Fracture Behavior of Carbon Nanotube-Based Composites with a Broken Fiber Using Multi-Scale Finite Element Modeling
Present study deals with the debonding between the broken carbon nanotube (CNT) and the matrix in CNT-based composites. A three dimensional (3D) square representative volume element (RVE) with one CNT fiber surrounded by matrix has been considered. A full 3D finite element (FE) analysis
with multi-scale modeling has been carried out to calculate the stresses at the interface of the broken fiber and matrix near the vicinity of the break. Considering a very small debonding around the fiber break as a crack front, the strain energy release rates (SERRs) are also calculated using
virtual crack closure integral (VCCI) method to assess the propensity of such a crack to grow leading to complete fiber debonding. Effects of important parameters like matrix properties and volume fraction on the stress distribution and on SERR have been studied. It is observed that matrix
properties and volume fraction decide the magnitude of stresses near the fiber break and SERR thus deciding the chance of debonding. Variations of SERRs with crack length have also been investigated. It has also been observed that the stresses produced due to mode-II are only responsible for
fiber debonding.
Document Type: Research Article
Publication date: 01 March 2014
- Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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