Defective Analysis of Metal Material Using Ultrasonic technology

• Main Author: 李尉任
• Other Authors: 陳茂林
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/92311389214996357126

碩士 === 建國科技大學 === 自動化工程系暨機電光系統研究所 === 100 === We know that when the ultrasonic wave transmission in solid material, the attenuation of ultrasonic energy can cause a number of factors. Generally considered medium viscosity, thermal conductivity, organizational structure (for example, the anisotropy of the metal, the crystal structure of the inhomogeneity, grain size and chemical composition, microstructure, segregation, micro-defects, etc.) are closely contact. Overall, however, the spread of the ultrasonic attenuation coefficient is an integrated α. In addition, in the ultrasonic inspection, the chip area of probe, and frequency differences caused by different beam spread angle of the spread of attenuation. Therefore, analyzed the attenuation of ultrasonic energy are very complex. How to use the ultrasonic attenuation characteristics of non-destructive testing of materials are very significant issues. In this paper, ultrasonic for the material defect evaluate and ultrasonic characteristics of the relationship, seek to enhance detection capabilities to determine the optimal conditions, and changes directly to the speed of ultrasonic to evaluate the size defect.