In this paper, experimental fatigue behavior of adhesively bonded PEEK composite was investigated. PEEK based materials are considered as a high performance thermoplastic materials due to their semi-crystalline property giving them good mechanical properties and chemical resistance for many aggressive environments. 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 were expressed in terms of Wöhler curves according to surface preparation condition. Finally, an energetically approach and acoustic emission (AE) monitoring were used to analyze joint microstructural evolution during monotonic and cyclic long term loading.
PEEK, sandblasting, surface morphology, adhesive bonding, fatigue, acoustic emission, dissipated energy, damage.
This work has been supported by a grant from DGCIS-FUI (INMAT) managed by AIRBUS - France. The authors would like to express a special recognition to Digital Surf® - French Company for their assistance in data treatments.
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