| Autor: |
Nicholas Fasanella, Veeraraghavan Sundararaghavan |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. |
| DOI: |
10.2514/6.2015-0124 |
| Popis: |
Molecular dynamics simulations are performed to compute thermal and mechanical properties of cured epoxy resins reinforced with pristine and covalently functionalized carbon nanotubes. A DGEBA-DDS epoxy network was built using the ’dendrimer’ growth approach where 75% of available epoxy sites were cross-linked. The epoxy model is verified through comparisons to experiments, and simulations are performed on nanotube reinforced cross-linked epoxy matrix using the CVFF force field in LAMMPS. Full elastic stiffness matrices and linear coefficient of thermal expansion vectors are obtained for the nanocomposites. Large increases in stiffness and large decreases in thermal expansion were seen along the direction of the nanotube for both nanocomposite systems when compared to neat epoxy. The direction transverse to nanotube saw a 40% increase in stiffness due to covalent functionalization over neat epoxy at 1 K whereas the pristine nanotube system only saw a 7% increase due to van der Waal effects. The functionalized SWNT/epoxy nanocomposite showed an additional 42% decrease in thermal expansion along the nanotube direction when compared to the pristine SWNT/epoxy nanocomposite. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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