Wood tensile strength at temperatures and moisture contents simulating fire conditions

Östman, Birgit

doi:10.1007/bf00353071

Cited by 54 publications

(26 citation statements)

References 6 publications

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“…This is in accordance with several of the previous studies cited above 5, 8, 11, 13. It is well known that increasing the moisture content has negative effects on solid wood tensile properties 24, 25. Most probably, filler particles in WPCs absorbing water exhibit similar tendencies.…”

Section: Resultssupporting

confidence: 92%

Polypropylene‐based wood polymer composites—Effect of a maleated polypropylene coupling agent under dry and wet conditions

Sobczak

Lang

Reif

et al. 2013

J of Applied Polymer Sci

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Polypropylene (PP)-based wood polymer composites with 40 and 60 m % wood content, respectively, have been prepared, employing two different wood types and 0.0-20.0% (based on wood content) of a maleated polypropylene (MA-PP) coupling agent (CA). The main objective of this research was to find out if the optimum CA content is dependent on wood filler particle size. Tensile and flexural properties, as well as impact strength, heat deflection temperature, and water absorption served as indicator properties for the CA influence. For all properties, there is an optimum or the onset of a plateau occurring between 8.0 and 13.0 m % MA-PP content. Flexural properties were determined after 28 days of water submersion as well, for both wet and redried specimens, revealing that the mechanical properties can be restored to a large extent in sufficiently coupled compounds. A dependence of the MA-PP content optimum on particle size was not detected.

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Section: Resultssupporting

confidence: 92%

Polypropylene‐based wood polymer composites—Effect of a maleated polypropylene coupling agent under dry and wet conditions

Sobczak

Lang

Reif

et al. 2013

J of Applied Polymer Sci

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show abstract

“…In addition, moisture-dependent wood strength, above all the tensile strength in the R and T directions, remain widely unknown for most wood species. The available data are limited to a few references [4,[8][9][10]. Since tensile stress perpendicular to the grain represents the weakest timber point [11][12][13], its knowledge, especially with regard to the load capacity and failure prediction of wooden structures, is of great importance.…”

Section: Introductionmentioning

confidence: 99%

Moisture-dependent elastic and strength anisotropy of European beech wood in tension

2012

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While the general mechanical behaviour of wood is known, its moisture-dependent elastic and strength anisotropy remains little studied. Given the anisotropic and hygroscopic nature of wood, a characterisation of wood mechanical behaviour will require knowledge of its moisture-dependent properties in relation to the three principal axes of anisotropy. The present study examines the influence of the moisture content (MC) on the elastic and strength anisotropy of beech wood (Fagus sylvatica L.). Selected elastic and strength parameters, including the anisotropic Young's moduli, Poisson's ratios, yield and ultimate stress values and the fracture toughness in the TR, TL, RT and RL directions, are determined in uniaxial tension and compact tension tests at different moisture conditions. A distinct moisture dependency is shown for the elastic and strength behaviour of beech wood. With the exception of some Poisson's ratios, all investigated elastic and strength parameters are shown to decrease with increasing MC. The two-and three-dimensional representation of the compliance matrix, and the two-dimensional visualisation of a yield surface, provides a valuable overview on the moisture-dependent elastic and strength anisotropy of beech wood.

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“…Although these results are important and show some insightful meaning, due to the unavoidable alteration of these components during extraction or preparation, their applicability to intact, unadulterated wood is questionable. Recognizing the limitation of those methods, several researchers directly investigated the thermal softening behavior of solid wood specimens at various moisture contents (Ö stman 1985;Blechschmidt et al 1986; Brought to you by | Universitaet Giessen Authenticated Download Date | 5/25/15 5:07 PM and Kamke 2001; Wolcott and Shutler 2003). Recognizing the limitation of those methods, several researchers directly investigated the thermal softening behavior of solid wood specimens at various moisture contents (Ö stman 1985;Blechschmidt et al 1986; Brought to you by | Universitaet Giessen Authenticated Download Date | 5/25/15 5:07 PM and Kamke 2001; Wolcott and Shutler 2003).…”

Section: Theoretical Backgrounds Materials and Methodsmentioning

confidence: 99%

Characterizing hydro-thermal compression behavior of aspen wood strands

Zhou¹,

Smith²,

Dai³

2009

HFSG

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This study evaluates the microscopic changes of paulownia solid wood panels subjected to thermal compression via characterizing the changes in wood microstructure. The panels, with dimensions of 500 mm × 100 mm × 20 mm, were hot-pressed in a tangential direction by using a laboratory-type hot press at a temperature of either 150 °C or 170 °C and a pressure of 2 MPa for 45 min. Microscopic investigations conducted by light microscopy showed that slightly more damage occurred in the samples compressed at 170 °C and 2 MPa than at 150 °C and 2 MPa, and that the distribution of deformation in the panels was not uniform in the growth rings of the two treatment groups. The cell collapse was not observed in the microstructure of paulownia wood after the thermal compression. Cell shapes and their arrangement in the growth ring alongside loading direction were interpreted as effective factors governing the non-uniform distribution of damage and the lack of cell collapse in the microstructure.

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Wood tensile strength at temperatures and moisture contents simulating fire conditions

Cited by 54 publications

References 6 publications

Polypropylene‐based wood polymer composites—Effect of a maleated polypropylene coupling agent under dry and wet conditions

Polypropylene‐based wood polymer composites—Effect of a maleated polypropylene coupling agent under dry and wet conditions

Moisture-dependent elastic and strength anisotropy of European beech wood in tension

Characterizing hydro-thermal compression behavior of aspen wood strands

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