In Situ Monitoring of Epoxy Resin Curing Process Using Ultrasonic Technique

This paper dealt with the principles and techniques of ultrasonic online monitoring of epoxy resin cure. An experimental system of ultrasonic monitoring was built up. In the experiment, the cure process of epoxy resin of bisphenol A and No.593 curing agent system was monitored, so was the epoxy resin within carbon nanotubes. Then, the correlation method for digital wave was used to analyze the time of flight in order to get the time-dependent trend of Poisson's ratio, Young's modulus, and shear modulus in the curing process of epoxy resin. The experimental data showed that the mechanical properties of epoxy could be enhanced by adding carbon nanotubes. Moreover, the result of tensile test with strain gages proved the result of this ultrasonic method.