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RESEARCH PAPERS

Combined Edge and Anisotropy Effects on Fickian Mass Diffusion in Polymer Composites

[+] Author and Article Information
Levent Aktas, Youssef K. Hamidi, M. Cengiz Altan

School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK 73019

J. Eng. Mater. Technol 126(4), 427-435 (Nov 09, 2004) (9 pages) doi:10.1115/1.1789959 History: Received July 25, 2003; Revised March 29, 2004; Online November 09, 2004
Copyright © 2004 by ASME
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References

Figures

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Geometry used in the formulation of diffusivity determination methods. Two aspect ratios, A1=l/h and A2=w/h, define the geometry.
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Nondimensional mass gain plots for different geometries keeping the longitudinal and transverse diffusion ratios constant
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Nondimensional mass gain plots for different longitudinal and transverse diffusion ratios keeping the geometry constant
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Slope evolution of a cubic sample for diffusion ratios ranging from 1 to 5
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Slope evolution of a sample with aspect ratios 10, for different diffusion ratios
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Percent error involved in the diffusion coefficients calculated by Shen and Springer’s method before and after correction for two different diffusion ratios. t is a representative dimensional time scale obtained by using Dx=2.5×10−9 m2/h and h=1 mm.
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Percent error involved in the diffusivity when calculated by Shen and Springer’s method for a range of diffusion ratios. Slope used in determining the error is calculated between t*=0 and t*=0.06.
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Percent error involved in the diffusivity when calculated by Shen and Springer’s method for a range of diffusion ratios. Slope used in determining the error is calculated between t*=0 and t*=0.06.
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The mass gain curves defined by the two methods used in the demonstration. Sample 1 has dimensions, h=0.004 m,w=0.04 m and l=0.04 m.
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The mass gain curves defined by the two methods used in the demonstration. Sample 2 has dimensions, h=0.004 m,w=0.004 m and l=0.008 m.

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