Study of Ultrasound Application on Thin Solid Layer or Liquid Layer in the Triple-layer Material System under Different Environmental Conditions
Date Issued
2004
Date
2004
Author(s)
Huang, Siyao
DOI
zh-TW
Abstract
Non-destructive testing (NDT) is applied widely in the industry due to its benefits, which prolongs the life of equipment and endures products. Ultrasonic testing, a technique of NDT, uses ultrasound to produce powerful penetration, low damage and high accuracy on experimental measurement. It becomes the major measurement technique in NDT applications. Ultrasound traditionally not only detect flaws in solids but also determine material properties by measuring velocities of longitudinal waves and shear waves which is easier than that obtained from tensile testing.
In this paper, we employ the ultrasonic flaw detector to evaluate material properties using the amplitude spectrum method. The material constants of thin solid layer, the viscosity of thin liquid layer and the stability of viscosity in liquid are investigated in detail. Through measurements of viscosity changing with temperature or concentration, the relationships between viscosity and temperature as well as viscosity and concentration are established. In addition, the measurements of viscosity of human blood can provide us the information of preliminary estimation for diagnosis. The other research interest indicated in this paper is the measurements during solidification in adhesives. We measure wave velocities and viscosities of adhesives to determine the condition of the layer separations. According to our results, we can estimate the tolerance of adhesive in the bonded joints by analyzing the size and quantity of adhesive.
Subjects
超音波
黏度
振幅
波速
頻譜
薄層液體
薄層固體
frequency spectrum
wave velocity
amplititude
ultrasound
thin liquid layer
viscosity
thin solid layer
Type
thesis
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