.89                     ICS            air       Ref. 4; E=425 GPa
                       2.55                     IS
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                       2.1                      ICS            dry N2    Ref. 5; Material hot-pressed with MgO;
                                                                                 H = 23 GPa
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