Characterization of Composite and Adhesive Cure by Ultrasonic Waves
Thermosetting resins are widely used as matrices for advanced composite materials and structural adhesives. Fabrication of composite materials or adhesive joining consists of curing (polymerization), under proper thermal and pressure conditions, of resin-impregnated fiber fabrics. During the curing reaction, the thermoset resin transforms from the visco-liquid state to a gel and then vitrifies to the gelled glass. This transformation is accompanied by strong changes of the viscoelastic properties of the material which are related to the molecular network. Therefore measurements of velocity and attenuation of ultrasonic waves during cure may give important information on the extent of the thermoset curing reaction and the mechanical properties of the material.
KeywordsLongitudinal Wave Ultrasonic Wave Ultrasonic Velocity Slip Boundary Condition Pure Epoxy
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- 7.H. T. Hahn, Application of ultrasonic technique to cure characterization of epoxies, in.: “Nondestructive Methods for Material Property Determination,” C. O. Ruud and R. E. Green, eds., Plenum, New York (1983).Google Scholar
- 8.J. K. Gilham, Torsional braid analysis of polymers, in: “Developments in Polymer Characterization,” J. V. Daukins, ed., Applied Science Pub., London (1982).Google Scholar