Size Dependent Fracture Enhancement of Transformation Composite Ceramic with Partially Debonding Interphase
Size Dependent Fracture Enhancement of Transformation Composite Ceramic with Partially Debonding Interphase
复制标题
部分脱粘界面相变复合陶瓷的尺寸依赖性断裂增强
DOI：
10.1166/asl.2011.1467
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发表时间：
2011-04
影响因子：
--
通讯作者：
韩保红
中科院分区：
文献类型：
--
作者：
倪新华;刘协权;韩保红
考虑相变颗粒和部分脱粘界面相的共同作用，建立了含部分脱粘界面相的相变复相陶瓷I-II混合型裂纹增韧模型。首先，应用基于压敏应力准则和应变能释放率断裂准则的塑性本构关系，预测了相变复合陶瓷I-II型复合裂纹的断裂强化。然后用权函数法对裂缝增强进行了分析，给出了裂缝增强的理论表达式。最后，基于相变区与部分脱粘界面相的关系，利用弹性模量和微观应力场的相关性，得到了含部分脱粘界面相复合陶瓷断裂强化的尺寸依赖性。结果表明，稳态扩展裂纹的断裂强化与材料的弹性模量、相变区宽度和相变颗粒的体积分数有关，且断裂强化明显依赖于相变颗粒的尺寸。
Considering the joint effect of transformation particle and partially debonding interphase, the mixed-mode I–II crack toughening model of transformation composite ceramic with partially debonding interphase is determined. First, applying the plastic constitutive relation based on the pressure sensitive stress criterion and the strain energy release rate fracture criterion, the fracture enhancement of mixed-mode I–II crack in transformation composite ceramic is predicated. Then the fracture enhancement is analyzed by the method of weight function, and the theoretical expression of the fracture enhancement is given. Finally, based on the relation between transformation region and partially debonding interphase, the size dependence of fracture enhancement can be obtained by that of elastic modulus and micro-stress-field for composite ceramic with partially debonding interphase. Results show that the fracture enhancement for the steady-state growing crack is associated with the elastic modulus, the wide of transformation region and the volume fraction of transformation particle, and the fracture enhancement is evidently dependent on the size of particle.