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Temperature and Strain-Rate Dependent Plastic Deformation of Carbon Nanotube

Published online by Cambridge University Press:  21 March 2011

Chengyu Wei  and
Kyeongjae Cho
Chengyu Wei
Affiliation:
Department of Mechanical Engineering, Stanford University, California; Deepak Srivastava, NASA Ames Research Center, MST27A-1, Moffett Field, California
Kyeongjae Cho
Affiliation:
Department of Mechanical Engineering, Stanford University, California; Deepak Srivastava, NASA Ames Research Center, MST27A-1, Moffett Field, California
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Abstract

In this work we use classical molecular dynamics to study strain rate and temperature dependent plasticity of carbon nanotube (CNT) under compressive strain. We focus on two types of defects: sp3 bond formation and bond rotation. Our simulation shows that thermal fluctuations help the strained CNT to overcome the local energy barrier to obtain plastic deformation. The yielding strain of a compressed CNT found to be strain-rate and temperature dependent, and low strain rate limit of the yielding strain is estimated to be less that 6%.

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