دانلود رایگان مقاله انگلیسی اثر رطوبت بر چسبندگی تضمینی اتصالات فیبر های پلیمری تقویت شده (CFRP) - اشپرینگر 2018

Abstract

In this work, an experimental study has been carried out to evaluate the effect of salt water condition on the long-term adhesion of composite-to-metal bonded joints using peel tests. A new test configuration is tested via fully and partially immersed specimens with 500 mm length. Fracture surfaces of non-aged samples exhibited a cohesive failure within the adhesive layer, which indicates a good adhesion of the joint. Results revealed a significant difference in the interface adhesion between aged and non-aged condition after 150 days of immersion. Partially immersed specimens allow to evaluate the adhesion performance of the joint under dry and wet condition in single specimen using a simple peel test.

5 Conclusions

Peel tests were carried out on composite-to-steel bonded joints to study the effect of salt water. A recent developed type of peel test was applied in which a composite rigid adherend is bonded to a flexible metal adherend. New specimen configurations with longer length (500 mm) were fabricated to study the wet (ageing) and dry (non-ageing) behaviour in the same specimen. The following conclusions can be drawn:

– There is no significant effect of moisture on the adhesion after 40 days of immersion in salt water. Fracture surface shows a cohesive failure mode as in the non-aged specimens. During this period, the moisture absorption by the adhesive interface is minimal.

– There is a considerable gain in moisture at the interface between the immersion period of 40 days to 150 days. However, the ageing process proved to be timeconsuming. For faster and more evident results, either the specimen width should be reduced or a more severe ageing process should be employed (at higher temperatures for example).