Abstract
Hard maple adherends were bonded with six different types of adhesives while monitoring the curing process by acousto-ultrasonic transmission. Adhesives included hot melt, cellulose nitrate, polyvinylacetate, epoxy, cyanoacrylate, and resorcinol. The adherends were lapped for a 25 × 25 mm bond area and either shimmed or lightly clamped. Standard acoustic emission sensors, 175 kHz transmitter and 75 kHz receiver, were used to generate an RMS voltage output which increased as the adhesive cured. The transmission increase was quantified using a half-time to cure. The diffusion of solvents from cellulose nitrate and cyanoacrylate adhesives appeared to cause complex and variable transmission. Hot melt, polyvinylacetate and resorcinol produced curves similar to those previously reported for epoxies. In all cases, the presence of shims had a dominant effect on the nature of the transmission curves.
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