SiCw/ZrO2(6mol%Y2O3)陶瓷中晶须增韧的数值模型

ＳｉＣｗ／ＺｒＯ２（６ｍｏｌ％Ｙ２Ｏ３）陶瓷的实验研究表明，晶须桥联和裂纹偏转是其主要增韧机制。在两种机制协同增韧的基础上，建立了晶须增韧的数值模型，对材料的于点弯曲断裂过程的计算结果表明：载荷／位移曲线呈锯齿状，是由于晶须桥联作用使得裂纹扩展与停止这一过程反复出现而引起的，；随晶须含量增加，复合材料韧性提高，晶须桥联和裂纹偏转两种增韧贡献都增加，但是占主层地位的增韧机制由裂纹偏转机制逐步过渡到裂

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

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.