Abstract
In the control of maintenance of steel structures, it is important to measure quantitatively the wall-thinning and the actual stress of damaged and depleted materials by a non-destructive method. The main purpose of this study is to establish the thickness and the stress measurement technology for steel structures by using the electromagnetic acoustic method which does not require a coupling medium. In this paper, an experiment using specimens that imitated the effects of localized corrosion was performed by an electromagnetic acoustic transducer, in order to examine a method for a wall-thinning measurement using resonance methods. As a result, by focusing on the amount of peak amplitude of the resonance spectrum equivalent to each thickness it was confirmed that measurement of the wall-thinning depth and the wall-thinning area was possible. In addition, by the examination using a numerical simulation of the resonance spectrum, this method's detection principle was clarified and the new wall-thinning evaluation was established.
