Investigation of the effects of thermal aging on the buckling behavior of repaired composite plates using patches and adhesives

In this paper, buckling behaviors of composite materials which are patched and adhesived from outer surface, under the thermal aging effects are analyzed experimentally. Eight-layer epoxy resin matrix woven glass fiber composite plate with cirrular hole in the middle and patches from the same plates has been patched. As adhesive double compounded Loctite 3471™ commercial brand was used. Effects of temperature variation and adhesive thickness on plates with patches are applied to single surface or both surfaces to the buckling load are investigated. For to examine the temperature change effects samples, samples are hold 2 hours, 4 hours, 6 hours and 8 hours long in 75 oC, 100 oC, and 150 oC environments. For to examine the adhesive thickness effects, at single surface patched plates adhesive thickness was 0.2 mm, 0.4 mm, 0.6 mm and for double surface patched plates adhesive thickness was 0.8 mm. As a result, it was determined that changes in temperature, time and adhesive thikness affected the critical buckling loads from 18.81 % to 116.10 %.