Abstract
The crosswise bonding of the layers in laminated solid wood panels results in internal stresses when the humidity varies. The layers hinder one another as a result of the anisotropy of wood. The purpose of this study was to determine the internal stress state in free and constrained swelling. The expansion properties in the three panel directions were measured. Furthermore, the swelling of samples was constrained while the resulting forces were recorded. Hygroscopic warping experiments were carried out inducing a climate gradient within the panels. Afterwards the stresses were calculated from released deformations and non-destructive measurements of the Young’s modulus. The materials used were untreated and heat-treated beech wood, the latter modified in two levels. In addition to homogenously structured panels, treated top layers were combined with an untreated middle layer. Swelling, swelling pressure, warping and internal stresses considerably decreased from untreated to treated wood. If layers from treated and untreated material were combined, stresses and deformations increased as compared to the variants produced only from treated wood. It was concluded that the lower equilibrium moisture content of heat-treated beech wood improves its dimensional stability, which results in smaller deformation differences between the layers. Hence, the stresses were less distinctive.
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References
Bader H, Niemz P, Sonderegger W (2007) Investigation on the influence of the panel composition on selected properties of three-layer solid wood panels. Holz Roh Werkst 65:173–181
Bekhta P, Niemz P (2003) Effect of high temperature on the change in color, dimensional stability and mechanical properties of spruce wood. Holzforschung 57:539–546
Bucur V (1995) Acoustics of wood. CRC Press, Boca Raton, USA
Bucur V, Archer RR (1984) Elastic-constants for wood by an ultrasonic method. Wood Sci Technol 18:255–265
Burmester A (1973) Effect of heat-pressure-treatments of semi-dry wood on its dimensional stability. Holz Roh Werkst 31:237–243
Czaderski C, Steiger R, Howald M, Olia S, Gülzow A, Niemz P (2007) Tests and calculations on 3-layered cross-laminated solid wood panels supported at all edges. Holz Roh Werkst 65:383–402
Dahlblom O, Persson K, Petersson H, Ormarsson S (1999) Investigation of variation of engineering properties of spruce. In: Proceedings of the 6th international IUFRO wood drying conference: wood drying research and technology for sustainable forestry beyond 2000, University of Stellenbosch, South Africa
DIN 52186 (1978) Testing of wood; bending test. DIN German Institute for Standardization
DIN 52184 (1979) Testing of wood; determination of swelling and shrinkage. DIN German Institute for Standardization
Donzé M, Niemz P, Hurst A (2003) Research of multi-layer solid wood panels properties. Wood Res-Slovakia 48:27–36
Frangi A, Bochicchio G (2007) Brandverhalten von Brettsperrholzplatten. In: Proceedings of the 39. Fortbildungskurs SAH: Praktische Anwendung von Massivholzplatten, Weinfelden, Switzerland, November 7–8
Ganev S, Cloutier A, Gendron G, Beauregard R (2005) Finite element modeling of the hygroscopic warping of medium density fiberboard. Wood Fiber Sci 37:337–354
Giebeler E (1983) Dimensional stabilization of wood by moisture-heat-pressure-treatment. Holz Roh Werkst 41:87–94
Gülzow A, Gsell D, Steiger R (2007) Non-destructive evaluation of elastic parameters of square-shaped cross-laminated solid wood panels, built up symmetrically with 3 layers. Holz Roh Werkst 66(1):19–37
Jensen U, Kehr E (1995) Gegenüberstellung des Stehvermögens von MDF, Spanplatten und OSB. Holz-Zent, bl 121:1614–1616
Jönsson J, Svensson S (2004) A contact free measuring method to determine internal stress states in glulam. Holzforschung 58:148–153
Kollmann F, Schneider A (1963) On the sorption behaviour of heat stabilized wood. Holz Roh Werkst 21:77–85
Krug D, Tobisch S, Faust E (1999a) Massivholzplatten für konstruktive Anwendungen. Teil 1. Holz-Zent bl 94:1282–1283
Krug D, Tobisch S, Faust E (1999b) Massivholzplatten für konstruktive Anwendungen. Teil 2. Holz-Zent bl 100:1335–1336
Militz H, Hill C (2005) Wood Modification: Processes, Properties and Commercilisation. In: Proceedings of the 2nd European conference on wood modification ECWM, Göttingen, Germany, October 6–7
Möhler K, Herröder W (1979) The range of the coefficient of friction of spruce wood rough from sawing. Holz Roh Werkst 37:27–32
Niemz P (1993) Physik des Holzes und der Holzwerkstoffe. DRW-Verlag, Leinfelden-Echterdingen
Niemz P, Bencat J (2001) Tests zu mechanischen Eigenschaften mehrschichtiger Massivholzplatten. Holzforsch Holzverw 3:58–60
Popper R, Niemz P, Eberle G (2004a) Diffusion processes in multilayer solid wood panels. Holz Roh Werkst 62:253–260
Popper R, Niemz P, Eberle G (2004b) Equilibrium moisture content and swelling of the solid wood panels. Holz Roh Werkst 62:209–217
Popper R, Niemz P, Eberle G (2005) Investigations on the sorption and swelling properties of thermally treated wood. Holz Roh Werkst 63:135–148
Schwab E, Steffen A, Korte C (1997) In-plane swelling and shrinkage of wood-based panels. Holz Roh Werkst 55:227–233
Sell J (1997) Eigenschaften und Kenngrössen von Holzarten. Baufachverlag AG, Dietikon
Sigrist C, Howald M, Niemz P (2007) Verbindungen und Verbindungsmittel an Brettsperrholz. Proceedings of the 39. Fortbildungskurs SAH: Praktische Anwendung von Massivholzplatten, Weinfelden, Switzerland, Nov 7–8
Tobisch S (2006) Methoden zur Beeinflussung ausgewählter Eigenschaften von dreilagigen Massivholzplatten aus Nadelholz. Dissertation, University of Hamburg
Tobisch S, Krug D (2001) Massivholzplatten für konstruktive Anwendungen: Einfluss des Plattenaufbaus und anderer Parameter auf die Festigkeitseigenschaften dreilagiger Massivholzplatten. Holz-Zent bl 127:1328–1329
Tobisch S, Plattes D (2000) Eigenschaften dreischichtiger Massivholzplatten. Holz-Zent bl 85:1148–1150
Uibel T (2007) Bemessung stiftförmiger Verbindungsmittel in Brettsperrholz. Proceedings of the 39. Fortbildungskurs SAH: Praktische Anwendung von Massivholzplatten, Weinfelden, Switzerland, Novmber 7–8
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This study was supported by the Swiss forest and wood research fund (Schweizerischer Fonds zur Föderung der Wald- und Holzforschung).
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Gereke, T., Schnider, T., Hurst, A. et al. Identification of moisture-induced stresses in cross-laminated wood panels from beech wood (Fagus sylvatica L.). Wood Sci Technol 43, 301–315 (2009). https://doi.org/10.1007/s00226-008-0218-1
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DOI: https://doi.org/10.1007/s00226-008-0218-1