A Numerical Model of Whisker Toughening in SiCw/ZrO2(6mol%Y2O3)Ceramics

Abstract

Abstract: Experimental investigation on whisker toughening in SiC_w/ZrO₂(6mol%Y₂O₃) ceramics shows that two main toughening mechanisms, including crack bridging and crack deflection operate simultaneously
during crack propagation. A numerical model of whisker toughening was proposed to estimate the combing toughening contribution from crack
bridging and crack deflection. The calculated results reveal that the load/displacement curve exhibits a zig-zag shape as a result of the repeated crack extension, followed by crack arrest behavior.
With increasing whisker content, both of contributions of crack bridging and crack deflection increase, additionally, the dominant toughening mechanism is gradually changed from crack deflection to crack
bridging. The rationality of the mode was proved with some experimental results.

Key words: ceramic composite, whisker toughening, toughening model, R-curve

CLC Number:

TB3232

SONG Gut-Ming,ZHOU Yu,LIN Guang-Yong,JIA De-Chang,LEI Ting-Quan. A Numerical Model of Whisker Toughening in SiC_w/ZrO₂(6mol%Y₂O₃)Ceramics[J]. Journal of Inorganic Materials.

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A Numerical Model of Whisker Toughening in SiC_w/ZrO₂(6mol%Y₂O₃)Ceramics

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