Abstract
Composite materials such as glass and carbon fibre composites have become popular and the preferred choice in various applications due to their many advantages such as corrosion resistance, design flexibility, high strength and light weight. Combining materials with different mechanical properties make composites more difficult to evaluate where the damage mechanisms for composites are more complex than traditional materials such as steel. A relatively new non-destructive testing (NDT) method known as the electromechanical impedance (EMI) technique has been studied by various researchers, but the damage detection performance of the method on composite structures still requires more investigations before it can be accepted for field application, especially in aerospace industry due to the high standard of safety. In this paper, the detection capabilities and performance of the EMI technique subjected to different PZT attachment methods have been investigated. To this end, glass fibre composite plates with various attachment methods for the sensor have been prepared and detection of common defects such as delamination and crack with the EMI technique under study has been performed. The performance of each attachment method for identifying different damage types has been analysed and finite element analysis (FEA) was carried out for verification of the experimental results.
Highlights
Composite materials such as glass and carbon fibre composites are a category of non-metallic materials that is growing in popularity
This illustrates a common problem of conducting electromechanical impedance (EMI) technique on composite structures or on concrete as aforementioned in the previous section
AD5933 board in 2 shows the different attachment methods to damages being induced in the composite plates are shown in PZT attachment methods, while samples of the acquired impedance signatures for the various PZT3
Summary
Composite materials such as glass and carbon fibre composites are a category of non-metallic materials that is growing in popularity. In a conventional EMI measurement setup as shown, a PZT (model 5A4E, purchased from Piezo.com, Woburn, MA, USA), is used as a sensor and attached to a target structure with the positive and negative wires from the AD5933 board connected to it. No clear peaks exist throughout the frequency range of the impedance signature, such a signature will most likely fail when used to detect any damage in the target structure This illustrates a common problem of conducting EMI technique on composite structures or on concrete as aforementioned in the previous section
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