Ultrasonic Inspection of The Contact Interfaces Between Two Metal Components

• Main Authors: Yu-Hung Su, 蘇裕弘
• Other Authors: Shiuh-Chuan Her
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/70343777492266715831

碩士 === 元智大學 === 機械工程學系 === 95 === Ultrasonic is one of the most widely used techniqe for non destructive evaluation of interfaces .In this investigation , the ultrasonic method is employed to evaluate the contact interfaces between a layer and two metal components under compressive load .The quality of the contact interface is described in terms of the interfacial stiffness. The reflected waves from the interface are transformed to frequency domain by Fast Fourier Transform (FFT), and deconvolved with a reference signal taken from the interface with zero pressure. The interfacial stiffness are calculated from the frequency spectrum of the reflected waves. The effects of the contact pressure , surface roughness , and layer thickness on the interfacial stiffness are through a parametric study