THE EVALUATION OF NONLINEARITY OF ALUMINUM HOLLOW CYLINDER USING NONLINEAR ULTRASONIC WAVES

摘要：

This paper develops an experimental method for evaluating micro-damages of a metal pipe structure using nonlinear ultrasonic guided waves. The material nonlinearity of undamaged and thermal damaged ahuminum pipe specimens is measured. Flexible PVDF transducers are used to generate and receive the fundamental and cumulative second harmonic guided waves. The weak amplitude of the second harmonic wave is extracted from the FFT spectrum of a received signal. The measured acoustic relative nonlinear parameter increases monotoncally as a function of the propagation distance, and the slope becomes greater after the specimen being subjected to heat-loading. These results indicate that nonlinear ultrasonic guided waves can be used to assess the nonlinearity of a pipe, and the relative nonlinear parameter is a potential candidate for the diagnostics and life prediction of a pipe-like structure.

作者: Bin Yang Weibin Li Younho Cho Joonhyun Lee

作者单位: School of Mechanical Engineering,Pusan National University,Busan,Korea

会议类型: 国际会议

会议名称: The 3rd World Conference on Safety of Oil and Gas Industry(第三届世界石油天然气工业安全会议 WCOGI 2010)

会议地点: 北京

会议语种:英文

页码: 505-508

在线出版日期: 2010-09-27（万方平台首次上网日期，不代表论文的发表时间）