An ultrasonic pulse-echo method has been developed for non-destructive evaluation (NDE) of adhesive bonds in sheet-metal assemblies to provide assurance of bond integrity in automotive manufacturing. As the demand for improvements in fuelefficiency, performance, corrosion resistance, body stiffness and style increases, the use of adhesives continues to grow to help meet those demands by providing greater design flexibility, more materials choices and wider process options. The history of adhesive bond performance, however, indicates the need for a robust method of assuring adhesive bond integrity during the manufacturing process. The proposed method of non-destructive evaluation of adhesive bonds in sheet-metal assemblies is based on comparison of the echo signal with a reference waveform recorded previously for the first metal sheet outside of the joint. In the case of disbonding at the front metal-adhesive interface, the current and reference waveforms are very close. Disbonds at the rear adhesive-metal interface cause phase inversion of the reflected response which can estimated by reference waveform subtraction. The method has been successfully tested for all combinations of steel (0.7, 1.0, 1.5, and 2.0 mm) and aluminium (1.1, and 2.5 mm) adherend, and for all thicknesses of the adhesive layer within the range of 0.1 - 1.0 mm.
Evaluation of adhesive bonds in sheet-metal assembles by a 20 MHz ultrasonic pulse-echo technique
Bewertung von Klebverbindungen von Metallblechanordnungen mittels 20 MHz-Ultraschall-Impulsechotechnik
2006
9 Seiten, 7 Bilder, 1 Tabelle, 7 Quellen
Conference paper
Storage medium
English
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