Effects of Surface Characteristics on Mechanical and Dielectric Properties of Adhesively Bonded Carbon Fiber Composites
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Date
2021Author
Rahman, Minhazur
Kola, Gayathri
Rabby, Monjur Morshed
Elenchezhian, Muthu Ram Prabhu
Qhobosheane, Relebohile George
Vadlamudi, Vamsee
Reifsnider, Kenneth
Raihan, Rassel
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**Please note that the full text is embargoed** ABSTRACT: The rapid rise of fiber reinforced composite usage in aircraft, spacecraft and
automobile industries made the proper comprehension of repair and joining of these
materials a crucial aspect. Adhesive bonding is one of the most advantageous and
desirable joining and repair technique for fiber reinforced composites. However, the
heterogeneity of fiber reinforced composites and the complex interfacial nature of the
adhesive bonds, makes most non-destructive evaluation and assessment techniques
ineffective to assess the state of the bond. Different manufacturing and surface
preparation techniques impart different surface characteristics to the adherends, hence
proper understanding of the state of bonds is dependent upon the characteristics of the
adherend surfaces. In this approach, carbon fiber composite adherends with controlled
surface modifications were made into lap-shear test specimens using film adhesive.
The effects of surface characteristics such as surface roughness and surface free energy of the adherend surfaces, on bond performance are studied. These surface characteristics are found to be an indicator of bond performance and can even be used to explain failure modes. Moreover, the performance of these bonds with varying surface characteristics are analyzed non-destructively by dielectric spectroscopy and compared with the mechanical performance of the bonds. [This article appeared in its original form in the "Proceedings of the American Society for Composites—Thirty-sixth Technical Conference. 2021". Lancaster, PA: DEStech Publications, Inc]