0
Research Papers

Inverse Method for Estimating Resistivity of Carbon Fiber Composite Structures

[+] Author and Article Information
Sung-Uk Zhang, Ashok V. Kumar

Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611

J. Eng. Mater. Technol 133(1), 011009 (Dec 02, 2010) (6 pages) doi:10.1115/1.4002627 History: Received January 21, 2010; Revised July 14, 2010; Published December 02, 2010; Online December 02, 2010

A method to estimate the resistivity of composite structures using an inverse problem solving algorithm is presented that uses voltage distribution on the structure as data. Electrodes attached to the surface of the structure are used to obtain voltage data in response to current injection through a pair of these electrodes. The forward problem involves using the finite element method to predict the voltages at the electrodes using known values of resistivity. The inverse problem involves solving for the resistivity values using the experimentally measured voltage data. If the material does not have uniform properties, the computed resistivity values are average values. Damage or defect in a composite structure can significantly alter the average resistivity of the structure. To explore the possibility of using this approach to detect defects in manufacturing or damage due to loading, the effect of artificially induced damage/defect on the overall resistivity of the structure is studied.

FIGURES IN THIS ARTICLE
<>
Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Two conventional methods to measure resistivity: (a) two-probe method and (b) four-probe method

Grahic Jump Location
Figure 2

A schematic diagram of the experimental setup

Grahic Jump Location
Figure 3

FEA model of specimen with eight electrodes

Grahic Jump Location
Figure 4

The voltage distribution as the solution of a forward problem

Grahic Jump Location
Figure 5

Error in computed resistivity due to noise in voltage data

Grahic Jump Location
Figure 6

Size and shape of the damaged region modeled in the forward problem

Grahic Jump Location
Figure 7

Computed average conductivity versus damage size

Grahic Jump Location
Figure 8

Woven fiber composite prepregs with embedded Teflon patches

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In