Nonlinear transfer of ultrasound by adhesive joints – a theoretical description
✍ Scribed by S. Hirsekorn
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 205 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0041-624X
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✦ Synopsis
Quality assessment of bond interfaces in composite materials is an important task in nondestructive material testing. Techniques to characterize or even measure the bond strength are required. In general, binding forces are nonlinear and cause a nonlinear modulation of transmitted or re¯ected ultrasonic waves. Therefore, the generated higher harmonics of an incident monochromatic wave will give information about the quality of an adhesive bond. This paper presents an ultrasonic measurement procedure that exploits the nonlinear transfer of ultrasound to distinguish between strong and weak bonds. The theoretical fundamentals of this technique are described; a measure of the bond strength of an adhesive joint and a calibration procedure are derived. Experimental results are shown, and limitations of the method and modi®cations to eliminate nonlinear error eects are discussed.