Abstract
Boron Nitride Nanotubes (BNNTs) possess extremely high stiffness and strength and may provide the ultimate reinforcing materials for the development of nano-composites. In this paper, the Young's modulus of BNNT based composites are evaluated using a 3-D nanoscale representative volume element (RVE) based on continuum mechanics and using the finite element method (FEM). Formulas to extract the Young's modulus from solutions for the RVE are derived, based on the elasticity theory. An extended rule of mixtures, based on the strength of materials theory for estimating the effective Young's modulus in the axial direction of the RVE, is applied for comparisons with the numerical solutions based on the elasticity theory. It is observed that with additions of 5% of volume fraction of the BNNTs in a matrix of various materials, the strength of the composite can increases by an amount 20- 55% depending on material of matrix, suggesting possible use of BNNT as reinforcing material to strengthen the matrix material in composite.
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