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Fernández Llana, Daniel and Iñiguez Gonzalez, Guillermo and Arriaga Martitegui, Francisco and Sanabria Martin, Sergio Jose and Niemz, Peter (2013). Experimental and numerical investigation of effect of sawn timber dimensions in ultrasonic velocity measurements of Spanish softwoods. In: "Proceedings 18th International Nondestructive Testing and Evaluation of Wood Symposium. Madison, Wisconsin, USA 2013", 24/09/2013 - 27/09/2013, Madison, Wisconsin, Estados Unidos de América. p. 710.
Title: | Experimental and numerical investigation of effect of sawn timber dimensions in ultrasonic velocity measurements of Spanish softwoods |
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Author/s: |
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Item Type: | Presentation at Congress or Conference (Poster) |
Event Title: | Proceedings 18th International Nondestructive Testing and Evaluation of Wood Symposium. Madison, Wisconsin, USA 2013 |
Event Dates: | 24/09/2013 - 27/09/2013 |
Event Location: | Madison, Wisconsin, Estados Unidos de América |
Title of Book: | Proceedings 18th International Nondestructive Testing and Evaluation of Wood Symposium |
Date: | 2013 |
Subjects: | |
Faculty: | E.T.S.I. Montes (UPM) |
Department: | Construcción y Vías Rurales [hasta 2014] |
Creative Commons Licenses: | Recognition - No derivative works - Non commercial |
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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 menor que2?L distance, the fitted sound speed values increased by 15% between the two tested frequencies.
Item ID: | 22941 |
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DC Identifier: | https://oa.upm.es/22941/ |
OAI Identifier: | oai:oa.upm.es:22941 |
Deposited by: | Memoria Investigacion |
Deposited on: | 25 Mar 2014 11:15 |
Last Modified: | 21 Apr 2016 20:55 |