Chain Model for Carbon Nanotube Bundle under Plane Strain Conditions

Area of Science:

• Materials Science
• Nanotechnology
• Computational Mechanics

Background:

• Carbon nanotubes (CNTs) possess exceptional mechanical properties, making them suitable for advanced materials.
• Understanding the mechanical behavior of CNT bundles is crucial for material design.
• Existing continuum models face limitations in simulating extreme conditions like high pressures and large curvatures.

Purpose of the Study:

• To develop an efficient computational model for analyzing the mechanical response of carbon nanotube bundles.
• To investigate the behavior of CNT bundles under plane strain conditions.
• To provide a tool for designing novel CNT-based materials.

Main Methods:

• An atomistic chain model was developed to simulate CNT bundles.
• The model incorporates tensile and bending rigidity of CNT walls and van der Waals interactions.
• Simulations were performed under plane strain conditions, including biaxial, strain-controlled loading.

Main Results:

• The model accurately predicts the mechanical response and equilibrium structures of CNT bundles.
• It successfully describes large wall curvatures and wall fracture under high pressures.
• A novel equilibrium structure with four single-walled nanotubes (SWNTs) in a translational cell was identified.

Conclusions:

• The proposed atomistic chain model offers an efficient method for analyzing CNT bundle mechanics.
• It overcomes limitations of continuum models in simulating extreme mechanical behaviors.
• The model is applicable to both single-walled and multi-walled CNT bundles under plane strain conditions.