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| Determination Method of Mode and Excitation frequency on Acoustoelastic Effect of Guided Waves in Bar |
| LIU Fei1, WU Bin2, HE Cun-fu2, Zhao Man-quan1,Yu Zhi-hong1 |
| 1. College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Huhhot 010018；2. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124 |
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Abstract It has potential advantages that stress level of the waveguide structure is measured based on acoustoelastic effect of ultrasonic guided wave. In order to optimal selection mode and excitation frequency of acoutoelastic stress testing, the Murnaghan hyperelastic model finite element eigenfrequency method is presented. The dispersion characteristic of prestressed bar is calculated using this approach, acoustoelastic dispersion is obtained for stress sensitivity，and the results are consistent comparing with the literature. On this basis, selecting the mode and excitation frequency, acoustoelastic effect of L(0,1) mode is experimented for Q235 carbon steel bar in the homemade tensile test platform. The results show that: the errors are terrible in low stress region, it can be controlled no more than 10% in high stress region, and the tendency is uniform comparing with theory result for acoutoelastic constants. This study proposes a method that can provide a determination method of mode and excitation frequency for stress measurement using acoustoelastic effect of ultrasonic guided wave.
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Received: 20 August 2013
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2015, Vol. 34 
