颗粒改性环氧树脂基复合材料由于有着优异的力学性能在机械、电子电器、航空航天、建筑等领域有着重要的应用，深入认识此类复合材料的破坏失效机理，对于工程应用和科学研究具有重要的意义。本项目拟采用MTS、CT和TEM等技术，研究微纳米颗粒协同改性环氧树脂复合材料的破坏失效机理。通过构建一套复合材料内部结构演化三维实验观察系统，观察复合材料破坏（断裂）过程的力学行为与形貌特征，得到其在不同加载条件下的全场变形及裂纹扩展过程，并对复合材料在微纳米颗粒协同增强效应下的破坏机理进行分析。结合力学性能测试结果，探讨颗粒种类、大小、含量等参数对复合材料力学性能和破坏失效机制的影响，从而为此类复合材料的参数优化、宏观力学性能改善以及预测等方面提供实验和理论依据。

Duo to their outstanding mechanical performance, particles reinforced epoxy resin composites are widely used in many fields such as machine, electrical instrument, aerospace and architecture etc. The in-depth research on the failure mechanisms of these materials has important significance for the engineering applications and scientific researches. In this project, an experimental system which could be used to observe the evolution of microstructures in materials will be established. Base on this system, the study on the mechanical behaviors and performances of composites during loading process will be carried out, in order to analyze the synergetic effect of bimodal particle size (micrometers and nanometers) distributions on mechanical performances of filled epoxies. Combined with the mechanical testing results, the effects of micro-parameters such as particle type, size and volume fraction on the mechanical properties and performances of composites will be researched, which will offer useful experimental and theoretical references for the preferences, mechanical prediction and improvements of these materials.