Tensile creep and recovery of Norway spruce influenced by temperature and moisture
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Emil Tang Engelund
und
Lennart Salmén
Abstract
The time-dependent mechanical behaviour (TDMB) of wood is important when using the material for structural purposes. Recently, a new method for predicting the TDMB by numerical modelling was established based on the assumption that TDMB is caused by the sliding of the microfibrils past each other. In this study, the TDMB is examined via creep experiments on small specimens of Norway spruce latewood. The results of these are compared with results from numerical modelling. The experiments include results at two levels of moisture content and three levels of temperature, enabling an investigation of these two climatic factors on TDMB of wood. It was found that the mechanical response of wood tissue is the sum of responses from both tracheids and middle lamella, with only the previous being reversible. The effect of moisture and temperature differed in that the latter affected the elastic and time-dependent responses equally. Moisture, on the other hand, reduced both the elastic properties and the activation energy barrier for sliding of the microfibrils, but furthermore changed the microfibril angle of the sample as a result of swelling. Hereby, moisture had a larger effect on the time-dependent response than the elastic. All of these effects were predicted by numerical modelling.
©2012 by Walter de Gruyter Berlin Boston
Artikel in diesem Heft
- Masthead
- Masthead
- Original Papers
- Proposed supramolecular structure of lignin in softwood tracheid compound middle lamella regions
- Degradation products of lignocellulosics in pulp mill effluents – comparison and evaluation of different gas chromatographic techniques for a comprehensive analysis
- Analysis of DCM extractable components from hot-pressed hybrid poplar
- Pretreatment of softwood dissolving pulp with ionic liquids
- Probing the chemical and surface chemical modification of vessel cell walls during bleaching of eucalyptus pulp
- Chemotaxonomical identification of Holocenic bogwood recovered after 2007 Niigataken Chuestsu-oki Earthquake
- Tensile creep and recovery of Norway spruce influenced by temperature and moisture
- Solvent-free chemical modification of wood by acetic and butyric anhydride with iodine as catalyst
- Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples
- Effects of polymeric matrix on accelerated UV weathering properties of wood-plastic composites
- Nano- and microstructures in stretched and non-stretched blend gels of cellulose and hemicelluloses
- Dimensional and hygroexpansive behaviors of cellulose microfibrils (MFs) from kraft pulp-based fibers as a function of relative humidity
- Effect of quat- and amino-silicones on fungal colonisation and decay of wood
- Copper precipitation of Cu-monoethanolamine preservative in wood
- Short Note
- Mode II critical stress intensity factor of wood measured by the asymmetric four-point bending test of single-edge-notched specimen while considering an additional crack length
- Erratum
- Treating birch wood with a switchable 1,8-diazabicyclo-[5.4.0]-undec-7-ene-glycerol carbonate ionic liquid
- Meetings
- Meetings
Artikel in diesem Heft
- Masthead
- Masthead
- Original Papers
- Proposed supramolecular structure of lignin in softwood tracheid compound middle lamella regions
- Degradation products of lignocellulosics in pulp mill effluents – comparison and evaluation of different gas chromatographic techniques for a comprehensive analysis
- Analysis of DCM extractable components from hot-pressed hybrid poplar
- Pretreatment of softwood dissolving pulp with ionic liquids
- Probing the chemical and surface chemical modification of vessel cell walls during bleaching of eucalyptus pulp
- Chemotaxonomical identification of Holocenic bogwood recovered after 2007 Niigataken Chuestsu-oki Earthquake
- Tensile creep and recovery of Norway spruce influenced by temperature and moisture
- Solvent-free chemical modification of wood by acetic and butyric anhydride with iodine as catalyst
- Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples
- Effects of polymeric matrix on accelerated UV weathering properties of wood-plastic composites
- Nano- and microstructures in stretched and non-stretched blend gels of cellulose and hemicelluloses
- Dimensional and hygroexpansive behaviors of cellulose microfibrils (MFs) from kraft pulp-based fibers as a function of relative humidity
- Effect of quat- and amino-silicones on fungal colonisation and decay of wood
- Copper precipitation of Cu-monoethanolamine preservative in wood
- Short Note
- Mode II critical stress intensity factor of wood measured by the asymmetric four-point bending test of single-edge-notched specimen while considering an additional crack length
- Erratum
- Treating birch wood with a switchable 1,8-diazabicyclo-[5.4.0]-undec-7-ene-glycerol carbonate ionic liquid
- Meetings
- Meetings
