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Study of emi-based damage type identification in a cracked metallic specimen repaired by a composite patch

Keshvari Fard, A. H ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1134/S1061830920060054
  3. Publisher: Pleiades Publishing , 2020
  4. Abstract:
  5. 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. © 2020, Pleiades Publishing, Ltd
  6. Keywords:
  7. Composite patch ; Crack ; Damage index ; Electromechanical impedance ; Piezoelectric ; Structural health monitoring ; Adhesives ; Crack propagation ; Cracks ; Damage detection ; Debonding ; Metals ; Plates (structural components) ; Repair ; Stress intensity factors ; Adhesively bonded composite patches ; Electro-mechanical impedance methods ; Experimental investigations ; Impedance spectrum ; Integrity assessment ; Metallic structures ; Piezoelectric sensors ; Simultaneous monitoring ; Failure (mechanical)
  8. Source: Russian Journal of Nondestructive Testing ; Volume 56, Issue 6 , 2020 , Pages 540-548
  9. URL: https://link.springer.com/article/10.1134/S1061830920060054