Special Section: Micromanufacturing

A Microstructure-Level Material Model for Simulating the Machining of Carbon Nanotube Reinforced Polymer Composites

[+] Author and Article Information
Ashutosh Dikshit, Johnson Samuel, Richard E. DeVor, Shiv G. Kapoor

Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

J. Manuf. Sci. Eng 130(3), 031110 (May 12, 2008) (8 pages) doi:10.1115/1.2917564 History: Received July 18, 2007; Revised February 25, 2008; Published May 12, 2008

A continuum-based microstructure-level material model for simulation of polycarbonate carbon nanotube (CNT) composite machining has been developed wherein polycarbonate and CNT phases are modeled separately. A parametrization scheme is developed to characterize the microstructure of composites having different loadings of carbon nanotubes. The Mulliken and Boyce constitutive model [2006, “Mechanics of the Rate Dependent Elastic Plastic Deformation of Glassy Polymers from Low to High Strair Rates  ,” Int. J. Solids Struct., 43(5), pp. 1331–1356] for polycarbonate has been modified and implemented to capture thermal effects. The CNT phase is modeled as a linear elastic material. Dynamic mechanical analyzer tests are conducted on the polycarbonate phase to capture the changes in material behavior with temperature and strain rate. Compression tests are performed over a wide range of strain rates for model validation. The model predictions for yield stress are seen to be within 10% of the experimental results for all the materials tested. The model is used to study the effect of weight fraction, length, and orientation of CNTs on the mechanical behavior of the composites.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Proposed material modeling strategy

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Figure 2

TEM image of a MWCNT

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Figure 3

(a) TEM image of Composite A (b) TEM image of Composite B (c) TEM image of Composite C (4)

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Figure 4

Parametrization of CNTs

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Figure 5

Statistical distribution of parameters

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Figure 6

Procedure to simulate the composite microstructure

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Figure 7

(a) Simulated microstructure of Composite A (b) Simulated microstructure of Composite B

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Figure 8

Model prediction of PC elastic modulus curve at strain rates ranging from 10−4∕sto104∕s

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Figure 9

PC uniaxial compression curves (experimental versus predicted)

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Figure 10

(a) Composite A uniaxial compression curves (experimental versus predicted) (b) Composite B uniaxial compression curves (experimental versus predicted)

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Figure 11

CNT distribution in aligned composites: (a) simulated and (b) experimentally fabricated (27)

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Figure 12

Two-way diagrams for significant interaction effects



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