链网模型与Si_3N_4陶瓷材料宏细观力学行为模拟

A CHAIN NETWORK MODEL SIMULATING MACRO MECHANICAL BEHAVIOR AND MICRO DAMAGE EVOLUTION OF Si 3N 4 CERAMICS

假定原位增强陶瓷材料中存在的众多微裂纹将基体分割成块，增强体长颗粒的桥联是块间的传力机制，提出了一种链网模型，用于模拟材料宏观力学行为与细观损伤演化．论述了模型参量与材料细观组元几何，物理参数之间的关系。

By taking the bridging of elongated grains as a dominant load transfer mechanism across the intrinsic flaws in the matrix, a chain-network model is proposed and used to simulate macro mechanical response and micro damage evolution of in situ reinforced ceramics. Relation between the mechanical parameters of the chains and the geometrical-physical properties of the elongated grains is discussed. Numerical experiments and statistic investigations are carried out.