Crack Propagation Behavior of Alumina with Different Grain Sizes under Static and Cyclic Fatigue

Hassan El Attaoui; Malika Saâdaoui; Jérôme Chevalier; Gilbert Fantozzi

doi:10.4028/www.scientific.net/KEM.317-318.449

Paper Titles

Deformation Behavior of SiO₂ Doped Nanocrystalline Monoclinic Zirconia at Low Temperatures
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Microstructure and High Temperature Strength Characteristics of Unidirectionally Solidified Al₂ O₃ /GdAlO₃ Eutectic Composite
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Influence of Grain Boundary Properties on Microcracking of AlN in Sliding Test
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The Effect of Particle Migration on the Creep-Rate of Nanocomposites
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Crack Propagation Behavior of Alumina with Different Grain Sizes under Static and Cyclic Fatigue
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Crack-Healing under Cyclic Stress and Improvement of the Resultant Fatigue Strength of Si₃N₄/SiC
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Evaluation and Control of Crack Propagation in Dense Porcelain/ Porous Alumina Layered Structures for Dental Material Applications
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Critical Conditions for Crack-Healing of Structural Ceramics under Constant or Cyclic Stress
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Simultaneous Removal of SO_x and NO_x by Catalytic Cordierite Filter
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Crack Propagation Behavior of Alumina with Different Grain Sizes under Static and Cyclic Fatigue

Abstract:

A compliance function is used to quantify the shielding capacity of grain bridging, the degradation of which is the main cyclic fatigue mechanism in alumina. Materials with different grain sizes were processed and the fatigue experiments were performed using the double torsion test. Significant degradation is observed in the coarse grain material and a marked sensitivity to the loading level is outlined. At moderate loads, bridging degradation occurs prior to fatigue crack growth during an incubation period. At low cyclic loads, the shielding capacity can be entirely degraded, leading to a cyclic fatigue threshold equivalent to that of the fine grain material.