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Mechanical properties of wood examined by semi-destructive devices

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Abstract

This study presents a comparative evaluation of semi-destructive and destructive testing of wood. Semi-destructive methods are represented by screw-withdrawal test, microdrilling, pin penetration and a new construction of a diagnostic device for in situ evaluation of timber based on the principle of measuring the mechanical resistance to pin being pushed gradually into wood. In order to ascertain the differences between the methods, measuring of three basic softwood species was conducted. One of the aims was to capture the variability of properties brought about by the distribution of properties along the diameter and along the trunk (section) length; therefore, an entire trunk of spruce, fir and pine were used for testing. The accuracy of the prediction of mechanical properties provided by the semi-destructive devices was verified using correlations with mechanical properties established by standard pressure tests in compliance with European norms. The results show a very good correlation of the mean force necessary to push the pin in the timber with wood density and strength in compression along the grain found in standard specimens.

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Acknowledgments

This paper was created with a financial support from grant project DF11P01OVV001 “Diagnostics of damage and life span of Cultural Heritage buildings”, NAKI program, provided by the Ministry of Culture and institutional support RVO 68378297.

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Authors and Affiliations

  1. Centre of Excellence ARCchip Telč, Institute of Theoretical and Applied Mechanics, v. v. i., Academy of Sciences of Czech Republic, Prauge, Czech Republic

    Michal Kloiber

  2. Department of Wood Science, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic

    Jan Tippner

  3. Department of Mechanical Wood Technology, Faculty of Wood Sciences and Technology, Technical University in Zvolen, Zvolen, Slovak Republic

    Jaroslav Hrivnák

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  1. Michal Kloiber
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  2. Jan Tippner
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  3. Jaroslav Hrivnák
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Correspondence to Michal Kloiber.

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Kloiber, M., Tippner, J. & Hrivnák, J. Mechanical properties of wood examined by semi-destructive devices. Mater Struct 47, 199–212 (2014). https://doi.org/10.1617/s11527-013-0055-z

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