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research-article

Detection of Flat-Bottom Holes in Conductive Composites Using Active Microwave Thermography

[+] Author and Article Information
Ali Mirala

Applied Microwave Nondestructive Testing Laboratory (amntl), Electrical and Computer Engineering Department, Missouri University of Science and Technology, 210 Engineering Research Laboratory, 500 W. 16th St., Rolla, MO 65409-0040, USA
amq3b@mst.edu

Ali Foudazi

Applied Microwave Nondestructive Testing Laboratory (amntl), Electrical and Computer Engineering Department, Missouri University of Science and Technology, 210 Engineering Research Laboratory, 500 W. 16th St., Rolla, MO 65409-0040, USA
afz73@mst.edu

Mohammad Tayeb Ghasr

Applied Microwave Nondestructive Testing Laboratory (amntl), Electrical and Computer Engineering Department, Missouri University of Science and Technology, 210 Engineering Research Laboratory, 500 W. 16th St., Rolla, MO 65409-0040, USA
mtg7w6@mst.edu

Kristen M. Donnell

Electrical and Computer Engineering Department, Missouri University of Science and Technology, 301 W. 16th St., Rolla, MO 65409-0040, USA
kmdgfd@mst.edu

1Corresponding author.

ASME doi:10.1115/1.4040673 History: Received April 12, 2018; Revised June 20, 2018

Abstract

Active Microwave Thermography (AMT) is an integrated nondestructive testing (NDT) technique that utilizes a microwave-based thermal excitation and subsequent thermal measurement. AMT has shown potential for applications in the transportation, infrastructure, and aerospace industries. This paper investigates the potential of AMT for detection of defects referred to as flat-bottom holes (FBHs) in composites with high electrical conductivity such as carbon fiber-based composites. Specifically, FBHs of different dimensions machined in a carbon fiber reinforced polymer (CFRP) composite sheet are considered. Simulation and measurement results illustrate the potential for AMT as a nondestructive testing (NDT) tool for inspection of CFRP structures. In addition, a dimensional analysis of detectable defects is provided including a radius-to-depth ratio threshold for successful detection.

Copyright (c) 2018 by ASME
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