Attenuation of Ultrasound by Hollow Ceramic Spheres Embedded Within a Curing Resin
Is Version Of
Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
The basic technology of using embedded acoustic waveguides (AWG) for cure and NDE monitoring of resins and composite materials has evolved[1–11] over the last forty years. A recent paper describes new applications of AWG in which acoustic wave transmissions between two embedded waveguides allows cure monitoring of large areas of a composite panel and also, in principle, the sensing of voids occurring during curing (simulated by burying hollow ceramic spheres within a composite panel). A surprising result was the system sensitivity, as the presence of only 0.16% by volume of hollow ceramic spheres could be detected. This result prompted the more detailed study reported here of ultrasound attenuation by voids (hollow ceramic spheres) embedded within a curing resin.