Dynamic acousto-elastic test using continuous probe wave and transient vibration to investigate material nonlinearity
This study demonstrates the feasibility of the dynamic acousto-elastic effect of a continuous high frequency wave for investigating the material nonlinearity upon transient vibration. The approach is demonstrated on a concrete sample measuring 15 15 60 cm3 . Two ultrasonic transducers (emitter and r...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/77675 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/77675 |
| Access Level: | acceso abierto |
| Palabra clave: | Slow dynamics Fast dynamics Nonlinear wave modulation Nonlinear acoustic Dynamic acousto-elastic test INGENIERIA DE LA CONSTRUCCION |
| Sumario: | This study demonstrates the feasibility of the dynamic acousto-elastic effect of a continuous high frequency wave for investigating the material nonlinearity upon transient vibration. The approach is demonstrated on a concrete sample measuring 15 15 60 cm3 . Two ultrasonic transducers (emitter and receiver) are placed at its middle span. A continuous high frequency wave of 500 kHz propagates through the material and is modulated with a hammer blow. The position of the hammer blow on the sample is configured to promote the first bending mode of vibration. The use of a continuous wave allows discrete time extraction of the nonlinear behavior by a short-time Fourier transform approach, through the simultaneous comparison of a reference non-modulated signal and an impact-modulated signal. The hammer blow results in phase shifts and variations of signal amplitude between reference and perturbed signals, which are driven by the resonant frequency of the sample. Finally, a comprehensive analysis of the relaxation mechanisms (modulus and attenuation recovery) is conducted to untangle the coupled fast and slow hysteretic effects. 2016 Elsevier B.V. All rights reserved. |
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