Propagation Behaviors of ASF modes Propagating Along Wedge Tips with Defects

• Main Authors: Yu-Hong Chen, 陳語鋐
• Other Authors: 楊哲化
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/ng7xy4

碩士 === 國立臺北科技大學 === 機電整合研究所 === 98 === Wedge wave is a kind of elastic wave propagat along the tip of wedges. Its energy is concentrated on the range of about one wavelength of tip. A combined experimental / numerical investigation employing a laser ultrasound technique and finite element analysis is used to characterize the propagation behaviors of ASF modes propagating along wedge tips with defects. More specifically, reflection coefficient and transmission coefficients are modeled and measured for several of defect depths on the wedge tip. Good agreement is obtained between the modeled and measured reflection and transmission coefficients. And this study discovers wedge wave has mode conversion phenomenon similar to Lamb wave.