Photoacoustic characteristics of dynamical adhesion of films on a metallic substrate |
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Authors: | M Zhou YK Zhang L Cai JZ Zhou ZH Shen XR Zhang SY Zhang |
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Institution: | (1) College of Material Science and Engineering, Jiangsu University, 212013 Zhenjiang, P.R. China, CN;(2) State Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, 210093 Nanjing, P.R. China, CN |
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Abstract: | In this communication, we report a numerical model that predicts the mechanical deformations associated with the pulsed laser
irradiation of a film surface, based on thermal diffusion theory. The model is consequently advanced to produce a method for
evaluating film adhesion strength. The epicenter surface displacements within the irradiated fields have been measured using
a heterodyne interferometer. The comparison of the experimental data and the displacements calculated by the model shows good
agreement. By investigating the propagating acoustic modes under non-destructive and destructive modes, we reveal that, with
or without interface delamination, the phase structure of the longitudinal waves will be altered due to the change of reflection
mode at the interface. Applying shock dynamics theory, we evaluate the adhesion strength of the TiN/stainless interface. We
also indicate the strain rate can be up to 105∼106 s-1 during film interface delamination.
Received: 5 April 2002 / Accepted: 24 June 2002 / Published online: 26 February 2003
RID="*"
ID="*"Corresponding author. Fax: +86-511/879-1919, E-mail: mzhou@ujs.edu.cn |
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Keywords: | PACS: 42 62 Cf 62 20 -x 81 40 Vw 62 50 +p 81 65 -b |
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