测量双层板的兰姆波色散曲线及其在涂层材料表征中的应用。

Measuring Lamb wave dispersion curves of a bi-layered plate and its application on material characterization of coating.

作者信息

Lee Y C, Cheng S W

机构信息

Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 701.

出版信息

IEEE Trans Ultrason Ferroelectr Freq Control. 2001 May;48(3):830-7. doi: 10.1109/58.920717.

DOI:10.1109/58.920717

PMID:11381708

Abstract

This paper investigates the Lamb wave dispersion curves of a bi-layered plate and evaluates the feasibility of using the dispersion data to characterize the coating's material properties. The measurement of dispersion curves is based on a focusing PVDF transducer operating in a pulse/echo mode. An image displaying technique is used to determine the dispersion relation of Lamb waves from the measured data. Multiple dispersion curves of Lamb waves are accurately determined over a wide frequency range (4 to 20 MHz). Lamb wave dispersion curves for thin metal sheets electro-deposited with nickel coatings are measured. The elastic constants of the nickel coating are determined by comparing the experimental dispersion data with the theoretical ones calculated numerically. Potential applications of this measurement method are addressed.

摘要

本文研究了双层板的兰姆波色散曲线，并评估了利用色散数据表征涂层材料特性的可行性。色散曲线的测量基于工作在脉冲/回波模式下的聚焦聚偏氟乙烯（PVDF）换能器。采用一种图像显示技术从测量数据中确定兰姆波的色散关系。在宽频率范围（4至20兆赫兹）内准确确定了多个兰姆波色散曲线。测量了电沉积镍涂层的薄金属板的兰姆波色散曲线。通过将实验色散数据与数值计算的理论数据进行比较，确定了镍涂层的弹性常数。探讨了这种测量方法的潜在应用。