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| Improved linear elastic model of discontinuous displacement and dynamic measurement of interface elastic modulus |
| WANG Guanshi1，2，LIU Shanquan2，HU Shili2，LONG Ping2 |
| (1. Institute of Engineering and Research，Jiangxi University of Science and Technology，Ganzhou，Jiangxi 341000，China；2. School of Architectural and Surveying and Mapping Engineering，Jiangxi University of Science and Technology，Ganzhou，Jiangxi 341000，China ) |
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Abstract The propagation process of stress wave across the macro interfaces with larger thickness is difficult to be described using the linear elastic model of discontinuous displacement. The linear elastic model of discontinuous displacement was improved by adopting the multistage Taylor expansion of displacement component and stress component on the side of interface transmission. The elastic modulus of the interface was calculated using the customary and improved models respectively. The effect of impedance ratio and interface thickness on the test error was analyzed. The elastic modulus of the interface should be measured using the customary model based on the waveform difference of transmission wave when the impedance ratio was larger. The effect of interface thickness on the test deviation was analyzed using the vibration waveform of measuring points through numerical calculation. The test deviation，based on the reflection waveform difference adopting the improved model，decreased with the increase of the interface thickness. However，the test deviation based on the transmission waveform difference adopting the customary model increased with the increase of the interface thickness. The results of the field test and the numerical simulation were consistent with each other.
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2016, Vol. 35 
