Size Dependent Fracture Enhancement of Transformation Composite Ceramic with Partially Debonding Interphase

作者：Ni Xinhua^*; Liu Xiequan; Han Baohong; Zhang Shuqin; Cheng Zhaogang

来源：Advanced Science Letters, 2011, 4(4-5): 1767-1770.

DOI：10.1166/asl.2011.1467

• Transformation Composite Ceramic
• Partially Debonding Interphase
• Strain Energy Release Rate Fracture Criterion
• The Method of Weight Function
• Size Dependence

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.

• 出版日期2011-5