Investigation of Externel Bonded Patch Repair of Laminated Composite Materials Experimentaly

Abstract

For this study, woven glass and carbon fibres reinforced composite materials were produced. Composite materials have been produced with eight laminates. For experimental study, specimens with 10 mm internal hole were prepared. Then, these specimens were repaired by using adhesive and composite patches with different repair parameters. Two different bonding patch type were used for external bonding patch repair of the specimens. These were wet lay out patches and prepreg patches. Test specimens were prepared in necessary curing temperatures and laboratory conditions. By performing the unidirectional tensile test to these specimens, the ultimate failure loads of these repaired specimens were indicated. By comparing these ultimate failure loads of repaired specimens that prepared with various parameters, the effects of several repair parameters on the ultimate failure strength are investigated. These repair parameters are patch bonding area (D/W ratio), bonding length, adhesive thickness and patch thickness.