Damage identification in concrete using impact non-linear reverberation spectroscopy |
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| Affiliation: | 1. Department of Mathematical Statistics, Lund University, Sweden;2. Division of Engineering Geology, Lund University, Sweden;1. Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA;2. Área de Ingenierías, Instituto Tecnológico de Santo Domingo (INTEC), Santo Domingo, 10602, RD, Dominican Republic;3. Department of Bridge Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;4. Department of Mechanical Engineering, Rice University, Houston, TX 77005, USA;5. State Key Lab for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;1. School of Mechanical Engineering, Yangtze University, Jingzhou, Hubei Province 434023, China;2. Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA |
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| Abstract: | High amplitude non-linear acoustic methods have shown potential for the identification of micro damage in brittle materials such as concrete. Commonly, these methods evaluate a non-linearity parameter from the relative change in frequency and attenuation with strain amplitude. Here, a novel attenuation model is introduced to describe the free reverberation from a standard impact resonance frequency test, together with an algorithm for estimating the unknown model coefficients. The non-linear variation can hereby by analyzed over a wider dynamic range as compared to conventional methods. The experimental measurement is simple and fully compatible with the standardized free-free linear impact frequency test. |
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| Keywords: | Non-destructive testing Impact method Reverberation spectroscopy |
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