Abstract
The application of carbon fiber reinforced plastics (CFRP) to airframes has been expanding to reduce weight of aircraft. In addition, by replacing mechanical fastening with adhesive bonding, it is possible to achieve further weight saving of the airframe. In this study, we investigated the effect of curing conditions on the strength of CFRP single lap adhesive joint using epoxy resin adhesive. Specimens with different curing conditions such as curing temperature and curing time were prepared. The reaction ratio of the adhesive samples under each curing condition was evaluated by differential scanning calorimetry (DSC) measurements. Further, tensile shear adhesive strength and failure process of the joints were evaluated by performing tensile shear tests and acoustic emission (AE) measurements on specimens. After the test, failure mode was distinguished by observing the failure surface. From the above, the relationship among the reaction ratio of the adhesive, the strength of the joint and the failure mode was clarified.
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