Detecting defects in adhesion between a metal hemisphere and a polymer base

Detecting localized defects in adhesion on a spherical shell is challenging, especially if one has access only to its rim. Our group previously quantified the spatial average of the adhesion between a metal hemisphere and a polymer base [1]. Here we report on progress towards determining the presenc...

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Bibliographic Details
Published in2013 IEEE International Ultrasonics Symposium (IUS) pp. 695 - 698
Main Authors Salmi, A., Heino, O., Nieminen, H. J., Salmi, T., Karppinen, P., Patola, T., Haeggstrom, E., Hacking, S. A.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2013
Subjects
Acoustics
adhesion
Adhesives
Cavity resonators
guided acoustic waves
hemisphere
Measurement by laser beam
Polymers
Steel
ultrasound
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Summary:Detecting localized defects in adhesion on a spherical shell is challenging, especially if one has access only to its rim. Our group previously quantified the spatial average of the adhesion between a metal hemisphere and a polymer base [1]. Here we report on progress towards determining the presence of localized defects, their position, size, and strength. Tests were performed on a 5 cm diameter metal hemisphere attached to a UHMWPE (Polyethylene, PE RCH 1000 D150×2000 Etralene) base. Defects in adhesion were generated by machining hexagonal holes (5 to 17.5 mm) into the polymer base prior to fixing by adhesive. These known areas without adhesion were remotely characterized with a guided ultrasonic wave (Lamb quasi-modes) generated by a Nd:YAG (1064 nm, 8 ns pulse duration) pulse from one rim of the shell and detected with a laser Doppler vibrometer. We detected the presence and position of the defects.
ISSN:1051-0117
DOI:10.1109/ULTSYM.2013.0179