Broadband poly(vinylidene fluoride-trifluoroethylene) ultrasound focusing transducers for determining elastic constants of coating materials

Cheng Hsien Chung, Yung Chun Lee

研究成果: Article同行評審

20 引文 斯高帕斯(Scopus)

摘要

This paper develops broadband Poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] focusing transducers and its surface wave measurement system for determining the elastic constants of coating layers. The measurement is based on a defocussing measurement method and V(f,z) analysis of the focusing transducers. Few P(VDF-TrFE) focusing transducers are successfully fabricated in laboratory and the wave measurements can cover a wide frequency range of 4-120 MHz with great accuracy. Brass and glass substrates electroplated with nickel coating layer with thickness ranging from 15 to 60 μm are tested in this work. Dispersion curves sensitivity analysis is carried out to decide the best approach for inversely determination of coating elastic properties. A searching method based on the downhill simplex algorithm and numerical calculation on waves in a layered half-space model is used for inversely determining the elastic constants of coating layer. The results show good agreement with reported data. Measurement accuracy and potential applications for other types of nondestructive evaluation of the focusing transducers and measurement system are addressed.

原文English
頁(從 - 到)101-110
頁數10
期刊Journal of Nondestructive Evaluation
28
發行號3-4
DOIs
出版狀態Published - 2009

All Science Journal Classification (ASJC) codes

  • 材料力學
  • 機械工業

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