Increasing the fatigue life of cracked fastener holes using bonded repairs

M. Heller, T. G. Hill, J. F. Williams, R. Jones

Research output: Contribution to journalArticleResearchpeer-review

20 Citations (Scopus)


Recent experimental work has shown that the use of a suitable bonded insert can significantly reduce the rate of fatigue crack propagation for initially uncracked geometries, and that this approach may be superior to other life enhancement schemes [7]. Some initial experimental work on three-dimensional cracked geometries was also reported in a previous paper which demonstrated that significant fatigue life extension could be achieved for this type of problem. This paper deals with the fatigue testing of specimens containing three-dimensional cracks at the edge of a fastener hole, repaired with a bonded sleeve and/or a bonded composite patch. It is shown that significant increases in fatigue life can be achieved using a bonded sleeve alone. However, the additional use of an externally bonded patch produces an increase in the fatigue life of the specimens of between 1 to 2 orders of magnitude.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalTheoretical and Applied Fracture Mechanics
Issue number1
Publication statusPublished - Apr 1989
Externally publishedYes

Cite this