Abstract
Accurate assessment of composite adhesive bonds is one of the most crucial challenges in replacing metals with composites for structural materials. In this study, carbon fiber composite bonded lap-shear specimens with bond strengths varying from strong bonds to kissing bonds were manufactured using surface modifications and controlled chemical contaminations. The adherend surfaces were characterized by profilometry, Surface Free Energy (SFE) measurement, Fourier Transform Infrared (FTIR) spectroscopy, and Energy Dispersion Spectroscopy (EDS). The bonded specimens were characterized using Broadband Dielectric Spectroscopy (BbDS). Upon destructive testing, the strength and failure modes of the bonds were studied, and strong correlations were observed with the surface properties of the bonds. The observed trends of dielectric relaxation strength with lap-shear strength confirm the potential of BbDS as an effective non-destructive assessment tool.
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