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无机材料学报 1998
A Numerical Model of Whisker Toughening in SiCw/ZrO2(6mol%Y2O3)Ceramics
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Abstract:
Experimental investigation on whisker toughening in SiCw/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.
