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Non-destructive test technique based on resonant vibrations - Application on Wood-Based Panels. Nordtest project no. 1487-00
SP – Sveriges Provnings- och Forskningsinstitut.
SP – Sveriges Provnings- och Forskningsinstitut.
2002 (English)Report (Refereed)
Abstract [en]

In the European production control standard for wood based panels, EN 326-2, there is an opportunity to use alternative test procedures. To find efficient test procedures which reduce the control costs in terms of destructed material and man efforts is an important task. One technique regarded as possible to use is based on measurements of resonant vibrations. The method is already accepted for grading of structural timber. For wood based panels there is a need not only to determine the strength and stiffness in the plane of the panels but also to determine the inter-nal bond. The objective of this project was to investigate the potential of using resonant vi-brations as an alternative test procedure for whole panels. The approach was to examine if there is a correlation between resonant vibrations on whole panels and mechanical properties, determined according to the EN-standards. Both axial and flexural vibrations were studied. For flexural vibration it was necessary to treat the results to be able to find a resonant flexural frequency in the noise. The results from the project show that the correlation between dynamic MOE and bending properties is better for panels than for solid wood. The dynamic MOE is, however, not suitable for predicting the bending properties for one single panel type with a small range in MOE or bending strength. The damping was very weakly correlated both to the bending properties and to the internal bond. The internal bond was also weakly correlated to the resonant frequencies. Based on these results, resonant vibrations do not seem to be an alternative to destructive testing without further developments. The technique may, however, have a poten-tial to be used as a control tool in the production line. The correlations are proba-bly strong enough to display the mean value and trends of the bending properties during a certain time of production.

Place, publisher, year, edition, pages
2002. , 33 p.
Series
SP Rapport, ISSN 0284-5172 ; 2002:10
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-4590Local ID: 11315OAI: oai:DiVA.org:ri-4590DiVA: diva2:962228
Available from: 2016-09-07 Created: 2016-09-07Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
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  • Other locale
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Output format
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