Absolute measurement of ultrasonic non-linearity parameter at contact interface

Abstract

Non-linear interaction of waves with contact interfaces has been widely applied in non-destructive evaluation fields such as bonding quality evaluation, and the detection of closed microcracks and composite delamination. This paper proposes an absolute measurement of the ultrasonic non-linearity parameter using a piezoelectric detection method for two aluminum alloy blocks of different lengths. The results of a two-dimensional finite element method model verified by models for hard and soft contact interfaces, depending on the interface property, were compared with the measured non-linearity parameter. The measured values show good agreement with the modelled results, indicating good potential for measuring the non-linearity parameter at interfaces experimentally and numerically.

Keywords::

• contact interface
• absolute measurement
• non-linear ultrasonic
• piezoelectric detection method

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning [grant number 2011-0020024]. The third author would also like to acknowledge the support from the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT & Furniture Planning [grant number 2012M2A8A4013245].