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논문 기본 정보

자료유형
학술대회자료
저자정보
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2007도 추계학술대회 강연 및 논문 초록집
발행연도
2007.10
수록면
114 - 119 (6page)

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Molecular dynamics simulations are performed on CNTs with vacancy defects to investigate the effects of strain rate on mechanical properties. The sensitivity of mechanical behavior of CNTs, with different numbers of atom vacancies and their mutual arrangements and separations in different directions, with respect to the strain rates is investigated by prescribing different axial velocities in the compression simulation. The simulation result shows that in general higher strain rates lead to higher compressive strength and strain for both pristine and defected CNTs. Any strain rates higher than 1E+10/s leads the compressive properties to high values comparing to other strain rates indicating that uniform atomic distribution of the CNTs during relaxation of simulation process is insufficient for strain rates higher than 1E+10/s which gives rise to stress concentration. Mutual arrangements of two neighboring defects in CNTs show that the highest mechanical properties is obtained for all strain rates when two defects are arranged in loading direction. In case of separations of two defects in loading, perpendicular to loading and non axial direction in CNTs, mechanical properties increase as the distance between two defects increases but only for strain rates below and equal to 1E+10/s. The properties at strain rates higher than that decrease as the distance between defects increases.

목차

Abstract
INTRODUCTION
MODELLING OF DEFECTS
MD SIMULATION
DISCUSSION
CONCLUSION
ACKNOWLEDGEMENT
REFERENCES

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