Characterization of damage and failure for nanocrystalline materials

Abstract eng:
In the present research, mechanical behaviors of the nanocrystalline materials considering the damage developing on the grain boundaries are investigated systematically. A mixed-mode cohesive interface model is used to describe the damage and failure process of the materials. Based on the mixed-mode cohesive interface model, the grain boundary damage are defined and characterized. In order to describe the size effect, the strain gradient plasticity theory is used for grain materials and the interface energy effect is considered along grain boundary. In the present results, the overall stress-strain relations and corresponding damage evolution curves are obtained and as the functions of several independent parameters. The present results show that both the overall strength and ductility of the nanocrystalline materials are closely depended on the grain boundary damage evolution and the overall stress-strain curve displays a catastrophic feature. Further discussions on the cell representativity and damage of nanoscale particle-reinforced materials are carried out.

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