1254 KB22 KB199920252016Grum, JanezKek, TomažMojškerc, Borletnik:62številka:nr. 3str. 147-153ISSN:0039-2480COBISSID_HOST:14546971URN:URN:NBN:SI:doc-8UKSBNWDenZveza strojnih inženirjev in tehnikov Slovenije etc.Strojniški vestnikakustična impedancaimpulzno-odbojna metodalepljeni spojinadzor kakovostineporušne preiskavesteklene fasadeultrazvočne preiskavePulse-echo ultrasonic testing of adhesively bonded joints in glass façades|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 façadesNamen raziskav je razviti možen način ocenjevanja kakovosti lepljenih spojev v steklenih fasadah. Izbrana metoda preiskav naj bo neporušna, enostavna za uporabo in cenovno ugodna. Z razvojem gradbeništva in industrije so se povečale možnosti uporabe steklenih panelov v fasadah različnih stavb. Za zagotavljanje kakovosti lepljenih spojev steklenih panelov je treba le te testirati v proizvodnji in tudi med uporabo, saj lahko slabo lepljeni spoji predstavljajo nevarnost za ljudi in okolico. Lepljene spoje lahko pregledujemo vizualno, vendar nam to običajno ne nudi celovite slike o kakovosti spoja, še posebej pri neprozornih materialih. Za preiskavo te vrste materialov lahko uporabimo ultrazvočne preiskaveTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo