Effect of Surface Morphology on Fatigue Behaviour of Adhesively Bonded Carbon Fibres Peek Composites

In this paper, experimental fatigue behaviour of adhesively bonded PEEK composite was investigated. PEEK based materials are considered as a high performance thermoplastic materials conferring to their good mechanical properties and chemical resistant for many aggressive environments due to their semi-crystallinity property. However, it is well known that the adhesive bonding assembly of this kind of materials is difficult without an appropriate surface preparation. In the objective of enhancing the mechanical properties in cyclic fatigue of adhesively joined PEEK, sandblasting surface treatment was applied. The effect of sandblasting conditions on surface morphology was presented. Joint durability and fatigue life was expressed in terms of Wöhler curves according to surface preparation condition. In the end, an energetically approach was used to determine joint microstructural evolution in cyclic long term loading.