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Investigation into the mechanical properties of single-walled carbon nanotube heterojunctions.

The mechanical properties of finite-length (6,0)/(8,0) single-walled carbon nanotube (SWCNT) heterojunctions with respect to different kinds of connection segments, either coaxial or bias, are investigated using molecular dynamics simulation calculations. It is found that the resulting significant deformation of structure and significant drop of stress under yielding strain is due to the strain localization. Moreover, the deformation is occurred below the heptagon ring in the thinner segment of the heterojunctions under tension at different temperatures, whereas under compression it occurs on the heptagon ring. The computed atomic bond number distribution and radius distribution function are applied to determine the deformed atomic structure. Finally, with increasing temperature, the yielding stresses decrease for both coaxial and bias heterojunctions under tension and compression, while the dependence of temperature on the Young's modulus of the heterojunctions is only observed in the case of tension.