Abstract：Grain size, temperature and strain rate have significant effect on the mechanical properties of nanomaterials. By molecular dynamics (MD) simulation, the present paper analyzes the Young's elastic modulus, ultimate stress and ultimate strain of different grain size of polycrystalline graphene under different temperature and tensile strain rate. The results show that the grain size, temperature, tensile strain rate have significant influence on tensile mechanical properties. Using the theory of orthogonal experimental method, influence factors sensitivities of grain size, temperature, tensile strain rate on Young's elastic modulus, ultimate stress and ultimate strain are analyzed. The results show that, for the Young's elastic modulus and ultimate stress, the sensitivity order from large to small are grain size, temperature and tensile strain rate, while that is grain size, tensile strain rate and temperature for ultimate strain. The research results can offer reference to theory research and engineering application of polycrystalline graphene.
2016, Vol. 37 
