Fatigue of alumina-based ceramics and chrome carbide composites

Maksim V. Kireitseu; Liudmila Yerakhavets; Ion Nemerenco; Vladimir L. Basenuk

doi:10.1117/12.514392

14 October 2003 Fatigue of alumina-based ceramics and chrome carbide composites

Maksim V. Kireitseu, Liudmila Yerakhavets, Ion Nemerenco, Vladimir L. Basenuk

Proceedings Volume 5062, Smart Materials, Structures, and Systems; (2003) https://doi.org/10.1117/12.514392
Event: Smart Materials, Structures, and Systems, 2002, Bangalore, India

Abstract

The paper was revealed a fatigue in the alumina-chrome carbide composite. The trapped crack front resembles a collinear array of microcracks interspersed by grains rich in transformable precipitates. This micromechanical model provides a reasonable explanation for the observed fatigue crack growth. A numerical procedure similar to the one used in the analysis of the array of collinear cracks, based on complex potentials and dislocation formalism is also used to simulate fatigue of composite coatings based on oxide ceramics and chrome carbide. Assuming power-law crack growth, it is found that the crack growth rate decreases with the applied stress intensity factor in the initial stage of fatigue crack growth. Depending on the applied load and the amount of transformation, the growth rate either goes through a minimum before increasing to the normal crack regime, or the rate continues to decrease until the crack is arrested. A detailed parametric study of the phenomenon of fatigue crack arrest in composite coatings based on oxide ceramics and chrome carbide reveals that the combination of transformation strength parameter and applied load determines whether or not crack arrest will occur, irrespective of the initial crack length. Based on the parametric study a simple linear relationship between the applied load and the minimum transformation strength parameter necessary to cause crack arrest has been developed. it will be found useful in the design against fatigue by predicting the maximum toad at which crack arrest can be expected.

Citation Download Citation

Maksim V. Kireitseu, Liudmila Yerakhavets, Ion Nemerenco, and Vladimir L. Basenuk "Fatigue of alumina-based ceramics and chrome carbide composites", Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); https://doi.org/10.1117/12.514392

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