Pulse-echo ultrasonic testing of adhesively bonded joints in glass façades
Mojškerc, Bor ; Kek, Tomaž, 1974- ; Grum, Janez, 1946-
This article presents a pulse-echo ultrasonic method of evaluation of adhesively bonded joints in glass façades by means of the amplitudes of reflected ultrasonic signals. Glass façade specimens ...consist of three basic components: hardened glass, polysulfide or silicone adhesive and a polymer profile. Each component has its own specific acoustic impedance, which relates to a difference in the ultrasound reflection and transmission coefficients. Several glass façade specimens containing defects like air pockets, grease and duct tape are analysed. Measurements are carried out using a normal incidence piezoelectric transducer. Experiments are performed on several adhesively bonded joints in order to detect the defects in the glass-adhesive and adhesive-polymer profile interfaces. Most of the defects, except smaller areas of grease, can be successfully detected. The experimental results suggest that pulse-echo ultrasonic testing is a reasonable way of evaluating of adhesively bonded joints in glass façades.
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