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Theoretical and experimental investigation of the interaction forces in thin bonded interfaces by nonlinear ultrasonic transmission

: Hirsekorn, S.; Koka, A.; Arnold, W.

Mazal, P. ; Czech Society for Nondestructive Testing; Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin:
2nd Workshop "NDT in Progress" 2003 : 2nd International Meeting of NDT-Experts, October 6-8, 2003 Prague, Czech Republic. Proceedings
Prag: Brno, 2003
ISBN: 80-214-2475-3
Workshop on "NDT in Progress" <2003, Prag>
Conference Paper
Fraunhofer IZFP ()
bond quality; interaction forces; ultrasound

Nonlinear stress-strain relations of adhesive bonds cause a nonlinear modulation of ultrasonic waves in reflection as well as in transmission provided sufficiently high strain amplitudes can be obtained. The amplitudes and phases of these waves contain information about the transfering interaction forces. Thin bonded interfaces can be approximately described only by binding forces without taking into account directly the material properties of the adhesive layer. In this case, the local interaction forces, which may contain damping and hysteretic effects, can be probed by the measured amplitudes and phases of the ultrasonic waves transmitted through the interface. The input and output wave parameters are calibrated interferometriacally to yield absolute interaction force values. This paper presents calibrated measurements on samples consisting of two aluminum plates joined together by a thin epoxy layer.