The Griffith Criterion and the Reversible and Irreversible Fracture of Brittle Materials

1974 ◽  
pp. 749-755 ◽  
Author(s):  
D. P. H. Hasselman ◽  
D. A. Krohn ◽  
R. C. Bradt ◽  
J. A. Coppola
Keyword(s):  
Brittle Materials ◽  
Griffith Criterion

A Biaxial Fracture Criterion for Porous Brittle Materials

1968 ◽  
Vol 90 (2) ◽  
pp. 285-291 ◽  
Author(s):  
H. W. Babel ◽  
G. Sines
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Compressive Stress ◽  
Brittle Materials ◽  
Test Results ◽  
Test Procedures ◽  
Statistical Confidence ◽  
Griffith Criterion ◽  
Porous Zirconia ◽  
Average Compressive Strength

The Griffith criterion for fracture of brittle materials is based on a model of a continuum in which infinitely sharp cracks are distributed with random orientations. This study extends the Griffith analysis to cracks of finite sharpness. While the Griffith criterion predicts a compressive strength of eight times the tensile strength, the extended criterion predicts a compressive strength of any value from three to eight times the tensile strength depending on the sharpness of the cracks. To test the validity of the extended criterion, tests were conducted on porous zirconia under ratios of compressive to tensile stress of 0, 3, and 5, and under compressive stress. A specimen was designed and test procedures developed so that the average bending stress was 1.99 percent. A test program was designed so that a statistical confidence limit could be assigned to the test results. The test results of the proposed criterion fell within a 99 percent confidence band, while all other criteria fell outside of the band for many combinations of tensile and compressive stress. The average compressive strength of the porous zirconia was approximately 7.1 times the tensile strength.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Failure wave as resonance excitation of collective burst modes of defects in shocked brittle materials

2000 ◽  
Vol 10 (PR9) ◽  
pp. Pr9-811-Pr9-816 ◽  
Author(s):  
O. A. Plekhov ◽  
D. N. Eremeev ◽  
O. B. Naimark
Keyword(s):  
Brittle Materials ◽  
Resonance Excitation ◽  
Failure Wave

Structural Reliability of Brittle Materials at High Temperatures.

1984 ◽  
Author(s):  
S. M. Wiederhorn ◽  
N. J. Tighe ◽  
T. J. Chuang ◽  
K. A. Hardman-Rhyne ◽  
B. J. Hockey
Keyword(s):  
High Temperatures ◽  
Structural Reliability ◽  
Brittle Materials

Failure Fronts in Brittle Materials and Their Morphological Instabilities

2005 ◽  
Author(s):  
Michael A. Grinfeld ◽  
Scott E. Schoenfeld ◽  
Tim W. Wright
Keyword(s):  
Brittle Materials ◽  
Morphological Instabilities

Brittle Materials Design, High Temperature Gas Turbine

1975 ◽  
Author(s):  
Arthur F. McLean ◽  
Eugene A. Fisher ◽  
Raymond J. Bratton ◽  
Donald G. Miller
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Brittle Materials ◽  
Materials Design ◽  
High Temperature Gas
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