Abstract
In recent years, nano-crystalline materials have attracted many researchers' attention, but the fracture mechanism has not been fully clarified. In a molecular dynamics (MD) simulation, grain size and crystal orientation can be chosen, and their effects on the mechanical properties of nano-crystalline materials can be evaluated clearly. However, the accuracy and computational time of MD simulation depends on its interatomic potential. In our previous research, it is confirmed that the Hybrid potential method, which connects FS potential and MEAM potential by the use of Handshake method, provide the high reliable results in short computational time. In this paper, the crack growth behavior analysis in nano-crystalline Fe by the use of Hybrid potential is demonstrated, and the grain-size and strain-rate dependency of fracture behavior is clarified.
