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Study of EMI-Based Damage Type Identification in a Cracked Metallic Specimen Repaired by a Composite Patch

  • ELECTROMAGNETIC METHODS
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Russian Journal of Nondestructive Testing Aims and scope Submit manuscript

Abstract

Using adhesively bonded composite patch repairs has been increased in various industries to improve the structural integrity of cracked metallic structures in recent decades. Monitoring of crack propagation and composite patch debonding, as two dominant failure mechanisms in this repair technique, plays a significant role in the integrity assessment of the component. This research conducts an experimental investigation on the simultaneous monitoring of these two failure mechanisms in a cracked metallic specimen repaired by a composite patch. For this purpose, the electromechanical impedance method was used to evaluate the feasibility of recognizing the type of damage at any phase of total damage propagation process. Two piezoelectric sensors were implemented, one mounted on the metal and the other on the composite patch. Investigation of impedance spectrums and damage index trends showed that debonding and crack propagation produce different effects on the measurements made by sensors. These differences were used as a basis of identifying the type of damage. As a result, some features were introduced to classify the type of damage in each step of damage propagation.

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Author information

Authors and Affiliations

  1. School of Aerospace Engineering, Sharif University of Technology, Tehran, Iran

    Amir Hossein Keshvari Fard

  2. School of Mechanical Engineering, Tehran University, Tehran, Iran

    Roohallah Ghasemi

  3. School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

    Bijan Mohammadi

Authors
  1. Amir Hossein Keshvari Fard
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  2. Roohallah Ghasemi
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  3. Bijan Mohammadi
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Correspondence to Amir Hossein Keshvari Fard.

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Amir Hossein Keshvari Fard, Ghasemi, R. & Mohammadi, B. Study of EMI-Based Damage Type Identification in a Cracked Metallic Specimen Repaired by a Composite Patch. Russ J Nondestruct Test 56, 540–548 (2020). https://doi.org/10.1134/S1061830920060054

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  • DOI: https://doi.org/10.1134/S1061830920060054

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