Title: A study on a rigid body boundary layer interface force model for stress calculation and stress–strain behaviour of nanoscale uniaxial tension
Abstract: A rigid body boundary layer interface force (RIF) model for stress calculation on the nanoscale is proposed in this paper for calculating stress based on molecular dynamics. The RIF model is used to study the stress–stain behaviour when nanoscale single crystal copper is under uniaxial tension, and is used for 15 tensile simulations each with different strain rate. The stress–strain curve established from simulation was first converted into a true stress–strain curve; a regression analysis was then applied in order to find the flow curve. From simulation results, it is found that the strain rate has large influence on both K and n values of the flow curve. At low strain rate (less than 1 × 1012 s−1), both K and n values decrease with the increase of strain rate. When the strain rate exceeds 1 × 1012 s−1, the strain rate against the K and n values of the flow curve approaches a constant. Flow curve equations considering the influence of strain rate are derived; both complete and simplified forms of flow curve equations are also derived. It is observed that the lower the strain rates, the higher the fluctuations of the stress–strain curve. Furthermore, the increase of strain rate resulting in a smoother stress–strain curve is also found.
Publication Year: 2004
Publication Date: 2004-09-11
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 27
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