Ponencias en congresos:
Experimental and numerical investigation of effect of sawn timber dimensions in ultrasonic velocity measurements of Spanish softwoods
Experimental and numerical investigation of effect of sawn timber dimensions in ultrasonic velocity measurements of Spanish softwoods
Año:2013
Áreas de investigación
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Ingenieria civil, -
Construccion de edificios,
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Rehabilitacion de edificios
Datos
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Descripción
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| Ultrasonic sound velocity measurements with hand-held equipment remain due to their simplicity among the most used methods for non-destructive grading of sawn woods, yet a dedicated normalization effort with respect to strength classes for Spanish species is still required. As part of an ongoing project with the aim of definition of standard testing methods, the effect of the dimensions of commonly tested Scots pine (Pinus sylvestris L.) timbers and equipment testing frequency on ultrasonic velocity were investigated. A dedicated full-wave finite-difference time-domain software allowed simulation of pulse propagation through timbers of representative length and section combinations. Sound velocity measurements vL were performed along the grain with the indirect method at 22 kHz and 45 kHz for grids of measurement points at specific distances. For sample sections larger than the cross-sectional wavelength ?RT, the simulated sound velocity vL converges to vL = (CL/?)0.5. For smaller square sections the sound velocity drops down to vL = (EL/?)0.5, where CL, EL and ? are the stiffness, E-modul and density, respectively. The experiments confirm a linear regression between time of flight and measurement distance even at less than two wavelength <2?L distance, the fitted sound speed values increased by 15% between the two tested frequencies. | |
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Internacional
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Si |
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Nombre congreso
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18th International Nondestructive Testing and Evaluation of Wood Symposium |
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Tipo de participación
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960 |
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Lugar del congreso
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Madison, Wisconsin, Estados Unidos de América |
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Revisores
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ISBN o ISSN
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00-0000-000-0 |
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DOI
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Fecha inicio congreso
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24/09/2013 |
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Fecha fin congreso
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27/09/2013 |
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Desde la página
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710 |
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Hasta la página
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710 |
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Título de las actas
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Proceedings 18th International Nondestructive Testing and Evaluation of Wood Symposium. Madison, Wisconsin, USA 2013 |
Ver publicación en Archivo digital upm
Participantes
- Autor: Daniel Fernandez Llana (UPM)
- Autor: Sergio Jose Sanabria Martin (Wood Physics, ETH Zurich, Switzerland)
- Autor: Guillermo Iñiguez Gonzalez (UPM)
- Autor: Francisco Arriaga Martitegui (UPM)
- Autor: Peter Niemz (Wood Physics, ETH Zurich, Switzerland)
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