Experimental Fatigue Study of Composite Patch Repaired Steel Plates with Cracks

Vasileios Karatzas, Elias A. Kotsidis, Nicholas G. Tsouvalis

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Cracks are among the most commonly encountered defects in metallic structures operating at sea. Composite patch repairing is a repair method which is gaining popularity as it counters most of the problems faced by conventional renewal repairs. Extensive studies can be found in the literature addressing the efficiency of this novel repair method using techniques which meet higher performance and monitoring standards than these commonly found in naval applications. In this work the efficiency of practices widely used in the ship repair industry for the implementation of composite patch repairing is addressed. To this end, steel plates repaired with composite patches were tested under fatigue loading. The composite patches consisted of carbon fibers in epoxy matrix and were directly laminated to the steel surface using the vacuum infusion method. Two different surface preparation methods, namely grit-blasting and mechanical treatment with the use of a needle gun were studied. In addition, in order to account for the harsh environmental conditions during the operating life of the structure and to study its effect on the repair, two different aging scenarios were considered. Non-destructive evaluation of the patches was performed so as to assess the quality of the repair, and the evolution of debonding during testing.
Original languageEnglish
JournalApplied Composite Materials
Volume22
Issue number5
Pages (from-to)507-523
ISSN0929-189X
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Composite patch
  • Fatigue
  • Crack
  • Surface preparation
  • Aging
  • Non-destructive testing

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