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  • 151.
    Ziethén, Rune
    et al.
    SP – Sveriges Provnings- och Forskningsinstitut.
    Bengtsson, Charlotte
    SP – Sveriges Provnings- och Forskningsinstitut.
    Non-destructive test technique based on resonant vibrations - Application on Wood-Based Panels. Nordtest project no. 1487-002002Report (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.

  • 152.
    Ågårdh, Lennart
    SP – Sveriges Provnings- och Forskningsinstitut.
    5th Meeting of the European Laboratories Modal Analysis Group in Porto1995Report (Refereed)
  • 153.
    Ågårdh, Lennart
    SP – Sveriges Provnings- och Forskningsinstitut.
    Tillståndsbedömning av betongbroar genom mätning och beräkning av dynamisk respons1995Report (Refereed)
  • 154.
    Ögren, Mikael
    SP – Sveriges Provnings- och Forskningsinstitut.
    Turbulence and finite scrrens. Environmental noise 20001998Report (Refereed)
  • 155.
    Örnemark, Ulf
    SP – Sveriges Provnings- och Forskningsinstitut.
    Evaluation of a model for participation in proficiency testing schemes proposed in Nordtest project 1421-981999Report (Refereed)
  • 156.
    Örnemark, Ulf
    SP – Sveriges Provnings- och Forskningsinstitut.
    Metrology in chemistry - Enquiry concerning the current situation and future needs in Sweden conducted for the Regular Committee of the SMT-programme.1998Report (Refereed)
  • 157.
    Örnemark, Ulf
    SP – Sveriges Provnings- och Forskningsinstitut.
    Provning av vidhäftning hos keramiska våtrumskonstruktioner efter olika härdningsbetingelser1999Report (Refereed)
  • 158.
    Örnemark, Ulf
    SP – Sveriges Provnings- och Forskningsinstitut.
    Sammanställning av resultat från svenska deltagare i provningsjämförelsen IMEP-91999Report (Refereed)
  • 159.
    Örnemark, Ulf
    SP – Sveriges Provnings- och Forskningsinstitut.
    TQM på laboratoriet - introduktion till kvalitetssäkring av kemiska mätningar2000Report (Refereed)
  • 160.
    Östman, Birgit
    SP – Sveriges Provnings- och Forskningsinstitut.
    National fire regulations in relation to the use of wood in European and some other countries 2002; Trätek publikation 02120442002Report (Refereed)
  • 161.
    Östman, Birgit
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Jarnerö, Kirsi
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Sjökvist, Lars-Göran
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Larsson, Krister
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Akustik (Eta).
    Tillberg, Karl
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Akustik (Eta).
    Acoustics in wooden buildings. State of the art 20082008Report (Refereed)
  • 162.
    Östman, Birgit
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Mikkola, Esko
    European classes for the reaction to fire performance of wood products (except floorings)2004Report (Refereed)
1234 151 - 162 of 162
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