The influence mechanism of the strain rate on the tensile behavior of copper nanowire

LY Zhao and Y Liu, SCIENCE CHINA-TECHNOLOGICAL SCIENCES, 62, 2014-2020 (2019).

DOI: 10.1007/s11431-019-9530-6

The influence mechanism of the strain rate on the tensile behavior of the copper nanowires is investigated with molecular dynamics (MD) simulations. Three failure modes are observed at the loading strain rates from 5x10(6) to 1x10(9) s(-1). The three modes are named slipping mode, mixed mode and necking mode, respectively. The evolution of atomic configurations show that the competition of the lattice recovery and the dislocation multiplication determines the fracture mode, and the importance of lattice recovery decreases with the increase of strain rate. The input and the reflection of the tensile wave, which is induced by tensile loading, also plays an important role in the failure mechanism. The location of necking tends to approach the two ends of nanowire at higher strain rates.

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