The piezoelectric implant method has demonstrated its efficiency to monitor the mechanical properties of polymer based materials and in particular to follow in situ curing and ageing phenomena. From the electrical impedance of a piezoelectric plate inserted in the material to be tested and using an optimization algorithm, we have shown previously that it is possible to determine two acoustical parameters of the material: the attenuation and the velocity of the ultrasonic waves. This paper deals with the influence of different defects (non parallelism and debonding) on the validity of these results. Thanks to a model, and using the Kramers-Kronig relations, the defect that does not disturb the correct use of the identification process were evaluated.

Date Published: 26 April 1996
PDF: 6 pages
Proc. SPIE 2779, 3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials, (26 April 1996); doi: 10.1117/12.237103

Published in SPIE Proceedings Vol. 2779:
3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials
Pierre Francois Gobin; Jacques Tatibouet, Editor(s)