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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 486The Influential Factors Analysis of Surface Crack...

The Influential Factors Analysis of Surface Crack Propagation Behavior of ZrB₂-20%SiC-10%AlN Ceramic Subjected to Thermal Shock

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Abstract:

The indentation-quench method for investigating surface crack propagation has been studied through both experiments and model. The influential factors for surface crack propagation such as specimen thickness, thermal fatigue property, and quench temperature difference (ΔT) and one single specimen being used throughout a whole test ΔT were surveyed in this paper. Practical results were obtained for ZrB₂-20%SiC-10%AlN (ZSA) ultra-high temperature ceramic. The percentage crack growth versus ΔT curves showed stable crack growth in a relative low ΔT interval and unstable crack growth above a certain ΔT, and these regimes were sensitive to the thickness. The total stress intensity factor (K_I) combining residual stress and thermal stress considering dynamical behavior during the quenching test was calculated by a surface crack theoretical model, the result of calculation was analyzed influential factors and crack propagation .

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Periodical:

Advanced Materials Research (Volume 486)

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166-173

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https://doi.org/10.4028/www.scientific.net/AMR.486.166

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Online since:

March 2012

Authors:

Song He Meng, Hua Jin, Cheng Hai Xu, Wei Hua Xie

Keywords:

Ceramic, Crack Propagation, Influential Factor, Thermal Shock

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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